Privacy and Anonymity Protection with Blind Threshold Signatures

Wen-Shenq Juang, Chin-Laung Lei, and Horng-Twu Liaw
International Journal of Electronic Commerce,
Volume 7, Number 2, Fall 2002, pp.143.

Abstract: A set of group-oriented blind (t, n) threshold signature schemes is proposed based on the discrete logarithm problem. Using these schemes, any t out of n signers in a group can represent the group in signing blind threshold signatures. A threshold signature in the proposed schemes is the same size as an individual signature, and the signature verification process is simplified by means of a group public key. The schemes are suitable for single-authority applications in privacy protection, secure voting systems, and anonymous payment systems for distributing the power of a single authority. The assistance of a mutually trusted authority is not required. In addition, individual signers can choose their own private keys, and all the members together decide on the group public key.

Key Words and Phrases: Anonymity, anonymous payment systems, blind signatures, privacy, secure voting systems, security, threshold signatures.