Title: Chosen-ciphertext secure bidirectional proxy broadcast re-encryption schemes

Authors: Jin Sun; Yupu Hu

Addresses: Department of Application Mathematics, Xi'an University of Technology, Xi'an, 710048, China; Key Lab of Computer Network and Information Security, Xidian University, Xi'an, 710071, China ' Key Lab of Computer Network and Information Security, Xidian University, Xi'an, 710071, China

Abstract: A proxy re-encryption (PRE) scheme supports the delegation of decryption rights via a proxy, who makes the ciphertexts decryptable by the delegatee. However, how to structure a chosen-ciphertext secure proxy re-encryption scheme without pair is still an open question. In this paper, by adjusting the Schnorr signature scheme and giving the accessional ciphertext components, a bidirectional (which the proxy is able to transform ciphertexts in both directions) proxy broadcast re-encryption schemes (PBRE) was proposed without pair, and the reduction of scheme's security is the computational Diffie-Hellman (CDH) assumption. The proof of security shows that the proposed scheme is chosen-ciphertext attack secure in the random oracle model.

Keywords: chosen-ciphertext attack security; provably secure; bidirectional proxy re-encryption; broadcast encryption; cryptography; ciphertexts; Schnorr signature scheme; random oracle model.

DOI: 10.1504/IJICT.2016.076798

International Journal of Information and Communication Technology, 2016 Vol.8 No.4, pp.405 - 419

Available online: 26 Mar 2016

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