Security

A Bilateral Secure Threshold Signature Scheme With Distinguished Signing Authorities

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Executive Summary

Forward secure threshold signature plays an important role in distributed signature. In order to enhance the security and efficient of the forward secure threshold signature, a new forward secure threshold signature is proposed. The proposed scheme achieves not only the forward security but also the backward security for the threshold signature. The disclosure of group secret key or individual secret keys can not threat the signature security of all time period. Instead of signing the whole document, the group members only sign a smaller part by themselves in the scheme. The size of a group signature is equivalent to that of any individual signature. Such an approach achieves the justification of labor-division and responsibility-sharing inherent in the group works.

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