A New Non-linear Cross-Encryption Method for Video Images

In view of that the two-dimensional chaotic sequence only holds a low limited-accuracy, as well as the linear complexity of linear feedback shift register generated-sequence is limited, also the generated-sequence is easily decoded. This paper proposes one kind of the two-dimensional mix chaos algorithm for image encryption based on uniting the ultra-chaos switch system and the linear feedback shift register technology. This algorithm can carry on the XOR operation fast after mapping the threshold value, so it enables the image cryptograph of system output to obtain a non-linear pseudo-random code sequence presenting enormous cycle period by the FPGA hardware platform with the low iterative number of times. Through experiments and simulation, results show that: this algorithm implementing by the FPGA platform not only can have the big enhancement in the image encryption speed aspect, moreover also holds the good security superiority in the anti-attack aspect.