%0 Journal Article
%T Cryptanalysis and improvement of a class of hyperchaos based image encryption algorithms<br>对一类超混沌图像加密算法的密码分析与改进
%A Zhu Cong-Xu
%A Sun Ke-Hui
%A <br>朱从旭
%A 孙克辉
%J 物理学报
%D 2012
%I 
%X The security of a class of hyperchaotic image encryption algorithms is analysed. The results show that the shuffling process can be separated from the confusion process, and the formulas of encryption are simple, which makes the ciphertext cannot resist the attacks from chosen plaintext and ciphertext. Then we propose an improved and enhanced algorithm based on hyperchaos. The improved algorithm includes two rounds of encryption operation. The theoretical analyses and the experimental results indicate that the improved algorithm can overcome these flaws and has better cryptographic performances in resisting differential attacks and speed of encryption.
%K hyperchaos
%K image encryption
%K chosen plaintext attack
%K chosen ciphertext attack<br>超混沌
%K 图像加密
%K 选择明文攻击
%K 选择密文攻击
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=78F360FC29C47911BE298D89CD86D45D&yid=99E9153A83D4CB11&vid=1D0FA33DA02ABACD&iid=59906B3B2830C2C5&sid=C4A30A1682C3F9E1&eid=C4A30A1682C3F9E1&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=18