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The popularity of Internet usage although increases exponentially, it isincapable of providing the security for exchange of confidential data betweenthe users. As a result, several cryptosystems for encryption of data and imageshave been developed for secured transmission over Internet. In this work, ascheme for Image encryption/decryption based on Vector Quantization (VQ) hasbeen proposed that concurrently encodes the images for compression and shufflesthe codebook and the index matrix using pseudorandom sequences for encryption.The processing time of the proposed scheme is much less than the othercryptosystems, because it does not use any traditional cryptographicoperations, and instead it performs swapping between the contents of thecodebook with respect to a random sequence, which resulted an indirectshuffling of the contents of the index matrix. It may be noted that thesecurity of the proposed cryptosystem depends on the generation and theexchange of the random sequences used. Since the generation of truly randomsequences are not practically feasible, we simulate the proposed scheme usingMATLAB, where its operators like rand(method, seed), randperm(n) has been usedto generate pseudorandom sequences and it has been seen that the proposedcryptosystem shows the expected performance.

Design of Image Cryptosystem by Simultaneous VQ-Compression and Shuffling of Codebook and Index Matrix