结合混沌的虚拟光学成像加密系统性能分析

针对虚拟光学成像系统中随机模板的安全性,提出了基于混沌的改进算法。引入混沌系统来构建随机模板,借助于混沌系统的非线性、伪随机、对初值高度敏感等特性提高算法的安全性。对混沌系统的选取和混沌输出序列的预处理进行了详细的讨论。并且在虚拟环境下对明文和随机模板在透镜前的干涉过程引入权重因子,进一步提高算法的复杂度。最后,对结合混沌的虚拟光学成像加密系统从统计分析,密钥敏感性,密钥空间等方面进行了全面的安全性讨论。理论分析和数值仿真表明,结合混沌后的加密系统具有较高的安全性。

Performance analysis of virtual optical imaging encryption system combined with chaotic system

In view of the safety of random mask in virtual optical imaging system, an improved algorithm was proposed based on chaos. In the proposed algorithm, chaotic system was introduced to generate the random mask, and suggestions on choice of chaos and pretreatment method of the chaotic pseudo-random sequences were proposed in detail. Security of the encryption system is improved by taking the advantage of special characteristics of the chaotic system, such as nonlinearity, pseudo-randomness and high sensitivity to initial values. Further, in the digital environment, weighting factor was introduced at the interference process of the original image and random phase mask so as to improve the complexity of the system. Fmally, safety of the proposed virtual optical imaging system combined with chaotic system was comprehensively discussed based on the statistical analysis, sensitivity of the keys and key space. Theoretical analysis and simulation results demonstrate that the safety level of the encryption system is enhanced effectively.