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Copyright protection and secrecy of some sensitive data is essential in this present digital era which deals with the advances in cloud computing and big data analytics. Digital watermarking is a popular method for copyright protection whereas cryptography takes care in hiding information as well as for secure transmission of data in a manner that is unreadable to a third party. Combination of both these techniques enhances the security and copyright protection aspects for the concealment of transmitted information. This paper presents a way of achieving those by combining both of these methods together as a joint scheme. Here a robust SVD based algorithm is proposed for embedding a watermark on a host image and then encrypts the resultant stego-image using chaotic logistic map in DCT coefficients. The decryption process is non-blind and requires the help of the key used in encryption. The joint algorithm has been found to be image independent due to its good performance for several popular test images.

A Joint SVD based Watermarking and Encryption Scheme using Chaotic Logistic Map