权限可控的公开验证代理签密方案

对Shin等人的可公开验证签密方案和Jung等人的可公开验证代理签密方案进行了密码学分析，研究了它们的机密性和代理权限问题，发现这两个方案中的公开验证过程都是以泄漏消息的机密性为代价的，同时发现Jung等人的方案没有实现代理权限的管理。在此基础上提出对Shin方案改进的一个权限可控的公开验证性代理签密方案，克服了其公开验证过程中的安全漏洞，并对代理权限进行了全面限制。在基于某些密码学假设的前提下，证明了方案的安全性。

Proxy signcryption scheme with public verifiability and controllable authority

The Shin's signcryption scheme with public verifiability of Shin et al.and the proxy signcryption scheme of Jung et al. were cryptoanalyzed and improved. By studying the confidentiality of Shin's scheme and Jung's scheme, and the proxy authority of Jung's scheme, the fact is that the confidentiality of Shin's scheme and Jung's scheme was lost, and the proxy authority of Jung's scheme was not controlled. Then a modification based on Shin's scheme was presented. The modification was a security proxy signcryption scheme with public verifiability and controllable authority. Based on some cryptographic assumptions, the security of the scheme was also proved.