摘要: Traditionally, the strongest notion of security for undeniable and confirmer signatures is invisibility under adaptive attacks. This property was promoted by Camenisch Michels they provided schemes with this property. Gennaro, Krawczyk Rabin (GKR) developed an RSA-based scheme which much more efficient than Michels, but it does not have invisibility. We give as GKR scheme, has invisibility. We suggest that anonymity most relevant signatures. a precise definition in multi-user setting show are closely related. Finally, we can be achieved even when parties use completely different cryptographic primitives.
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