A ROBUST CHAOS-BASED IMAGE ENCRYPTION SCHEME

摘要

A DCT domain image encryption scheme based on chaotic shuffling table is proposed, in which the shuffling tables are generated by several Logistic maps. This scheme is robust to normal image processing, such as noising, smoothing, compressing, and even print-scan processing. In this scheme, key space is easy to be adjusted by choosing the number of Logistic maps. The encrypted image is still highly compressible since shuffling operation is confined in DCT equal-frequency coefficients. What is more, a random number, called nonce, is introduced to initialize initial values of Logistic maps, which ensures that the proposed scheme can resist chosen-plain-text cryptanalysis.