Abstract
The policy-controlled signature (PCS) scheme uses the access policy to control signature verification permission. However public access policy that may contain private information will leak user privacy. At the same time, the expressiveness of access structures in the PCS schemes is weak. Therefore, we propose a policy-controlled signature scheme with strong expressiveness and privacy-preserving policy (PCS-PP), in which linear secret sharing schemes is to design access structure which has strong expression, the three primes composite order bilinear groups is used to hide the attribute value into the attribute name that may expose the privacy data by data distortion concept. The proposed PCS-PP scheme not only has correctness and privacy-preserving policy, but also supports fine-grained signature verification. In addition, the unforgeability is proved in the random oracle model. Compared to the related schemes, the proposed PCS-PP scheme has superiority in features, computation cost and storage.
Highlights
The policy-controlled signature (PCS) scheme is a key part of digital signatures and supports access control of signature verifier
The main works are presented as follows: 1) Use an linear secret sharing schemes (LSSS) matrix to develop the access structure that has strong expressiveness; apply three primes composite order bilinear groups [21] based on data distortion to expose the public attribute name and hide the attribute value, and present a privacy-preserving policy (PCS-PP) scheme
Definition 3 (Unforgeability): The PCS-PP scheme is (QH,QS, QC, ε)-secure existential unforgeability under a chosen message and credential exposure attack if there are no PPT adversary AEUF-CMCEA with a non-negligible probability SuccEUF-CMEA(k) = ε in k, where AEUF-CMCEA runs in time at most t, make at most QH queries to the hash random oracle, and at most QS, and QC queries to the signing oracle (SO) and credential generation oracle (CRO) respectively
Summary
The policy-controlled signature (PCS) scheme is a key part of digital signatures and supports access control of signature verifier. The PCS schemes [1]–[3] do not take account of the privacy-preserving access policy, nor do they provide strong expressiveness of access. This paper employs LSSS to design a strong expressiveness of access structure and borrows the thought of data distortion to propose a policy-controlled signature scheme with strong expressiveness and privacy-preserving policy (PCS-PP) scheme. The main works are presented as follows: 1) Use an LSSS matrix to develop the access structure that has strong expressiveness; apply three primes composite order bilinear groups [21] based on data distortion to expose the public attribute name and hide the attribute value, and present a PCS-PP scheme.
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