基于双线性对的代理重加密方案(英文)

Certificateless Proxy Re-encryption Scheme from Pairings

代理重加密的概念是由Mambo和Okamoto提出来的,其功能是将用一个用户公钥加密的密文转换成用另一个用户的公钥加密的密文,且加密是针对同一个明文而言的。但是这类方案都是基于传统的PKI公钥密码体制和身份密码体制的。本研究提出了一个新的无证书代理重加密方案,新方案优于先前的方案且能实现多次代理重加密性质,其算法比其它方案更简单,并且给出了详细的CCA安全性证明。

The concept of proxy re-encryption was introduced by Mambo and Okamoto.Its function takes a ciphertext for a message encrypted under an identity＇s public key and transforms it into a ciphertext for the same message under another identity＇s public key.But these schemes were generally based on PKC or ID-based cryptosystem.We present a new proxy re-encryption scheme based on certificateless public key cryptosystem.Our scheme has advantages over prior schemes.It can realize multi-use property.The algorithm of our scheme is simpler than that of other schemes and a CCA proof to this scheme is given.