Color image encryption based on one-time keys and robust chaotic maps

Authors:
Hongjun Liu;Xingyuan Wang
Affiliations:
Department of Electronic and Information Engineering, Dalian University of Technology, Dalian 116024, China and Weifang Vocational College, Weifang 261041, China;Department of Electronic and Information Engineering, Dalian University of Technology, Dalian 116024, China
Venue:
Computers & Mathematics with Applications
Year:
2010

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Abstract

We designed a stream-cipher algorithm based on one-time keys and robust chaotic maps, in order to get high security and improve the dynamical degradation. We utilized the piecewise linear chaotic map as the generator of a pseudo-random key stream sequence. The initial conditions were generated by the true random number generators, the MD5 of the mouse positions. We applied the algorithm to encrypt the color image, and got the satisfactory level security by two measures: NPCR and UACI. When the collision of MD5 had been found, we combined the algorithm with the traditional cycle encryption to ensure higher security. The ciphered image is robust against noise, and makes known attack unfeasible. It is suitable for application in color image encryption.