Design of a tweakable image encryption algorithm using chaos-based schema

摘要

In this paper, we introduce a tweakable colour image encryption scheme based on confusion-diffusion architecture, we use the piecewise nonlinear chaotic map to generate pseudo-random sequences through the encryption process. With the addition of the tweak identical, a plain image can be encrypted to different cipher images. Thus, it is impossible for an opponent to break the scheme. Satisfactory security performances are attained by only one encryption round and the effectiveness is much enhanced. We describe our algorithm in details and illustrate its security, effectiveness and robustness by using security analysis and simulations. Comparisons with existing colour image encryption schemes have been performed showing that the proposed scheme offers very affirmative performances.