摘要
分析Logistic混沌映射所产生的序列用于加密时存在的安全问题,针对这些安全问题提出相应的改进算法.算法通过增大分支参数的值解决Logistic混沌映射所存在的"稳定窗"、空白窗口和序列分布不均匀等问题,通过取模运算解决产生的序列超界的问题,突破了分支控制参数不能大于4的限制.实验表明,改进算法所产生序列的伪随机性好,计算复杂度低,同时密钥空间有大幅度提高,非常适合于多媒体等数据的加密.
Security of the encryption algorithm,in which logistic map is used,is analyzed.Moreover,an improved algorithm to the problem is proposed.The present problems because of using logistic map,such as stable window,blank window,non-uniform sequence distribution,and etc.,is solved by increasing the branch parameters value.On the other hand,sequence over bounds is also sorted out through modular and break through the restriction which branch parameters are smaller than four.Experiments show that sequence created in our algorithm has a good pseudo randomness,a low calculation complexity,a giant key space,and it is very suitable for the multimedia data encryption.
出处
《小型微型计算机系统》
CSCD
北大核心
2010年第6期1073-1076,共4页
Journal of Chinese Computer Systems
基金
国家自然科学基金项目(60574030)资助
湖南省软科学课题(2007ZK3049)资助
