中国物理B ›› 2008, Vol. 17 ›› Issue (11): 4027-4032.doi: 10.1088/1674-1056/17/11/015
杨素香1, 徐淑奖2, 王继志2
Yang Su-Xiang (徐淑奖)a, Xu Shu-Jiang (王继志)b, Wang Ji-Zhi (杨素香)b
摘要: Recently, two chaotic image encryption schemes have been proposed, in which shuffling the positions and changing the grey values of image pixels are combined. This paper provides the chosen plaintext attack to recover the corresponding plaintext of a given ciphertext. Furthermore, it points out that the two schemes are not sufficiently sensitive to small changes of the plaintext. Based on the given analysis, it proposes an improved algorithm which includes two rounds of substitution and one round of permutation to strengthen the overall performance.
中图分类号: (Control of chaos, applications of chaos)