Compression of Quasi-Group Encrypted Grayscale Images

When data is transmitted over insecure bandwidth limited channels, data compression and encryption is always necessary. Slepian Wolf coding can be applied to the lossless compression of encrypted sources. But for the images, image compression techniques present in the literature that make use of Markov properties in the Slepian Wolf decoder do not offer significant result. This paper proposes compression of encrypted grayscale image.An encryption algorithm called Quasi group is used to encrypt thegrayscale image so as to protect the image during transmission. The encrypted image is compressed progressively in resolution by Resolution Progressive Compression (RPC) technique. The experimental result shows that the proposed approach provides significant security and high PSNR value.

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