面向多服务的可灵活撤销的非对称公钥叛逆者追踪方案

Multi-service-oriented asymmetric public-key traitor tracing scheme with flexible revocation

Matsushita等人提出了一个可灵活撤销用户的公钥叛逆者追踪方案,但其方案是对称方案,并且没有提供多服务的功能。利用不经意多项式估值协议(OPE)和服务参数提出了一个改进的Matsushita方案。改进方案在保持了原Matsushita方案可灵活撤销用户、黑盒子追踪、安全性不变的基础上,增加了提供多种服务、防止叛逆者抵赖(非对称)等优点,整体性能好于Matsushita方案。

Matsushita et al. proposed a traitor tracing scheme with flexible user revocation, which was a symmetric scheme, and did not provide multiple-service capability. An improved scheme was proposed by using Oblivious Polynomial Evaluation（OPE） and service parameter. In this improved scheme, such features of Matsushita＇s as flexible user revocation, black-box tracing and security remained, and other advantages such as providing multi-service and preventing traitors from repudiation（asymmetry） were added. The whole capabilities of the improved scheme were better than that of Matsushita＇s.