An efficient certificateless public key encryption scheme with authorized equality test in healthcare environments

Certificateless cryptography aims at combining the advantages of public key cryptography and identity based cryptography to avoid the certificate management and the key escrow problem. In this paper, we present a novel certificateless public key encryption scheme on the elliptic curve over the ring, whose security is based on the hardness assumption of Bilinear Diffie-Hellman problem and factoring the large number as in an RSA protocol. Moreover, since our scheme requires only one pairing operation in decryption, it is significantly more efficient than other related schemes. In addition, based on our encryption system, we also propose a protocol to protect the confidentiality and integrity of information in the scenario of Internet of Things with constrained resource nodes.

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An efficient RSA-based certificateless public key encryption scheme

Discrete Applied Mathematics ◽

10.1016/j.dam.2017.02.019 ◽

2018 ◽

Vol 241 ◽

pp. 39-47 ◽

Cited By ~ 8

Author(s):

Xi-Jun Lin ◽

Lin Sun ◽

Haipeng Qu

Keyword(s):

Public Key ◽

Encryption Scheme ◽

Public Key Encryption ◽

Certificateless Public Key Encryption

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Pairing-Free Identity-Based Encryption with Authorized Equality Test in Online Social Networks

International Journal of Foundations of Computer Science ◽

10.1142/s0129054119400185 ◽

2019 ◽

Vol 30 (04) ◽

pp. 647-664

Author(s):

Libing Wu ◽

Yubo Zhang ◽

Kim-Kwang Raymond Choo ◽

Debiao He

Keyword(s):

Social Networking ◽

Online Social Networks ◽

Keyword Search ◽

Public Key ◽

Encryption Scheme ◽

Public Key Encryption ◽

Identity Based Encryption ◽

Identity Based ◽

Equality Test ◽

Chosen Ciphertext Attack

Online social networking applications have become more and more popular in the advance of the technological age. Much of our personal information has been disclosed in social networking activities and privacy-preserving still remains a research challenge in social network. Public key encryption scheme with equality test(PKEET), which is an extension of public key encryption with keyword search (PEKS), seems to be a solution. PKEET enables the tester to check whether two given ciphertexts are derived from the same plaintext. Recently, Zhu et al. proposed a pairing-free public key encryption scheme with equality test based on the traditional public key cryptosystem. However, it suffers from certificates management issue. In this paper, we propose a pairing-free identity-based encryption scheme with authorized equality test(PF-IBEAET). The PF-IBEAET scheme also provides fine-grained authorizations. We prove that the scheme is one way secure against chosen identity and chosen ciphertext attack (OW-ID-CCA) and indistinguishable against chosen-identity and chosen-ciphertext attack (IND-ID-CCA) in the random oracle model (ROM). Performance analysis shows that the scheme achieves a better performance than similar schemes.

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