中国物理B ›› 2012, Vol. 21 ›› Issue (6): 60502-060502.doi: 10.1088/1674-1056/21/6/060502

• GENERAL • 上一篇    下一篇

Cryptanalysis on an image block encryption algorithm based on spatiotemporal chaos

王兴元, 何国祥   

  1. Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024, China
  • 收稿日期:2011-08-09 修回日期:2011-12-11 出版日期:2012-05-01 发布日期:2012-05-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61173183, 60973152, and 60573172), the Doctoral Program Foundation of Institution of Higher Education of China (Grant No. 20070141014), and the Natural Science Foundation of Liaoning Province, China (Grant No. 20082165).

Cryptanalysis on an image block encryption algorithm based on spatiotemporal chaos

Wang Xing-Yuan(王兴元)† and He Guo-Xiang(何国祥)‡   

  1. Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024, China
  • Received:2011-08-09 Revised:2011-12-11 Online:2012-05-01 Published:2012-05-01
  • Contact: Wang Xing-Yuan, He Guo-Xiang E-mail:wangxy@dlut.edu.cn; hegxabc@126.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61173183, 60973152, and 60573172), the Doctoral Program Foundation of Institution of Higher Education of China (Grant No. 20070141014), and the Natural Science Foundation of Liaoning Province, China (Grant No. 20082165).

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摘要： An image block encryption scheme based on spatiotemporal chaos has been proposed recently. In this paper, we analyse the security weakness of the proposal. The main problem of the original scheme is that the generated keystream remains unchanged for encrypting every image. Based on the flaws, we demonstrate a chosen plaintext attack for revealing the equivalent keys with only 6 pairs of plaintext/ciphertext used. Finally, experimental results show the validity of our attack.

关键词: encryption, spatiotemporal chaos, chosen plaintext attack, equivalent keys

Abstract: An image block encryption scheme based on spatiotemporal chaos has been proposed recently. In this paper, we analyse the security weakness of the proposal. The main problem of the original scheme is that the generated keystream remains unchanged for encrypting every image. Based on the flaws, we demonstrate a chosen plaintext attack for revealing the equivalent keys with only 6 pairs of plaintext/ciphertext used. Finally, experimental results show the validity of our attack.

Key words: encryption, spatiotemporal chaos, chosen plaintext attack, equivalent keys

中图分类号:  (Nonlinear dynamics and chaos)

  • 05.45.-a
05.45.Ac (Low-dimensional chaos) 05.45.Vx (Communication using chaos)