In this paper, a new system is presented for authenticating image content using digital watermark embedding in the DWT-domain of JPEG2000. A semi-fragile signature, generated from the host signal, is embedded into the...
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ISBN:
(纸本)9781424432974
In this paper, a new system is presented for authenticating image content using digital watermark embedding in the DWT-domain of JPEG2000. A semi-fragile signature, generated from the host signal, is embedded into the image for content verification. Generation as well as embedding of the signature is adapted to the image content for performance improvement. The system is tested extensively and performance results are compared to those of methods proposed by other authors. We show that our new system outperforms the methods compared to. Our semi-fragileauthentication is robust against non-malicious modifications, such as lossy compression, noise, image blurring and sharpening, changes of luminance and contrast as well as scaling. But in contrast to other methods, our authentication is secure at the same time, which we proof by different forgery attacks.
This paper describes an attack on semi-fragile image authentication schemes proposed in papers In this attack, the adversary manipulates an authentic image and queries a verifier with the corrupted image. According to...
详细信息
ISBN:
(纸本)0819450235
This paper describes an attack on semi-fragile image authentication schemes proposed in papers In this attack, the adversary manipulates an authentic image and queries a verifier with the corrupted image. According to the answers from the verifier, the adversary can disclose the secret relationship graphs used to produce a signature. With the disclosed relationship graphs, the adversary can impersonate an innocent person to forge authentic images easily. A countermeasure to this attack is to change scheme parameters with the relationship edges so that the relationship graphs reconstructed by the attacker are different from the original one. Sequentially, the attacker is hard to forge an authentic image without correct relationship graphs.
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