Secured patient information transmission using reversible watermarking and DNA encrytion for medical images

Reversible Watermarking is the technique of embedding secret messages into a cover image and recovering both the embedded secret message and the cover image without any distortion. One of the high quality and popular reversible data hiding methods is Difference Expansion method. In this paper, Difference Pair Mapping (DPM) method is used to embed the message into the cover image. The DPM method is based on predicting the pixel values and hiding the secret data with arbitrary threshold. The simulation results show that the hiding capacity is increased in DPM method when compared to other Difference Expansion techniques. Further, in order to provide security, DNA based encryption algorithm is used to resist the statistical and exhaustive attacks 2382 C. Vinoth Kumar, V. Natarajan and P. Poonguzhali over the image. The combined difference expansion and encryption algorithm provides high embedding capacity along with high security.

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