有噪信道中的流密码重同步方法研究

同步流密码在保密通信中具有很大优势，但在实际应用中，同步丢失的危险并不能被完全消除，因此，在某些应用当中使用了固定重同步方法．本文通过对此方法进行研究分析，指出在有噪低速可靠传感器网络中使用同步流密码，其加密安全性能至少等价于固定重同步系统，甚至有所加强.研究设计了新的重同步方法，同时进行仿真实验,结果表明，新设计的方法相对于固定重同步来讲对信道状态依赖得比较少，所以在有噪信道中比固定重同步方法更加有效。

Study on Resynchronization of Stream Ciphers in Noisy Channel

Synchronous stream ciphers enjoy certain advantages in secure communication. However, the risk of synchronization loss cannot be eliminated completely, and fixed resynchronization is applied in some cases. In this paper, we pointed out that the encryption security of synchronous stream cipher in low-speed and reliable sensor networks reaches the same level as fixed re-synchronization system, and even stronger. The simulation of the new re-synchronization system shows that the proposed method is more effective than fixed resynchronization in a noisy channel, because it is less dependent on channel states than fixed resynchronization.