Chosen-ciphertext secure bidirectional proxy broadcast re-encryption schemes
by Jin Sun; Yupu Hu
International Journal of Information and Communication Technology (IJICT), Vol. 8, No. 4, 2016

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.

Online publication date: Wed, 01-Jun-2016

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