提出一種基于被擾動的Lorenz系統的加密算法。首先通過Legendre多項式對Lorenz系統中的系統參數b進行擾動，然后再利用Lorenz產生的隨機序列對原文信息進行一系列的操作變換，使得加密的信息更加安全。通過擾動有效的補償了計算機有限精度導致的混沌系統退化行為，經對本算法的模擬實驗及詳細性能分析，結果表明該加密算法能夠在保證加密速度的前提下，使得混沌序列隨機性、加密系統安全性等方面都優于基于三維混沌密碼系統和基于聯合混沌加密系統。

　　Abstract:

　　In this paper， a chaotic encryption algorithm based on the disturbed Lorenz system is proposed. Firstly， the Lorenz system parameters b is disturbed by using the Legendre polynomial in order to compensate the degradation behavior of chaotic systems due to the computer’s finite precision， then the plaintexts are encrypted by using the pseudo-random sequence which are produced by the disturbed Lorenz system. As a result， the algorithm can effectively resist all known attacks and make information more secure. The proposed algorithm is described in detail， along with its security analysis and implementation. Theoretical analyses and computer simulations both confirm that the new algorithm possesses high security and fast encryption speed for practical information encryption.