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1,046 results on '"Ullah, Ikram"'

8. Mosaic Loss of the Y Chromosome Is Enriched in Patients With Wild-Type Transthyretin Cardiac Amyloidosis and Associated With Increased Mortality

Author

Thel, Mark C., Cochran, Jesse D., Teruya, Sergio, Hayashi, Ou, Xie, Christopher R., Srinivasan, Ajay R., Chavkin, Nicholas W., Arai, Yohei, Sano, Soichi, Mirabal Santos, Alfonsina, De Los Santos, Jeffeny, Fine, Denise, Sabogal, Natalia, Ullah, Ikram, Helmke, Stephen, Rodriguez, Carlos, Prokaeva, Tatiana, Foster, Rachel H., Spencer, Brian H., Izumiya, Yasuhiro, Maurer, Mathew S., Walsh, Kenneth, and Ruberg, Frederick L.

Published
2024
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10. Applying Machine Learning on RSRP-based Features for False Base Station Detection

Author

Nakarmi, Prajwol Kumar, Sternby, Jakob, and Ullah, Ikram

Subjects
Computer Science - Cryptography and Security
Abstract

False base stations -- IMSI catchers, Stingrays -- are devices that impersonate legitimate base stations, as a part of malicious activities like unauthorized surveillance or communication sabotage. Detecting them on the network side using 3GPP standardized measurement reports is a promising technique. While applying predetermined detection rules works well when an attacker operates a false base station with an illegitimate Physical Cell Identifiers (PCI), the detection will produce false negatives when a more resourceful attacker operates the false base station with one of the legitimate PCIs obtained by scanning the neighborhood first. In this paper, we show how Machine Learning (ML) can be applied to alleviate such false negatives. We demonstrate our approach by conducting experiments in a simulation setup using the ns-3 LTE module. We propose three robust ML features (COL, DIST, XY) based on Reference Signal Received Power (RSRP) contained in measurement reports and cell locations. We evaluate four ML models (Regression Clustering, Anomaly Detection Forest, Autoencoder, and RCGAN) and show that several of them have a high precision in detection even when the false base station is using a legitimate PCI. In our experiments with a layout of 12 cells, where one cell acts as a moving false cell, between 75-95\% of the false positions are detected by the best model at a cost of 0.5\% false positives., Comment: 9 pages,5 figure, 3 tables, 2 algorithms

Published
2022
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11. Beyond the exome: utility of long-read whole genome sequencing in exome-negative autosomal recessive diseases

Author

AlAbdi, Lama, Shamseldin, Hanan E., Khouj, Ebtissal, Helaby, Rana, Aljamal, Bayan, Alqahtani, Mashael, Almulhim, Aisha, Hamid, Halima, Hashem, Mais O., Abdulwahab, Firdous, Abouyousef, Omar, Jaafar, Amal, Alshidi, Tarfa, Al-Owain, Mohammed, Alhashem, Amal, Al Tala, Saeed, Khan, Arif O., Mardawi, Elham, Alkuraya, Hisham, Faqeih, Eissa, Afqi, Manal, Alkhalifi, Salwa, Rahbeeni, Zuhair, Hagos, Samya T., Al-Ahmadi, Wijdan, Nadeef, Seba, Maddirevula, Sateesh, Khabar, Khalid S. A., Putra, Alexander, Angelov, Angel, Park, Changsook, Reyes-Ramos, Ana M., Umer, Husen, Ullah, Ikram, Driguez, Patrick, Fukasawa, Yoshinori, Cheung, Ming Sin, Gallouzi, Imed Eddine, and Alkuraya, Fowzan S.

Published
2023
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17. Electrochemical Techniques for the Detection of Heavy Metals

Author

Ur Rehman, Afrasiab, primary, Hakim Shah, Abdul, additional, Ur Rahman, Atta, additional, Ur Rahman, Fida, additional, Ali, Sher, additional, Ur Rehman, Atta, additional, Ullah, Raza, additional, Ullah, Ikram, additional, Fayaz, Muhammad, additional, and Shi, Keying, additional

Published
2023
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18. Lest to Blame Students: The Role of Enforcers in Promoting Academic Dishonesty

Author

Ullah, Ikram

Abstract

Academic frauds, dishonesty and cheating are pervasive in Pakistan, but thus far less systematic research has been undertaken on the effectiveness of the policies designed for countering academic dishonesty. Generally, the success of a policy depends on a good design and appropriate implementation. The design aspect of the policies to counter academic dishonesty in Pakistan is studied elsewhere, the purpose of this article is to empirically examine the implementation stages of the same policies. In doing so, the study utilizes a panel data set comprising of 60 cross-sections and 06 time series observations (2012-2017). Results of the rigorous panel regression models shows that leniency in the prescribed punishments and an exhaustive belief on the efficacy of traditional examination surveillance methods are counterproductive. The study however failed to substantiate the direct relationship of discrimination and academic dishonesty in the sample. It is therefore concluded that prescribed punishments must be awarded in letter and spirit and that there is need for coordination at different stages of the implementation. Further, the study also recommends that traditional forms of examination surveillance must be augmented using modern technology.

Published
2022
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31. Image Encryption Using Elliptic Curves and Rossby/Drift Wave Triads

Author

Ullah, Ikram, Hayat, Umar, and Bustamante, Miguel D.

