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IoT application uses MQTT, an application layer protocol that facilitates machine-to-machine communication using a central entity called broker. The vulnerability lies in the broker being susceptible to intrusion attempts, where a potential attacker might engage in a Distributed Denial of Service attack. Such an attack involves repetitively transmitting large number of malicious messages or counterfeit connect requests. To send large messages, the attackers must breach the authentication process of MQTT. MQTT employs two authentication approaches to safeguard its system: certificate-based and credential-based authentication. Credential-based authentication is popular as it is easy to implement. However, in MQTT, credential-based authentication is vulnerable to various attacks as credentials are transmitted in plain-text form. In literature, authors have explored different cryptography-based solutions to address these challenges. However, implementing these solutions in IoT systems is impractical due to the substantial computational requirements at the broker and the end devices. The primary objective of this work centres around formulating a PUF-based authentication policy and designing an IDS to track the behaviour of incoming traffic. In the proposed authentication scheme, the PUF mechanisms generate credentials to establish authenticity, thus protecting the network from password-based vulnerabilities like dictionary-based attacks. The second security module of this research implements a Machine Learning based IDS system to track and block fake connect requests in real-time. The proposed IDS system comprises Decision Tree and Neural Network algorithms that operate in parallel. In order to maintain the lightweight nature of the ML model, the system incorporates a feature selection technique. The result section shows that the proposed system effectively and efficiently recognizes fake connect requests in real-time and consumes minimal energy. Additionally, the proposed scheme requires less time than existing schemes in the literature. [ABSTRACT FROM AUTHOR]

In the contemporary technology context, several physical things may be used to support human activities. The Internet of Things is a cutting-edge technology solution that is used to link physical items with the digital world via a range of networks as well as communication technologies. The Internet of Things benefits from the smart settings in which mobile ad hoc networks (MANET) operate, making it more appealing to users and financially viable. Wireless sensors with MANETs may be integrated using the Internet of Things to develop new MANET-IoT devices and IT-based networks. Such a strategy lowers network deployment costs while increasing user mobility. That does, however, also bring up fresh, challenging issues about networking concerns. We introduced a new DAG-Blockchain architecture for MANET-IoT security in this study. The Multi-Factor PUF identification technique protects the network. Network topology is separated into clusters with all allowed nodes. We introduced the Secure Trust-based Dijikstra's Method with numerous criteria for secure data transfer. We presented a Bi-Directional GRU for deep packet analysis. Deep packet inspection is used to identify intrusions, which are then blocked by a blocking mechanism. The suggested method achieved increased efficiency in the packet delivery ratio, productivity, time analysis, detection accuracy, and security level using the combination of algorithms. The numerical findings from the simulation and analysis of the proposed DAG-IDS in the WSN-IoT network reveal significant improvements across various performance metrics. Specifically, the DAG-IDS demonstrates enhanced network lifetime, achieving up to 220 cycles compared to 100 cycles in the BLOCKCHAIN method. The analysis also highlights superior packet delivery ratios (PDR) exceeding 90%, reduced delays, and efficient throughput, showcasing the effectiveness of the proposed approach in optimizing the network's quality of service, energy efficiency, and security. [ABSTRACT FROM AUTHOR]

Recently, low Earth orbit (LEO) satellites have emerged as key players in space information network (SIN) due to their ability to provide global coverage. However, they remain susceptible to threats such as denial of service (DoS), man-in-the-middle (MITM), and spoofing attacks. In this paper, we propose a cross-layer security framework (CLSF) to address these vulnerabilities. Our approach begins by employing a physically unclonable function (PUF) at the upper layer to establish mutual authentication between legitimate satellites and ground stations, while also securely exchanging frequency seeds for the next phase. Following this, dynamic seed frequency hopping (DSFH) is applied at the physical layer to counter DoS, MITM, and spoofing attacks. Additionally, the frequency transitions of malicious satellites are modeled using a Markov chain. Our results demonstrate that the proposed CLSF, which integrates PUF and DSFH, delivers strong security performance. [ABSTRACT FROM AUTHOR]

The Internet of Medical Things (IoMT) provides such flexibility in our society where anyone can get medical treatment at any time, from anywhere. IoMT is a type of network where different resource-constraint physiological sensors are deployed in and/or on the human body that connects with the internet through the Gateway node, for monitoring purposes. However, due to the open nature of communication in the IoMT; the security, and privacy of patients' sensed data is very challenging, and that needs to be addressed, because any modification or alteration to it may lead to putting the life of a patient in danger. In this context, Chunka et al. proposed an authentication and key agreement (AKA) scheme for IoMT and claimed that the scheme has many security features and is easy to deploy. Unfortunately, it came to notice during this research that the scheme is vulnerable to multiple attacks, including replay, insider, smart card loss, eavesdropping, and server spoofing attacks, additionally failing to establish the session key agreement. So to overcome this issue, an efficient and improved multi-factor lightweight mutual AKA scheme is proposed through this article by incorporating a PUF-enabled sensor node and smart card for the users. To prove the superiority of the proposed schemes and to demonstrate the security features, the scheme is verified by formal security proof using the ROR model and informal proof using the AVISPA tool kit. In the end, a comprehensive analysis covering security, performance, and a comparative evaluation with existing similar approaches along with the Chunka et al. scheme demonstrates that the suggested approach not only achieves a higher level of protection against commonly recognized threats but also maintains an economically efficient mechanism concerning sensor nodes. [ABSTRACT FROM AUTHOR]

