Provable Data Possession (PDP) protocol makes it possible for cloud users to check whether the cloud servers possess their original data without downloading all the data. However, most of the existing PDP schemes are based on either public key infrastructure (PKI) or identity-based cryptography, which will suffer from issues of expensive certificate management or key escrow. In this paper, we propose a new construction of certificateless provable group shared data possession (CL-PGSDP) protocol by making use of certificateless cryptography, which will eliminate the above issues. Meanwhile, by taking advantage of zero-knowledge protocol and randomization method, the proposed CL-PGSDP protocol leaks no information of the stored data and the group user's identity to the verifiers during the verifying process, which is of the property of comprehensive privacy preservation. In addition, our protocol also supports efficient user revocation from the group. Security analysis and experimental evaluation indicate that our CL-PGSDP protocol provides strong security with desirable efficiency.
In this paper, we propose the optimal 4lnove ZKlP (Zero-Knowledge Interactive Proof systems) of knowledge for SAT and its application. Using the trapdoor bit commitment scheme and the WI(Witness Indistingushable) and the WH(Witness Hiding), we show that as compared with 6-move ZKlP for SAT proposed by 111, the proposed ZKlP is 4-move ZKlP for SAT and under claw-Free pairs of function the proposed ZKlP is also 4-move ZKlP in comparison with 5-move ZKlP proposed by I21 under the same assumption. Moreover, we show that the proposed scheme is more efficient than t31' s scheme at the points of computational complexity and communication complexity and also propose the secure identification scheme against the chosen ciphertext attack, using the proposed scheme.
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