Abstract
SummaryKey revocation and ciphertext update are two critical issues for identity‐based encryption schemes. Designing an identity‐based encryption scheme with key revocation and ciphertext update functionalities simultaneously is still a tricky challenge. Recently, Liang et al. introduce the notion of cloud‐based revocable identity‐based proxy re‐encryption scheme and present a concrete scheme with aim to solve the challenge. In this paper, we first showed the scheme of Liang et al. cannot resist re‐encryption key forgery attack and collusion attack. We then introduced a new cryptographic primitive, named cloud‐aided revocable identity‐based encryption scheme with ciphertext update (CA‐RIBE‐CU), to achieve both ciphertext update and key revocation for identity‐based encryption schemes. We also defined the syntax and security model of CA‐RIBE‐CU scheme and proposed a CA‐RIBE‐CU scheme from bilinear pairings. Compared with the scheme of Liang et al., our proposed scheme is collusion resistant, takes lower decryption computation, and achieves constant size re‐encrypted ciphertext. Finally, we proved the proposed scheme is adaptively secure under the decisional bilinear Diffie–Hellman assumption in the standard model. Copyright © 2016 John Wiley & Sons, Ltd.
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