Edge computing has become quintessential in commercial, healthcare, and industrial applications. It enables real-time data processing at the edge device, thus reducing the data traffic to the cloud and increasing the processing time efficiency. As an edge device, modern System-on-Chips (SoCs) provide scalability, security, and development in an integrated platform. Intellectual Property (IP) core reuse is a boon in SoCs that bridges the gap between integrated circuit design and fabrication. Such edge devices modeled by vendors are bound to ensure high security to avoid piracy. The proposed architecture provides a two-step authentication utilizing a Finite State Machine (FSM) with a secured key obtained from the newly structured Physical Unclonable Function (PUF) within the same edge device, with the primary goal of verifying several heterogeneous IPs to achieve the least power and energy. Two PUF designs, Anderson Arbiter PUF (AA-PUF) and Balanced AA-PUF, have been proposed for two different placements taking advantage of SoC-based architecture. The PUF characteristics have been experimentally validated with and without majority voting and demonstrate their proximity close to the desired value in ZedBoard. The proposed design is a strong PUF with less than 15% area overhead and power dissipation of 1.982 W for a 64-bit response. The experimental validation has evaluated that the power and energy consumptions are 2.56 W and 2.17 J for 52 heterogeneous IPs. [ABSTRACT FROM AUTHOR]

Crowdfunding refers to the online collection of certain capital from a vast number of individuals or groups that each contribute a relatively small amount. Recently, the credibility of crowdfunding platforms has been undermined by fraudulent projects, inadequate fund management, and other forms of disorder. The decentralization and anti-tampering features of blockchain provide the possibility to solve the above problems, and many studies have proposed blockchain-based crowdfunding schemes. However, the existing state-of-the-art methods do not provide user authentication, transaction auditing, and identity management in a privacy-preserving way. Accordingly, this paper presents a novel blockchain-based crowdfunding system called CrowdChain. Initially, the distributed identity and BLS signature are employed to establish a user authentication mechanism, enabling CrowdChain to withstand Sybil attacks while preserving the non-linkability of user identities. Secondly, the physically unclonable function (PUF) is used to generate keys associated with digital identities that are not stored in external devices to resist physical attacks. Subsequently, a crowdfunding mechanism is constructed utilizing zero-knowledge proofs to facilitate streamlined auditing procedures while safeguarding the confidentiality of transactions. Additionally, the formal security analysis proves the security of the CrowdChain scheme. The system prototype is implemented on the Hyperledger Fabric. Empirical evidence indicates the viable efficiency of CrowdChain. [ABSTRACT FROM AUTHOR]

The communication of Industrial Internet of Things (IIoT) devices faces important security and privacy challenges. With the rapid increase in the number of devices, it is difficult for traditional security mechanisms to balance performance and security. Although schemes based on encryption and authentication exist, there are still difficulties in achieving lightweight security. In this paper, an authentication and key exchange scheme combining hardware security features and modern encryption technology is proposed for the MQTT-SN protocol, which is not considered security. The scheme uses Physical Unclonable Functions (PUFs) to generate unpredictable responses, and combines random numbers, time stamps, and shared keys to achieve two-way authentication and secure communication between devices and broker, effectively preventing network threats such as replay and man-in-the-middle attacks. Through verification, the proposed scheme has proved effective in terms of security and robustness, has computational and communication cost advantages compared with recent schemes, and provides higher availability. [ABSTRACT FROM AUTHOR]

With the rapid advancement of information technology, the security of digital libraries, as critical platforms for modern knowledge dissemination, has become increasingly significant. User identity authentication in digital libraries is pivotal to ensuring system security. Traditional authentication methods often have security vulnerabilities and cannot effectively prevent unauthorized access. Therefore, this paper proposes a security authentication scheme based on chebyshev chaotic mapping for library. It addresses security issues in identity authentication in digital libraries. The proposed scheme integrates smart card, password and biometric factor, leveraging the chebyshev chaotic mapping algorithm to achieve stringent user authentication and generate secure session keys, thereby effectively countering security threats. Additionally, the scheme employs physical unclonable function (PUF) to enhance the protection of stored confidential data. The security of this scheme is rigorously analyzed using the Scyther. Security analysis and performance experiments indicate that the scheme not only ensures security but also optimizes authentication efficiency.

