Improving the Security of Pseudo-random Sequence Generator Based on Chen Chaotic System

摘要

In this letter, the cause of vulnerability of the original pseudo-random sequence generator based on Chen chaotic system is analyzed, and the corresponding enhancement methods are proposed. Transient data produced by the calculation among fixed-point numbers is used to improve the performance of the original scheme. Statistical tests and security analysis indicate that the modified scheme is more secure than the original one, and the computational complexity of the brute force attack is O(2~n). At the same time, it can still maintain the pseudo-random characteristics and satisfy the other performance requirements of pseudo-random sequence generator.