条件接收系统中机顶盒和智能卡安全通信协议

提出了条件接收系统中智能卡和机顶盒安全通信的协议.协议使用了Schnorr身份方案实现机顶盒对智能卡的认证,并使用一个非对称密码系统实现智能卡对机顶盒的认证.协议最小化了智能卡的在线计算负担,同时保持与其它协议同样的安全水平.对协议的安全性和性能进行了分析.分析结果表明,协议对于恶意攻击是鲁棒的,并且非常适合于只有有限处理能力的智能卡.而且,协议为不同的条件接收系统使用同样的机顶盒提供了可能,因为在协议中机顶盒不需要事先存储任何条件接收系统的秘密私有数据.

Secure communication protocol between set-top box and smart card in conditional access system

A protocol for secure communication between the set-top box and the smart card in conditional access systems is proposed. The protocol uses the Schnorr identification scheme to achieve the authentication of the smart card to the set-top box and uses an asymmetric cryptosystem to achieve the authentication of the set-top box to the smart card. The protocol minimizes the online computational burden of the smart card while provides the same level of security as other protocols. Both security and performance of the protocol are analyzed. The result of the analysis shows that the protocol is robust to the malicious attacks and very applicable to the smart card with limited processing power. Moreover, the protocol makes it possible that various conditional access systems use the same set-top box because it is not necessary for the set-top box to store any secret proprietary data of conditional access system in advance in the protocol.