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An identity traceable attribute-based multi-signature scheme. (Chinese. English summary) Zbl 1340.94078
Summary: In the domain of electronic commerce and electronic government affairs, we may face the situation of signing the same document by a group of people. Moreover, we need the ability of investigating the accountability of the signer. To meet such requirements, we propose an identity traceable attribute-based multi-signature scheme. The attribute-based multi-signature (ABMS) can solve the problem of multi-signing the same document. By integrating the thought of traceability, we successfully prevent the signer from abusing his identity. Under the premise of ensuring the privacy of the signer, we achieve the goal of traceability. On the basis of the subgroup decision and the computational Diffie-Hellman (CDH) assumptions, we prove that the scheme is unforgeable in the standard model. Compared with the existing schemes, our scheme is traceability and suitable for solving the problem of responsibility of multi-signers.
94A62 Authentication, digital signatures and secret sharing
94A60 Cryptography