Abstract Recently, low Earth orbit (LEO) satellites have emerged as key players in space information network (SIN) due to their ability to provide global coverage. However, they remain susceptible to threats such as denial of service (DoS), man-in-the-middle (MITM), and spoofing attacks. In this paper, we propose a cross-layer security framework (CLSF) to address these vulnerabilities. Our approach begins by employing a physically unclonable function (PUF) at the upper layer to establish mutual authentication between legitimate satellites and ground stations, while also securely exchanging frequency seeds for the next phase. Following this, dynamic seed frequency hopping (DSFH) is applied at the physical layer to counter DoS, MITM, and spoofing attacks. Additionally, the frequency transitions of malicious satellites are modeled using a Markov chain. Our results demonstrate that the proposed CLSF, which integrates PUF and DSFH, delivers strong security performance.

New self‐healing resin composites with tertiary amine microcapsules enhance the mechanical performance of dental restorations. However, a higher concentration of dibenzoyl peroxide (BPO) must be added to the composite to react with the core material when the microcapsules rupture, reducing the shelf life of dental materials due to their reactivity. As a result, one approach to reducing the amount of BPO dissolved in dental resin is to microencapsulate it. Thus, this manuscript described the encapsulation of BPO in poly(urea‐formaldehyde) (PUF) microcapsules (MC) and investigated its effect on the flexural strength of BisGMA/TEGDMA composites. To synthesize hollow MC, poly(acrylic acid) (PAA) was tested as a continuous phase viscosity modifier. The MC were then infiltrated with BPO dissolved in linseed oil as core materials. PAA in continuous phase increased MC diameter due to improved air bubble stability. BPO dissolved in linseed oil was successfully infiltrated into empty PUF MC, causing the MC shell wall to expand. The dental resin had adequate adhesion to the PUF shell, which ruptured under induced stress. Thus, the MC filled with BPO as a healing agent has the potential to reduce the amount of BPO that is typically dissolved in the monomeric phase of dental materials, which can increase the shelf life of self‐healing dental materials. Highlights: The reactivity of dibenzoyl peroxide (BPO) affects resin stability in dental materials.When combined with tertiary amines, BPO acts as a healing agent in self‐healing composite materials.BPO dissolved in linseed oil can be infiltrated in PUF microcapsules and increase its size.Hollow microcapsules synthesized in a more viscous continuous phase have a larger diameter.Microencapsulated BPO is released during stress stimuli in dental resin. [ABSTRACT FROM AUTHOR]

The intelligent grid environment is an electricity transmission and distribution system utilizing information and communication technology with two main components: the Smart Meter (SM) and the Service Provider (SP). Unfortunately, wireless mode communication allows the attacker to get data from the public channels and then alter, delete the data, and perform a severe attack such as DoS, impersonation, and tracking attack. In addition, the smart meter is vulnerable to cloning attacks. This research proposes a new authentication protocol utilizing Biometrics and Physical Unclonable Function (PUF). Intuitive analysis DY model ensures our protocol successfully attains security properties and withstands well-known attacks; formal analysis using mathematical and programming models such as Mao-and-Boyd Logic, Real-or-Random Model, and Scyther tools prove that our protocol also satisfies security features and resists well-known attacks. Subsequently, computational complexity comparisons are carried out to prove that our proposal has a low computational burden.

Internet of Things (IoT) technology is evolving over the peak of smart infrastructure with the participation of IoT devices in a wide range of applications. Traditional IoT authentication methods are vulnerable to threats due to wireless data transmission. However, IoT devices are resource- and energy-constrained, so building lightweight security that provides stronger authentication is essential. This paper proposes a novel, two-layered multi-factor authentication (2L-MFA) framework using blockchain to enhance IoT devices and user security. The first level of authentication is for IoT devices, one that considers secret keys, geographical location, and physically unclonable function (PUF). Proof-of-authentication (PoAh) and elliptic curve Diffie–Hellman are followed for lightweight and low latency support. Second-level authentication for IoT users, which are sub-categorized into four levels, each defined by specific factors such as identity, password, and biometrics. The first level involves a matrix-based password; the second level utilizes the elliptic curve digital signature algorithm (ECDSA); and levels 3 and 4 are secured with iris and finger vein, providing comprehensive and robust authentication. We deployed fuzzy logic to validate the authentication and make the system more robust. The 2L-MFA model significantly improves performance, reducing registration, login, and authentication times by up to 25%, 50%, and 25%, respectively, facilitating quicker cloud access post-authentication and enhancing overall efficiency. [ABSTRACT FROM AUTHOR]

