Chaotic image encryption in transform domains

This paper presents a new approach for image encryption based on the chaotic Baker map, but in the different transform domains. The discrete cosine transform (DCT), the discrete sine transform (DST), the discrete wavelet transform (DWT) and the additive wavelet transform (AWT) are exploited in the proposed encryption approach. Chaotic encryption is performed in these transform domains to make use of the characteristics of each domain. A comparison study between all transform domain encryption schemes is held in the presence of different attacks. Results of this comparison study are in favor of encryption in the DST domain if the degree of randomness is of major concern.