Communications of the ACM
ACISP '01 Proceedings of the 6th Australasian Conference on Information Security and Privacy
ICICS '97 Proceedings of the First International Conference on Information and Communication Security
Secure distributed key generation for discrete-log based cryptosystems
EUROCRYPT'99 Proceedings of the 17th international conference on Theory and application of cryptographic techniques
An analysis of proxy signatures: is a secure channel necessary?
CT-RSA'03 Proceedings of the 2003 RSA conference on The cryptographers' track
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In a proxy signature scheme, a potential signer delegates his capabilities to a proxy signer, who can sign documents on behalf of him. The recipient of the signature verifies both identities: that of the delegator and that of the proxy signer. There are many proposals of proxy signature schemes, but security of them has not been considered in a formal way until the appearance of [2,8]. If the entities which take part in a proxy signature scheme are formed by sets of participants, then we refer to it as a fully distributed proxy signature scheme [4]. In this work, we extend the security definitions introduced in [2] to the scenario of fully distributed proxy signature schemes, and we propose a specific scheme which is secure in this new model.