The rapid development of Internet of Things (IoT) technology has led to increased attention to its potential applications in agriculture. IoT-based agricultural applications are able to better monitor crops and make informed decisions about resource allocation. Ensuring data reliability is a significant challenge in agricultural IoT environments. The reliability of collected data is subject to situational characteristics of IoT devices, such as their location, which can be easily compromised by environmental and human factors. To address this issue, location-based device authentication has been proposed as a means of ensuring data reliability. Currently, Physical Unclonable Function (PUF) is also widely used in IoT authentication mechanisms. In this paper, we propose a lightweight two-factor continuous authentication protocol based on PUF and location. The proposed protocol leverages the properties of PUF to resist physical attacks, uses simple cryptographic operations such as XORs and hash functions to ensure security, and reduces resource consumption through continuous authentication. A formal security analysis of the proposed scheme is performed using Burrows–Abadi–Needham (BAN) logic analysis. The informal security analysis of the proposed scheme demonstrates that it is resistant to several known attacks. Additionally, we further evaluate the performance of the proposed scheme. The results demonstrate that the proposed scheme has low communication and computational costs, and offers better security and functionality attributes. [ABSTRACT FROM AUTHOR]

The medical cyber-physical system utilizes various Internet of Medical Things (IoMT) devices that are connected to the network for real-time management and medication of patient. The resource constraint IoMT devices require energy-efficient lightweight security schemes to protect medical data. To the best of our knowledge, majority of the existing studies concentrate either on security or on energy efficiency issues. The main contribution of this research is to develop an energy-efficient lightweight authentication method without sacrificing the security level. The authentication is done using multiple factors, namely password, physical unclonable function (PUF), Chebyshev polynomial, smartcard and fuzzy extractor. Chebyshev polynomial is used for non-identification of the private key by any attacker, whereas PUF protects the smart card from cloning by generating unique challenge–response pairs. Apart from authentication, the proposed scheme includes Blockchain-enabled distributed trustable ecosystem among independent participants where miner is selected using lightweight fuzzy system. The proposed scheme carries out the formal security analysis using real or random model which is perseverance against different external attacks and the security verification has been done using AVISPA (Automate Validation of Internet Security Protocols and Applications) tool. As a major finding, the simulation result using NS-3 simulator confirms that the proposed study outperforms the existing studies in terms of packet loss rate, throughput, end-to-end delay, computational cost and communication cost. [ABSTRACT FROM AUTHOR]

Legitimate identification of devices is crucial to ensure the security of present and future IoT ecosystems. In this regard, AI-based systems that exploit intrinsic hardware variations have gained notable relevance. Within this context, on-chip sensors included for monitoring purposes in a wide range of SoCs remain almost unexplored, despite their potential as a valuable source of both information and variability. In this work, we introduce and release a dataset comprising data collected from the on-chip temperature and voltage sensors of 20 microcontroller-based boards from the STM32L family. These boards were stimulated with five different algorithms, as workloads to elicit diverse responses. The dataset consists of five acquisitions (1.3 billion readouts) that are spaced over time and were obtained under different configurations using an automated platform. The raw dataset is publicly available, along with metadata and scripts developed to generate pre-processed T–V sequence sets. Finally, a proof of concept consisting of training a simple model is presented to demonstrate the feasibility of the identification system based on these data. Dataset: https://doi.org/10.5281/zenodo.10042177. Dataset License: The dataset is available under CC-BY 4.0 licence [ABSTRACT FROM AUTHOR]

In this rapidly advancing era, technology has been progressing extensively and swiftly. As a result, the emergence of numerous Cyber-Physical Systems (CPS) has become imperative to meet the technological demands of modern life. However, these systems generate a substantial amount of data, which poses challenges in terms of management, storage, and susceptibility to external attacks. This paper primarily focuses on the performance and security aspects of CPS, particularly in countering external threats, through the integration of blockchain technology and machine learning. It provides a comprehensive review of recent research findings that demonstrate the use of blockchain to enhance CPS performance while ensuring robust security. Furthermore, the paper explores the synergistic application of blockchain and machine learning techniques to reinforce CPS security. Moreover, it investigates how the combination of blockchain with physically unclonable functions (PUF) can significantly enhance the efficacy of physical device authentication. [ABSTRACT FROM AUTHOR]

Summary: The Internet of Vehicles (IoV) has potentially escalated the management of vehicle and route planning. However, as the IoV becomes more prevalent, safeguarding the privacy and security of IoV data becomes crucial. Additionally, because vehicles often operate with minimal human interference, they become susceptible to various types of attacks that can compromise their privacy and security. In this article, we propose a three‐factor authentication system based on CROPUF (Crossover Ring Oscillator Physically Unclonable Function) that not only secures transmissions but also ensures safety against physical intervention. The three‐factor authentication protocol (passwords, biometrics, and PUF) avoids registering any confidential information in the user device eliminating the possibility of intrusion by an intruder. We also propose the use of aggregators (charging stations that act as mediators between the IoV and the data center) as a fog layer communication which will reduce load and improve the efficiency of communication between vehicles and the data center. Finally, the security analysis validates that our proposed method can survive several well‐known assaults and achieve the required features of security by maintaining the user anonymity. [ABSTRACT FROM AUTHOR]

