Group signatures with verifier-local revocation
Proceedings of the 11th ACM conference on Computer and communications security
Equipping smart devices with public key signatures
ACM Transactions on Internet Technology (TOIT)
Online subscriptions with anonymous access
Proceedings of the 2008 ACM symposium on Information, computer and communications security
Leak-free mediated group signatures
Journal of Computer Security
Efficient group signatures from bilinear pairing
CISC'05 Proceedings of the First SKLOIS conference on Information Security and Cryptology
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Group signatures are an interesting and appealing cryptographic construct with many promising potential applications. This work is motivated by attractive features of group signatures, particularly, their potential to serve as foundation for anonymous credential systems. We re-examine the entire notion of group signatures from a systems perspective and identify two new security requirements: leak-freedom and immediate-revocation, which are crucial for a large class of applications. We then present a new group signature scheme that achieves all identi.ed properties. Our scheme is based on the so-called systems architecture approach. It is more ef.cient than the state-of-the-art and facilitates easy implementation. Moreover, it reflects the wellknown separation-of-duty principle. Another benefit of our scheme is the obviated reliance on underlying anonymous communication channels, which are necessary in previous schemes.