Unconditionally secure authentication schemes and practical and theoretical consequences

The Vernam scheme protects the privacy unconditionally, but is completely insecure to protect the authenticity of a message. Schemes will be discussed in this paper that protect the authenticity unconditionally. The definition of unconditional security ...

We propose ring authentication in unconditionally secure setting. In a ring authentication system a sender can choose a set of users and construct an authenticated message for a receiver such that the receiver can verify authenticity of the message with ...

A group signature scheme allows a group member to sign messages anonymously on behalf of the group, while in case of a dispute, a designated entity can reveal the identity of a signature's originator. Group signature schemes can be used as a basic ...