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With the development of communication and information technologies, the telemedicine system has infiltrated many aspects of medicine field. It allows doctors to simultaneously diagnose patients in different areas, which provides great convenience to people. However, the increasing medical data brings serious challenges to people, such as data storage and processing. To reduce data management costs and enjoy convenient services, more and more individuals and medical institutions prefer to store data in the cloud. Recently, many public key encryption with keyword search (PEKS) schemes have been designed to address the security and privacy of the outsourced data. However, most of the existing schemes support only single-keyword search, and cannot suitable for multi-user environment. To resolve these issues, we construct a certificateless public key encryption with conjunctive keyword search scheme for multi-user system (mCLPECK), in which the same data only needs to be encrypted once and can be searched by multi-receiver. At the same time, the mCLPECK scheme supports multi-keyword search. Furthermore, we show the proposed scheme can resist chosen keyword attacks, and has lower storage and computation overhead compared to other related schemes. [ABSTRACT FROM AUTHOR]

The smart healthcare system (SHS) provides a new information service mode. It greatly improves the diagnostic efficiency by monitoring patients' signs information via various wearable devices. To ensure the confidentiality of sensitive information, the security and privacy issues have drawn wide attention. The searchable encryption technology is suitable for addressing these issues, because it supports search over encrypted data and provides data privacy protection. Recently, many searchable public-key encryption (SPE) schemes have been designed to balance security and efficiency. However, these SPE schemes face the challenge of certificate management or key escrow. This is because they are constructed based on public key infrastructure (PKI) or identity (ID) cryptosystem. Meanwhile, most of SPE schemes are subject to great security threats, such as keyword guessing attacks (KGA). To resolve the above problems, this paper designs a secure certificateless SPE scheme for SHS, and this scheme does not require the use of secure channels, i.e., a SCF-CLSPE scheme. We prove that this SCF-CLSPE scheme can resist KGA and chosen keyword attacks (CKA) under standard model. In addition, the results of performance analysis indicate that this SCF-CLSPE scheme can achieve better efficiency. [ABSTRACT FROM AUTHOR]