参数可变的离散混沌加密系统 *

提出一种参数动态可变的离散混沌加密算法 ,该算法使用线性同余随机数发生器产生混沌映射的系统参数和迭代次数对应子密钥使用顺序 ,同时通过输出反馈方式动态改变混沌映射初值、迭代次数以及线性同余随机数发生器参数 ,输出与明文相加取模后生成密文。实验结果和安全性分析表明 ,该算法密钥空间大 ,对明文和密钥敏感 ,能有效抵抗选择明文等穷举攻击和统计分析攻击。

Discrete chaotic cryptography using changing parameters

This paper proposed a new chaotic cryptosystem based on the logistic map using changed parameters. System pa-rameters and the order of sub-key corresponding to the iterative number of chaotic map were used by using linear congruent generators, changed the initial number and iterative number of chaotic map and LCG parameters dynamically by output feed-back. Added their outputs to plaintext with modulus to produce ciphertext. Simulation results and security analyses show that the proposed cryptosystem has large key space, high sensitivity to key and plaintext, and can resist the brute attack as chosen plaintext attack and statistical attack.