一类具有时变参数的混沌同步保密通信方法

A kind of chaotic synchronized secure communication methodology with time-varying parameters

针对混沌同步保密通信中由于同步实现导致参数敏感性下降,无法保证安全性的普遍问题,提出一类新的具有时变参数的混沌同步保密通信的理论方法,并证明了其同步稳定性.时变参数使混沌系统运动轨迹总体服从奇异吸引子,局部小范围作随机波动,混沌运动的复杂性显著提高,难以用参数估计方法破译.参数敏感度级数从1级提高到10级,使之有效抵御穷举法、基于相空间重构等方法的攻击.若采用主动-被动同步方式,同步误差为零.本方法适用于一类连续混沌系统.

A kind of chaotic synchronized secure communication scheme with time-varying parameters was proposed to solve the problem of parameter sensitivity reduction caused by chaotic synchronization, which further degrades the security. The stability of synchronization was then proved. It is unique that the chaotic activities obey the strange attractor globally, while in local they move randomly. As a result, the chaotic obits are more complex, the parameter sensitivity degree rises from 1 to 10. It makes the system hard to be broken by exhaustive attack and phase space restructuring. When the active-passive decomposition method is used, the secure communication scheme has no synchronized error. Simulation results indicate the effectiveness of the method. It is applicable to a kind of continuous chaotic system.