Abstract
The paper presents a simple proxy re-signature scheme and its two equivalent security model.One is based on the universal composability framework,another is game-based security model.The proposed scheme is bidirectional,multi-use,transitive and key optimal.It is very attractive for its simplicity.Its security can be reduced to the Computational Diffie-Hellman assumption in the Random Oracle Model.It is also secure under the universal composability framework.
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