Description
For many mutli-party applications group signatures are important cryptographic primitives that can be used for the purpose of anonymity and privacy. In classical group signatures members of a group are able to sign messages anonymously on behalf of the group. However, there exists a designated authority, called group manager, that initializes the scheme, adds new group members, and is able to open group signatures, i.e., identify the signer. Obviously, in classical group signatures the group manager is given enormous power compared to other group members and is required to be trusted to act as predestinated. On the other hand there exist multi-party applications where such centralized control (trust) is undesirable, e.g., federated (democratic) systems. For this kind of applications it is desirable to have a group signature scheme which provides similar properties but is independent of any centralized control.
Prochains exposés
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Oblivious Transfer from Zero-Knowledge Proofs (or how to achieve round-optimal quantum Oblivious Transfer without structure)
Orateur : Léo Colisson - Université Grenoble Alpes
We provide a generic construction to turn any classical Zero-Knowledge (ZK) protocol into a composable oblivious transfer (OT) protocol (the protocol itself involving quantum interactions), mostly lifting the round-complexity properties and security guarantees (plain-model/statistical security/unstructured functions…) of the ZK protocol to the resulting OT protocol. Such a construction is unlikely[…]-
Cryptography
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