Image encryption using TSRMSC associated with DWT

A novel technique for gray scale image encryption and decryption scheme using two stage random matrix shift cipher (TSRMSC) associated with discrete wavelet transformation (DWT) is proposed. Earlier proposed schemes for encoding and decoding of images discuss only about the keys, but in our proposed approach, keys and the arrangement of random matrix shift cipher parameters are mandatory. We have formulated a formula for the all possible range to choose keys for encrypting and decrypting an image. An examples of computer simulation are give to analyze the capability of this proposed technique. The encrypted image is robust to decoding even on the application of exact keys if the correct arrangement is unknown to the decoder. We have also given comparison between our proposed approach with P. Kumar et al. (J. Opt. 14 (2012) 045401 (8pp)).