摘要
提出了一种新的流密码设计方案,利用两个混沌系统产生的序列进行序列值和控制参数的互扰,得到新的密钥流序列.对互扰序列和Logistic序列进行NIST测试,证明新的流密码设计方案产生的互扰序列的密码学特性要好于单一混沌系统产生的密钥流序列;提出适用于混沌伪随机序列稳定性测试的k错近似熵定义,并将其应用于测试互扰序列及Logistic序列,结果显示,互扰序列的稳定性要好于Logistic序列.将互扰序列用作图像的加密和解密,仿真结果显示,互扰序列能够有效且安全地掩盖明文信息.
A new stream cipher design scheme is proposed, which uses the sequences generated by two chaotic systems to inter-perturb their sequence values and the control parameter, so as to obtain a new sequence as key stream. Inter-perturbed sequence and Logistic sequence are tested by several tests of NIST＇s （ National Institute of Standards and Technology） STS randomness test suite. Simulation results prove that the cryptographical properties of inter-perturbation sequence are better than those of Logistic sequence, k-error approximate entropy is proposed to test the stability of inter-perturbed sequence and Logistic sequence. Simulations indicate that the stability of inter-perturbed sequence is better than that of Logistic sequence. An image is encrypted and decrypted by the inter-perturbed sequence. Simulation results show that the inter-perturbation sequence can cover up plaintext effectively and safely.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第10期6132-6138,共7页
Acta Physica Sinica
基金
国家自然科学基金(批准号:60372004)
广东省自然科学基金(批准号:06025729)资助的课题~~
关键词
混沌系统
互扰序列
密钥流
chaotic system, inter-perturbed sequence, key stream
