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In the current age of constrained local storage capacity, ensuring the security and privacy of user data against unauthorized third-party access has grown significantly more vital. Searchable Encryption (SE) has arisen as a promising method for preserving the confidentiality of user data while also enabling efficient search capabilities. Certificateless Searchable Encryption (CLSE) stands out among a range of SE cryptosystems by effectively addressing issues related to certification management and key escrow. Nevertheless, the majority of current CLSE approaches heavily depend on computationally intensive bilinear pairings and do not offer robust support for conjunctive keyword searches in multi-receiver scenarios. To address these limitations, we propose a Pairing-free Dynamic Multi-receiver Certificateless Authenticated Searchable Encryption (PDMCLASE) scheme. PDMCLASE focuses on three essential features: (1) Dynamic multi-receiver functionality, enabling new data receivers to access documents while revoking access for existing receivers; (2) Conjunctive subset keyword search, empowering data receivers to perform efficient conjunctive searches on subsets of keywords; and (3) Data sender authentication, ensuring the authenticity of keyword encryption by the data sender. Furthermore, PDMCLASE attains keyword privacy by leveraging elliptic curve hardness problems within the standard model. Through our performance analysis, we establish that PDMCLASE not only delivers improved functionality but also demonstrates reduced computational overhead when compared to alternative schemes. [ABSTRACT FROM AUTHOR]

One of the essential technologies in the medical industry for achieving high performance and accuracy is the Medical Internet of Things (MIoT). The MIoT technology processes a large amount of patient information in real-time. And therefore, it poses a high risk of leaking personal information. Furthermore, as data is sent over public networks, security is critical in MIoT. To overcome the above issues, we developed a designated tester-based Certificateless Public-key Encryption with Conjunctive Keyword search for cloud-based MIoT in dynamic multi-user environment (dCL-PECK). This study explores three features: (1). A secure channel is not necessary to transfer the data from the data-user (i.e., data owner or data receiver) to the designated tester (i.e., medical cloud server) and allows only the designated tester to execute the test algorithm. (2). Data is encrypted only once for multiple data users and supports conjunctive keyword search. (3). Users are added and revoked dynamically. Furthermore, the proposed scheme is provably secure under ciphertext indistinguishable against inside and outside adversaries and trapdoor indistinguishable against outside adversaries. Finally, theoretical and experimental analyses have been performed, demonstrating that the proposed system is better than similar Certificateless Keyword Search (CLKS) systems. As a result, we feel that it is suitable for cloud-based MIoT. [ABSTRACT FROM AUTHOR]