Compression Tolerant Image Authentication

It is straightforward to apply general schemes for authenticating digital data to the problem of authenticating digital images. However, such a scheme would not authenticate images that have undergone lossy compression, even though they may not have been manipulated otherwise. In this paper we propose a scheme for authenticating the visual content of digital images. This scheme is robust to compression noise, but will detect deliberate manipulation of the image-data. The proposed scheme is based on the extraction of featurepoints from the image. These feature-points are de ned so as to be relatively una ected by lossy compression. The set of feature-points from a given image is encrypted using public key encryption, to generate the digital signature of the image. Authenticity is veri ed by comparing the feature-points of the image in question, with those recovered from the previously computed digital signature.