Group Blind Digital Signatures: A Scalable Solution to Electronic Cash

In this paper we construct a practical group blind signature scheme. Our scheme combines the already existing notions of blind signatures and group signatures. It is an extension of Camenisch and Stadler's Group Signature Scheme [5] that adds the blindness property. We show how to use our group blind signatures to construct an electronic cash system in which multiple banks can securely distribute anonymous and untraceable e-cash. Moreover, the identity of the e-cash issuing bank is concealed, which is conceptually novel. The space, time, and communication complexities of the relevant parameters and operations are independent of the group size.

• Type: Conference
• Year: 1998
• Where: FC
• Authors: Anna Lysyanskaya, Zulfikar Ramzan
• Keywords: Blind Signatures, Cryptology, FC 1998, Group Blind Signatures, Group Signature