Subjects
Computer Science - Cryptography and Security, Mathematics - Algebraic Geometry, Physics - Atmospheric and Oceanic Physics, 14H52, 76B15, 11T71, 14G50
Abstract

We propose an image encryption scheme based on quasi-resonant Rossby/drift wave triads (related to elliptic surfaces) and Mordell elliptic curves (MECs). By defining a total order on quasi-resonant triads, at a first stage we construct quasi-resonant triads using auxiliary parameters of elliptic surfaces in order to generate pseudo-random numbers. At a second stage, we employ an MEC to construct a dynamic substitution box (S-box) for the plain image. The generated pseudo-random numbers and S-box are used to provide diffusion and confusion, respectively, in the tested image. We test the proposed scheme against well-known attacks by encrypting all gray images taken from the USC-SIPI image database. Our experimental results indicate the high security of the newly developed scheme. Finally, via extensive comparisons we show that the new scheme outperforms other popular schemes., Comment: Accepted and published version (Entropy 2020, 22, 454)

Published
2020
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33. Efficient and Secure Substitution Box and Random Number Generators Over Mordell Elliptic Curves

Author

Ullah, Ikram, Azam, Naveed Ahmed, and Hayat, Umar

Subjects
Computer Science - Cryptography and Security, Mathematics - Algebraic Geometry
Abstract

Elliptic curve cryptography has received great attention in recent years due to its high resistance against modern cryptanalysis. The aim of this article is to present efficient generators to generate substitution boxes (S-boxes) and pseudo random numbers which are essential for many well-known cryptosystems. These generators are based on a special class of ordered Mordell elliptic curves. Rigorous analyses are performed to test the security strength of the proposed generators. For a given prime, the experimental results reveal that the proposed generators are capable of generating a large number of distinct, mutually uncorrelated, cryptographically strong S-boxes and sequences of random numbers in low time and space complexity. Furthermore, it is evident from the comparison that the proposed schemes can efficiently generate secure S-boxes and random numbers as compared to some of the well-known existing schemes over different mathematical structures.

Published
2019

38. Unlocking Diversity in Cardiovascular Clinical Research: Lessons from the SCAN-MP (Screening for Cardiac Amyloidosis with Nuclear Imaging in Minority Populations) Study

Author

Wardhere, Abdirahaman, primary, Bampatsias, Dimitrios, additional, Cohn, Elizabeth, additional, Fine, Denise, additional, de Freitas, Cinthia, additional, Gallegos, Cesia, additional, Helmke, Stephen, additional, Ionescu, Natalia, additional, Ivrose, Janvier, additional, Rodriguez, Carlos, additional, Sabogal, Natalia, additional, Fils, Sergylensky, additional, Henry, Terrence, additional, Teruya, Sergio, additional, Ullah, Ikram, additional, Kurian, Damian, additional, Raiszadeh, Farbod, additional, Miller, Edward J, additional, Ruberg, Frederick L., additional, and Maurer, Mathew S., additional

Published
2024
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44. Efficient Construction of a Substitution Box Based on a Mordell Elliptic Curve Over a Finite Field

Author

Azam, Naveed Ahmed, Hayat, Umar, and Ullah, Ikram

Subjects
Computer Science - Cryptography and Security
Abstract

Elliptic curve cryptography (ECC) is used in many security systems due to its small key size and high security as compared to the other cryptosystems. In many well-known security systems substitution box (S-box) is the only non-linear component. Recently, it is shown that the security of a cryptosystem can be improved by using dynamic S-boxes instead of a static S-box. This fact necessitates the construction of new secure S-boxes. In this paper, we propose an efficient method for the generation of S-boxes based on a class of Mordell elliptic curves (MECs) over prime fields by defining different total orders. The proposed scheme is developed in such a way that for each input it outputs an S-box in linear time and constant space. Due to this property, our method takes less time and space as compared to all existing S-box construction methods over elliptic curve. Furthermore, it is shown by the computational results that the proposed method is capable of generating cryptographically strong S-boxes with comparable security to some of the existing S-boxes constructed over different mathematical structures., Comment: We have updated Lemma 4. Two new sections (5.1 and 5.2) are added. Results related to time complexity are corrected

Published
2018

45. Sensor-Based PUF: A Lightweight Random Number Generator for Resource Constrained IoT Devices

Author

Hillerström, Maaike, Ullah, Ikram, Havinga, Paul J. M., Rannenberg, Kai, Editor-in-Chief, Soares Barbosa, Luís, Editorial Board Member, Goedicke, Michael, Editorial Board Member, Tatnall, Arthur, Editorial Board Member, Neuhold, Erich J., Editorial Board Member, Stiller, Burkhard, Editorial Board Member, Tröltzsch, Fredi, Editorial Board Member, Pries-Heje, Jan, Editorial Board Member, Kreps, David, Editorial Board Member, Reis, Ricardo, Editorial Board Member, Furnell, Steven, Editorial Board Member, Mercier-Laurent, Eunika, Editorial Board Member, Winckler, Marco, Editorial Board Member, Malaka, Rainer, Editorial Board Member, Camarinha-Matos, Luis M., editor, Ribeiro, Luis, editor, and Strous, Leon, editor

Published
2022
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