在公钥密码体制中，通常涉及到三方通信，如何高效地加密与签名成为主要问题。结合代理与签密的思想，设计一种新的代理重签密方案。该方案基于双线性对的性质和离散对数的困难性问题，通过对明文的二次加密与签名，解决了传统签名和加密分时进行的缺陷，并将代理方的签名与普通的签名区分开来，同时可以进行公开验证签名。经过证明分析并与现有其他方案比较，该方案正确，且满足保密性和不可伪造性，高效安全。%In public key cryptography,usually it involves three parties communication,the way of efficient encryption and signature becomes the major problem.Combining the agent and signcryption ideas,we designed a new proxy re-signcryption scheme.The scheme is based on the property of bilinear pairing and the difficulty of discrete logarithm,by encrypting and signing on plaintext twice,it solves the defect of traditional way in separating the signature and encryption time,while distinguishes the agent signature from ordinary signature.At the same time the signature can be publicly verified.Through provable analysis and comparing it with other existing schemes,this one is correct and satisfies the confidentiality and unforgeability,it is efficient and safe.
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