Abstract :
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Digital media content creation/capturing, processing and distribution have witnessed a phenomenal growth over the past decade. This media content is often distributed in compressed and encrypted format and watermarking of these media for copyright violation detection, proof of ownership or distributorship, media authentication, sometimes need to be carried out in compressed-encrypted domain. It is sometimes necessary to watermark these compressed encrypted media items in the compressed-encrypted domain itself for tamper detection or ownership declaration or copyright management purposes. It is a challenge to watermark these compressed encrypted streams as the compression process would have packed the information of raw media into a low number of bits and encryption would have randomized the compressed bit stream. Attempting to watermark such a randomized bit stream can cause a dramatic degradation of the media quality. Thus it is necessary to choose an encryption scheme that is both secure and will allow watermarking in a predictable manner in the compressed encrypted domain. This paper will survey on the compression and watermarking techniques in image encryption.
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