Unique Group Signatures.
Matthew Franklin, Haibin Zhang · 2012
Abstract. We initiate the study of unique group signature such that signatures of the same message by the same user will always have a large common component (i.e., unique identifier). It enables an efficient detection algorithm, revealing the identities of illegal users, which is fun-damentally different from previous primitives. We present a number of unique group signature schemes (without random oracles) under a va-riety of security models that extend the standard security models of ordinary group signatures. Our work is a beneficial step towards miti-gating the well-known group signature paradox, and it also has many other interesting applications and efficiency implications.