Given the current maturity of printed technologies, Organic Thin-Film Transistors (OTFT) still show high initial variability, which can be beneficial for its exploitation in security applications. In this work, the process-related variability and aging of commercial OTFTs have been characterized to evaluate the feasibility of OTFTs-based Physical Unclonable Functions (PUFs) implementation. For our devices, ID-based PUFs show good uniformity and uniqueness. However, PUFs' reliability could be compromised because of the observed transient and aging effects in the OTFTs, which could hinder the reproducibility of the generated fingerprints. A systematic study of the aging of OTFTs has been performed to evaluate the PUFs' reliability. Our results suggest that the observed transient and aging effects could be mitigated so that the OTFTs-based PUFs' reliability could be improved. [ABSTRACT FROM AUTHOR]

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The Internet of Things (IoT) revolutionizes connectivity, as IoT devices grow exponentially, vulnerabilities emerge, ranging from data breaches to device hijacking. Thus there is the critical need for robust security measures, including encryption protocols and authentication mechanisms, to safeguard against cyber threats. Despite advancements in the authentication mechanism, still IoT security remains an ongoing concern. Because most of the authentications are vulnerable to diverse security attacks and other resource intensive. Thus protecting user data in this increasingly interconnected IoT-enabled world requires a secure and lightweight authentication mechanism. In this direction, in this paper, we propose a physically secure authentication framework for the IoT (PSAF-IoT). PSAF-IoT utilizes a combination of physical unclonable functions, secure hash algorithm, and elliptic curve cryptography to establish robust security measures. It guarantees the creation of a secure channel (session key) following user authentication at the gateway node, allowing the user to use the established secure channel for future communication. The secure channel establishment procedure is validated for security by employing formal methods such as the random oracle model and Scyther-based simulations. Additionally, PSAF-IoT undergoes informal validation to demonstrate resilience against node capture, replay attacks, impersonation, and other common security threats. Notably, PSAF-IoT demonstrates efficiency in terms of execution time, energy consumption, and communication costs, as evidenced by comparative analyses with related authentication frameworks, all while enhancing information security functionalities.

Smart Parking Systems have emerged as a transformative solution to address the growing challenges associated with urbanization and increasing vehicular traffic. Such system integrates sensors, cameras, and other IoT connected devices to monitor parking spaces in real time. However, there are many security vulnerabilities in existing solutions, especially when it comes to car authentication at parking entry points. IoT sensors my be susceptible to Cyber-attacks and fraudulent activities, such as car theft, can exploit these vulnerabilities due to limited built-in security features. The reliability of authentication systems, based on IoT sensors can also be compromised by factors such as extreme weather conditions and physical damage. The cyber-physical solution we propose relies on Physical Unclonable Functions (PUFs) for identification and authentication in IoT devices to mitigate these challenges. The use of PUFs enhances the reliability and security of smart parking systems against unauthorized access and fraud. Furthermore, to ensure the integrity and confidentiality of the data within the smart parking ecosystem and to improve authentication process, we propose the implementation of a tailored blockchain framework. This framework incorporates lightweight local blockchains dedicated to individual parking slots, complemented by a central blockchain that manages data at the city level. The experimental results demonstrate the feasibility of the PUF computation process, showcasing an acceptable runtime for practical implementation. In the experimental results, we evaluated the SRAM used for the PUF implementation process and demonstrated its stability (intra HD equals to 2.25.

In Internet of Vehicles (IoV), the secure data transmission between vehicles and transportation infrastructure effectively ensures the safety and fast driving of vehicles, while authentication and key agreement protocols between vehicles and transportation infrastructure (V2I) play an important role in ensuring data security and user privacy. However, how to design a provably secure and lightweight V2I authentication protocol for IoV is a challenge. Recently, Kumar et al. proposed a conditional privacy-preserving and desynchronization-resistant authentication protocol for IoV, but we find that Kumar et al.'s scheme is vulnerable to identity guessing attacks, impersonation attacks, and a lack of session key secrecy once the attacker obtains data stored in smart card through side-channel attacks. We also point out that Kumar et al.'s protocol is vulnerable to Roadside Unit (RSU) captured attacks and lacks perfect forward secrecy. Therefore, we propose an improved V2I authentication protocol for IoV, which uses the Physical Unclonable Function (PUF) to resist RSU captured attacks, and designed a three-factor secrecy strategy to resist side-channel attacks; a conditional privacy-preserving strategy was also adopted to achieve anonymity and malicious user tracking. Furthermore, the proposed protocol is provably secure under the random oracle model and has low computation and communication costs. [ABSTRACT FROM AUTHOR]

