摘要
指出文献[1]设计的加密算法中的替代变换算法不能抵抗已知明文攻击,由极少的明密文对就可求出密钥;且置换变换算法没有提供足够的密钥空间。据此提出了一种对该算法的攻击方案,并用实例对该加密算法进行攻击,证明攻击方案完全有效。同时,也提出了对该算法的改进建议。
This paper points out that the substitute encryption algorithm proposed in referencel cannot resist known-plaintext attack. The analyses show that the key of this cipher can be found with very few known plaintext-cipher pairs; and the permutation algorithm is only provided with very small key space. So an attack scheme is proposed, and the example of the attack scheme successfully brokes the encryption algorithm. A proposal for improvement algorithm is proposed, too.
出处
《计算机工程》
EI
CAS
CSCD
北大核心
2006年第23期168-170,共3页
Computer Engineering
基金
湖南省自然科学基金资助项目(03JJY4054)
关键词
混沌序列
序列密码
图像加密
SP网络
Chaotic sequences
Sequence cipher
Image encryption
SP network
