A Chaos-based Image Compression and Encryption Scheme Using DCT and Dynamic Huffman Coding
In the past few years, a variety of chaos-based image cryptosystems have been proposed, but most of which only possess encryption functions without compressing the plain images. Recently, an approach for integrating compression and encryption using multiple Huffman coding tables was proposed. However, it was lately found that this approach suffers from the chosen-plaintext attack if the multiple Huffman tables are not selected properly. In this paper, a chaos-based image compression and encryption scheme utilizing discrete cosine transform (DCT) and dynamic Huffman coding is proposed, so that the security loophole is fixed without sacrificing the compression property, where the tradeoff between cipher- image size and security is controlled by a parameter called mixing percentage. The proposed image cryptosystem also performs well in security analyses such as key sensitivity, plaintext sensitivity and coded stream randomness tests.
chaotic cryptography image encryption DCT dynamic Huffman coding
Kwok-wo Wong Yaobin Mao Guanrong Chen
Department of Electronic Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon Tong, Hong Kong SAR, China
国际会议
第四届亚太地区混沌控制与同步会议(The Fourth Asia-Pacific Workshop on Chaos Control and Synchronization)
哈尔滨
英文
5-14
2007-08-24（万方平台首次上网日期，不代表论文的发表时间）