Secret signatures: how to achieve business privacy efficiently?

Authors:
Byoungcheon Lee;Kim-Kwang Raymond Choo;Jeongmo Yang;Seungjae Yoo
Affiliations:
Department of Information Security, Joongbu University, Chungnam, Korea;Australian Institute of Criminology, Canberra, ACT, Australia;Department of Information Security, Joongbu University, Chungnam, Korea;Department of Information Security, Joongbu University, Chungnam, Korea
Venue:
WISA'07 Proceedings of the 8th international conference on Information security applications
Year:
2007

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Abstract

Digital signatures provide authentication and nonrepudiation in a public way in the sense that anyone can verify the validity of a digital signature using the corresponding public key. In this paper, we consider the issues of (1) signature privacy and (2) the corresponding public provability of signature. We propose a new digital signature variant, secret signature, which provides authentication and nonrepudiation to the designated receiver only. If required, the correctness of the secret signature can be proven to the public either by the signer or the receiver. We conclude with a discussion to demonstrate the usefulness of the proposed cryptographic primitive (e.g., achieving signature privacy in an efficient manner).