Structural Digital Signature and Semi-Fragile Fingerprinting for Image Authentication in Wavelet Domain

Authors:
Yan Zhu;Chang-Tsun Li;Hong-Jia Zhao
Affiliations:
Peking University, China;University of Warwick, UK;Peking University, China
Venue:
IAS '07 Proceedings of the Third International Symposium on Information Assurance and Security
Year:
2007

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Abstract

In this paper, a novel semi-fragile authentication scheme based on block-mean quantization in the wavelet domain is proposed for image authentication. The scheme is composed of a structural digital signature process and a semi-fragile watermarking/ fingerprinting algorithm. In the signature process, the invariants are extracted as authentication codes from the quantization relationships and hierarchy information of discrete wavelet decomposition. The authentication codes consist of inter-block and intrablock codes in order to detect and localize tampering. The semi-fragile fingerprinting algorithm is intended to embed the signature via the use of block-mean quantization. The proposed scheme can effectively detect and localize the malicious modification while tolerating lossy compression.