Content-based Authentication using Hash Function in Digital Images

H. Lim, M.E. Lee, S.Y. Park, and W.H. Cho (Korea)

Keywords

Watermarking, Contentbased Authentication, Imagedescription vector, Hash Function

Abstract

In this paper, we present a content-based secure authentic watermarking technique using a hash function in digital images. To generate the secure and content-based watermark, a Hopfield network is first employed on the edge patterns and then the extracted digest vectors of the image are inputted to the Hash function for a seed value of a pseudo random number generator. Watermark embedding is based on the block-based spread spectrum method and the strength of watermark is adjusted according to the local statistics of DCT coefficients in a zig-zag scan line in AC subband to achieve a good balance between imperceptibility and robustness. The proposed authentication technique can distinguish between malicious and innocuous manipulations by the use of content-based robust watermarking. Threshold selection for the verification of authentication is analyzed statistically. The numerical experiments show that the proposed technique is very efficient in the performance of robust authentication.

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