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This paper proposed a new blind authentication method based on the secret sharing technique with a data repair capability for grayscale document images .Shamir proposed threshold secret sharing scheme in which a secret message is transformed in to shares for keeping by participants, and when some of the shares, not necessarily all of them, are collected, the secret message can be lossless recovered.. This secret sharing scheme is useful for reducing the risk of incidental partial data loss. In additional image transformed in to a stego-image in the PNG format with an additional alpha channel for transmission on networks. For tampered block data repairing is applied by reverse Shamir scheme. It also presents the security issues and discuss on keeping high quality visual effect.

Authentication of grayscale document images using shamir secret sharing scheme.