Abstract

Deniable authentication allows the participants to deny an authentication process as there is no any evidence that it ever took place. It is quite suitable for the privacy-preserving scenario. Combining with the ring signature property, the deniable authentication can reach the source hiding. In other words, the receiver is only convinced that a member in a group is authenticating a message without knowing which one. It is also deniable, that is the receiver cannot convince anyone else that this message was indeed authenticated. We present a deniable ring authentication based on the projective hash function. With this building block the underlying (encryption) scheme is not required to be CCA secure, which results in a more realistic deniable authentication protocol.

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