Different physical objects can be employed in the modern technological environment to facilitate human activity. In order to connect physical objects with the universe of digital using a variety of networks and communication technologies, an IoT, the cutting edges technological and effective solution, is deployed. Mobile ad hoc networks (MANET) interact with the IoTin smart settings, enhancing its user appeal and boosting its commercial viability. The new system of MANET based IoT and IT-network may be created by integrating wireless sensor and MANET with the Internet of Things. A solution like this increases user mobility while lowering network deployment costs. However, it also raises new, difficult problems in terms of networking considerations. In this, we presented a novel DAG (Directed Acyclic Graph)-Blockchain structure for MANET-IoT security. The network is secured through Multi-Factor PUF (MF-PUF) authentication scheme. With all authorized nodes, the network is segregated into cluster topology. For trusted data transmission, we proposed Jelly Fish Optimization (JFO) algorithm with the consideration of multiple criteria. For deep packet inspection, we proposed a Fully Connected Recurrent Neural Network (FCRNN). Through deep packet inspection, the intrusions are detected and mitigated through blocking system.With help of merged algorithm, the suggested method obtained improved ability in the PDR (Packet Delivery Ratio), production, analysis of time, detection accuracy also security levels. The comparison results clearly indicate that the proposed study outperforms all previous studies in various aspects. Particularly, the suggested methods for cluster creation, data aggregation, routing, encryption, and authentication significantly improve the system of DAG-IDS. Additionally, the planned task exhibits an exceptionally low standard deviation, making the suggested approach highly suitable for a WSN-IoT environment. [ABSTRACT FROM AUTHOR]

The spectrum of Internet of Things (IoT) applications is vast. It serves in various domains such as smart homes, intelligent buildings, health care, emergency response, and many more, reflecting the exponential market penetration of the IoT. Various security threats have been made to modern-day systems. Cyberattacks have seen a marked surge in frequency, particularly in recent times. The growing concern centers around the notable rise in cloning attacks, persisting as a significant and looming threat. In our work, an in-depth survey on the IoT that employs physically unclonable functions (PUFs) was conducted. The first contribution analyzes PUF-based authentication, communication protocols, and applications. It also tackles the eleven challenges faced by the research community, proposes solutions to these challenges, and highlights cloning attacks. The second contribution suggests the implementation of a framework model known as PUF3S-ML, specifically crafted for PUF authentication in the Internet of Things (IoT), incorporating innovative lightweight encryption techniques. It focuses on safeguarding smart IoT networks from cloning attacks. The key innovation framework comprises three stages of PUF authentication with IoT devices and an intelligent cybersecurity monitoring unit for IoT networks. In the methodology of this study, a survey relevant to the concerns was conducted. More data were provided previously regarding architecture, enabling technologies, and IoT challenges. After conducting an extensive survey of 125 papers, our analysis revealed 23 papers directly relevant to our domain. Furthermore, within this subset, we identified 11 studies specifically addressing the intersection of communication protocols with PUFs. These findings highlight the targeted relevance and potential contributions of the existing literature to our research focus. [ABSTRACT FROM AUTHOR]

Wireless Medical Sensor Network (WMSN) is a kind of Ad-hoc Network that is used in the health sector to continuously monitor patients’ health conditions and provide instant medical services, over a distance. This network facilitates the transmission of real-time patient data, sensed by resource-constrained biosensors, to the end user through an open communication channel. Thus, any modification or alteration in such sensed physiological data leads to the wrong diagnosis which may put the life of the patient in danger. Therefore, among many challenges in WMSN, the security is most essential requirement that needs to be addressed. Hence, to maintain the security and privacy of sensitive medical data, this article proposed a lightweight mutual authentication and key agreement (AKA) scheme using Physical Unclonable Functions (PUFs) enabled sensor nodes. Moreover, to make the WMSN more secure and reliable, the physiological data like the electrocardiogram (ECG) of the patients are also considered. In order to establish its accuracy and security, the scheme undergoes validation through the Real or Random (RoR) Model and is further confirmed through simulation using the Automated Validation of Internet Security Protocols and Applications (AVISPA) tool. A thorough examination encompassing security, performance, and a comparative assessment with existing related schemes illustrates that the proposed scheme not only exhibits superior resistance to well-known attacks in comparison to others but also upholds a cost-effective strategy at the sensor node, specifically, a reduction of 35.71% in computational cost and 49.12% in communication cost. [ABSTRACT FROM AUTHOR]

