Group Message Authentication

13 years 2 months ago

Download eprint.iacr.org

Group signatures is a powerful primitive with many practical applications, allowing a group of parties to share a signature functionality, while protecting the anonymity of the signer. However, despite intensive research in the past years, there is still no fully satisfactory implementation of group signatures in the plain model. The schemes proposed so far are either too ineﬃcient to be used in practice, or their security is based on rather strong, non-standard assumptions. We observe that for some applications the full power of group signatures is not necessary. For example, a group signature can be veriﬁed by any third party, while in many applications such a universal veriﬁability is not needed or even not desired. Motivated by this observation, we propose a notion of group message authentication, which can be viewed as a relaxation of group signatures. Group message authentication enjoys the group-oriented features of group signatures, while dropping some of the features wh...

Bartosz Przydatek, Douglas Wikström

Real-time Traffic