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A significant amount of electronic health records (EHRs) have been kept in the cloud due to the quick development of healthcare information systems. However, storing EHRs in the cloud may raise security and data privacy issues. Because of the privacy of a patient's medical data, storing it on a cloud server requires encryption. Public-key encryption with keyword search (PEKS) solves the problem of retrieval on ciphertext, thus avoiding the problem of plaintext information leakage. However, most PEKS schemes are susceptible to inside keyword guessing attacks (KGA). Besides, transmitting th...

To realize ciphertext retrieval without decryption in the public key settings, Boneh et al. in 2004 proposed a cryptographic primitive named Public-key Encryption with Keyword Search (PEKS) and proposed the first PEKS scheme. Following Boneh et al.’s work, various PEKS schemes were proposed; however, most schemes are vulnerable to inside keyword guessing attacks (IKGA). Huang and Li proposed a new primitive named Public-key Authenticated Encryption with Keyword Search (PAEKS) in 2017, which resists the IKGA in the setting of only one test server. Their main idea to resist IKGA is to require ...

Public-key Authenticated Encryption with Keyword Search (PAEKS) is a cryptographic primitive that can resist inside keyword guessing attack (KGA). However, most of the previously proposed PAEKS frameworks suffered from certificate management problem and key escrow problem. Inspired by the ideas of certificate-based cryptography, we propose a secure-channel free certificateless searchable public key authenticated encryption with keyword search (SCF-CLPAEKS) scheme which sloves the key escrow problem in identity-based cryptosystems and the cumbersome certificate problem in conventional public ke...