In the Internet-of-Things (IoT) or blockchain-based network systems, secure keys may be stored in individual devices; thus, individual devices should protect data by performing secure operations on the data transmitted and received over networks. Typically, secure functions, such as a physical unclonable function (PUF) and fully homomorphic encryption (FHE), are useful for generating safe keys and distributing data in a network. However, to provide these functions in embedded devices for IoT or blockchain systems, proper inspection is required for designing and implementing embedded system-on-chip (SoC) modules through overhead and performance analysis. In this paper, a virtual platform (SoC VP) was developed that includes a secure key generation module with a PUF and FHE. The SoC VP platform was implemented using SystemC, which enables the execution and verification of various aspects of the secure key generation module at the electronic system level and analyzes the system-level execution time, memory footprint, and performance, such as randomness and uniqueness. We experimentally verified the secure key generation module, and estimated the execution of the PUF key and FHE encryption based on the unit time of each module. [ABSTRACT FROM AUTHOR]

Over the last decade, technological advances in smart grids have permitted the modernization of legacy electricity networks. As Internet of Things (IoT)-based smart grids are becoming an efficient response to managing changing electric demand, the heterogeneous network of equipment required to make these Cyber-Physical Systems a reality poses some security threats. This paper proposes a novel mutual authentication and key agreement scheme to ensure communications security and protect users' privacy in smart grid applications. In the proposed scheme (named EPSG), an elliptic curve cryptography (ECC) module and a physical unclonable function (PUF) are used simultaneously to provide acceptable confidentiality and integrity levels. The security analysis demonstrates that the EPSG has a robust security posture regarding transferred messages on the communication channel and physical attacks. In addition, EPSG is resistant to modeling attacks as one of the main vulnerabilities of PUF modules. Furthermore, by implementing the EPSG on an Arduino UNO microcontroller, a comparative performance evaluation (e.g., Time 156 ms, Communication cost 1408 bits, and Energy consumption 13.728 mJ) demonstrates the efficiency of the proposed EPSG. [ABSTRACT FROM AUTHOR]

This paper presents a novel reconfigurable SRAM CRP PUF that can achieve high reliability and randomness. In conventional reconfigurable SRAM CRP PUFs, imprecise timing control can produce a biased response output, which is typically attributed to mismatches in the connection of input control signals to the two inverter arrays in the layout floorplan. We propose a timing control scheme along with the addition of an adjunct NMOS transistor to address this issue. This eliminates the connection mismatches for the challenge and word-line inputs to the two inverter arrays. Furthermore, we employ symmetric layout techniques to achieve the randomness of response output. The symmetric arrangement of the two inverter arrays maximizes the inherent random output characteristics derived from process variation. The pre-charge input signal is symmetrically connected to each array to prevent delay mismatches. A 16 × 9-bit reconfigurable PUF array is fabricated by using a 180 nm CMOS process, with a PUF cell area of 1.2 × 10 4 F 2 /bit. The experimental results demonstrate an inter Hamming distance of 0.4949 across 40 chips and an intra Hamming distance of 0.0167 for a single chip in 5000 trials. The measured worst bit error rate (BER) is 4.86% at the nominal point (1.8 V, 25 °C). The proposed prototype exhibits good reliability and randomness, as well as a small silicon area when compared to the conventional SRAM CRP PUFs. [ABSTRACT FROM AUTHOR]

Security vulnerabilities associated with Internet of Medical Things (IoMT) may lead to health disasters. The researchers already have designed several lightweight authentication techniques to provide secure communication towards physical layer security in a heterogeneous IoMT environment. Blockchain technology is utilized to solve the existing security issues of IoMT ensuring the network layer security. This paper presents a lightweight two factor authentication scheme (TFAS) for a blockchain-enabled IoMT environment which focuses on both the physical and network layer security without involvement of any centralized third party. The proposed TFAS involves device, user and data authentication along with user authorization for improved access control of medical data. It is a two-phase authenticity verification method which involves the authentication of users and devices using the PUF and fuzzy extractor in the first phase and blockchain-based data authentication along with authorization of users in the second phase. It also improves storage capacity of blockchain-enabled IoMT network and ensures its scalability using a cluster of smart-contract enabled inter planetary file systems servers. The formal security analysis has been performed using the real-or-random model for evaluating security of session key and mutual authentication protocol. The informal security analysis provides strong evidences for resilience of TFAS from various known attacks. Moreover, the proposed scheme outperformed other existing schemes in terms of communication cost, computational cost and storage. [ABSTRACT FROM AUTHOR]

Physical Unclonable Functions (PUFs) are significant hardware primitives that use physical variations in the manufacturing process to build unclonable keys. They exploit the process variations (PVs) in transistors across the Integrated Circuits (ICs) that generate a unique signature for each chip for identification and authentication. In this article, a novel Recursive Challenge Feed Arbiter Physical Unclonable Function (RC-FAPUF) is proposed to generate unique, unpredictable, and reliable keys which are independent of the challenges that are generally fed by the user. Subsequently, the uncertainty in the prediction of the key increases while performing the security breach on IoT-enabled access systems like smartcards. The proposed design has a significant advantage in the feed-forward arbitration mechanism to generate reliable keys against PVs. Moreover, the robustness of the keys is measured by reliability is achieved as 99.91% when performed over a temperature that ranges from −40°C to +125°C and 99.23% with ±10% variations in supply voltage. The proposed RC-FAPUF is implemented in a 180 nm CMOS process and the responses regarding PVs are validated through a prediction analysis of 48% with Linear Regression (LR) against security attacks. It is confirmed that a significant improvement over previous works is witnessed with our design. [ABSTRACT FROM AUTHOR]

