An Image Secret Sharing Technique with Block Based Image Coding

A (t, n) threshold secret image sharing scheme generates n share images from a secret image in such a way that any t or more share images can be used to reconstruct the secret image. In this paper we have proposed a (t, n) secret image sharing scheme where the secret image is first encoded by block based lossy compression technique and define t sub-images. The image compression technique gives a good quality image. To enhance the security level, the sub-images are scrambled by Arnold transform and then shares are generated. Finally, image hiding (i.e., Steganography) concept is adopted to hide the shares within cover images. The proposed method gives good quality of the stego images.

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