Simplified Universally Composable Proxy Re-Signature
简单的通用可组合代理重签名方案

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.