In recent days, cryptographic algorithm hardware is the need of IoT devices. However, limited resources demand an efficient approach towards designing the said cryptographic algorithm hardware. This paper introduces the PUF (Physical Unclonable Function) based approach to design the key generator used in cryptographic algorithm hardware to minimize the area and power consumption. A customizable key generation unit has been introduced in the form of a Standard Synchronization Unit (SSU) to match the desired key size requirements. The results were generated with PUF based designs from literature and compared with the proposed PDL (Programmable Delay Logic) PUF. All parameters considered, a proposed PDL PUF key generator is an efficient option that can be integrated with an Advanced Encryption System (AES) as the key generator. The modified AES design result was compared with the literature's results on the Xilinx Virtex XC7VX690T platform. The modified AES is an efficient solution with 12.10% less area consumption and a 44.51% increase in throughput. [ABSTRACT FROM AUTHOR]

Abstract In smart cities, communication and information exchange for the Internet of Vehicles rely on open and closed infrastructures along the roadside. Secure communications rely on the sender and receiver devices having self-sustaining authentication methods. The perquisites of the authentication methods are to grip communication without being falsified by an adversary or unidentified third parties. This article introduces the Service-Categorized Security Scheme (SCSS) with a physically unclonable function (PUF) for handling sensitive guidance/communication information. The vehicle-side authentication, access control, and service demands are governed using service-based PUF factors such as digital signatures, passwords, etc. To prevent anonymous third parties and adversaries, the PUF operates over compromised and uncompromised communication devices. Device-specific keys generated by PUFs based on intrinsic physical variances help identify between compromised and uncompromised devices, while keys generated by uncompromised devices conform to their expected profiles In the service-sharing process, mutual authentication using synchronized keys is used for security and service verification. The synchronized keys are integrated with the PUF for monitoring de-synchronization and individual operation. This decision is made using federated learning from the external service provider and the communicator of the vehicle. Through the learning process, a de-synchronization occurrence at the service provider and vehicle is identified as the reason for disconnecting the session. As a result, any suspicious activity that contradicts service security is identified, and the information of the communicating vehicle is secured. The proposed scheme is analyzed using the metrics authentication time, adversary detection ratio, complexity, de-synchronization time, and successful sessions.

The communication of Industrial Internet of Things (IIoT) devices faces important security and privacy challenges. With the rapid increase in the number of devices, it is difficult for traditional security mechanisms to balance performance and security. Although schemes based on encryption and authentication exist, there are still difficulties in achieving lightweight security. In this paper, an authentication and key exchange scheme combining hardware security features and modern encryption technology is proposed for the MQTT-SN protocol, which is not considered security. The scheme uses Physical Unclonable Functions (PUFs) to generate unpredictable responses, and combines random numbers, time stamps, and shared keys to achieve two-way authentication and secure communication between devices and broker, effectively preventing network threats such as replay and man-in-the-middle attacks. Through verification, the proposed scheme has proved effective in terms of security and robustness, has computational and communication cost advantages compared with recent schemes, and provides higher availability.

Due to the limited payload and power of drones, the computational overhead, storage overhead and communication overhead that can be used for secure communication are restricted, making it difficult to apply some complex but fairly secure authentication protocols on drones. In this paper, we propose a low-complexity protocol for storing identity information in a resource-unconstrained device that does not require the UAV to store the information, thereby enhancing the UAV’s resistance to capture. The protocol in this paper mainly consists of quasi-cyclic low-density parity-check (QC-LDPC) codes, physical unclonable functions (PUFs) based on random-access memory (RAM), “XOR” operations, and hash computation. The protocol in this paper is an authentication architecture in which the drone is guided by the ground station to read its identity information, and the drone does not store any identity information in advance. The protocol is divided into two phases: 1. fuzzy authentication of fingerprint PUF and 2. uniqueness authentication accomplished while guiding the recovery of identity PUF. Recovering identity PUF in this paper, QC-LDPC is used as the error control module, and the optimization of bit-flip decoding significantly reduces the probability of decoding failure. After the comparative security analysis and comparative overhead analysis of this paper’s protocol, it can be concluded that this paper’s protocol can withstand common attacks (including attacks attempting to pass authentication, attacks attempting to interfere with authentication, and physical capture attacks), and the storage and communication overhead is small in the case of large time overhead.