Content Authentication Semi-Fragile Watermarking Algorithm

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Research and Implementation of Content Authentication Semi-Fragile Watermarking Algorithm. This program implements image semi-fragile watermarking using a DCT-based approach, featuring adaptive embedding strategies and tamper detection mechanisms. Particularly suitable for researchers studying semi-fragile watermarking techniques.

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This paper presents the research and implementation of a content authentication semi-fragile watermarking algorithm. We propose a Discrete Cosine Transform (DCT)-based algorithm for implementing semi-fragile watermarks in images. The implementation involves key components including DCT coefficient selection, watermark embedding using quantization index modulation, and fragility control mechanisms that distinguish between malicious tampering and acceptable compression. The algorithm utilizes middle-frequency DCT coefficients to balance robustness and fragility, with threshold-based tamper detection that calculates distortion levels through coefficient comparison. This approach is particularly suitable for researchers interested in semi-fragile watermarking, providing a framework that includes watermark generation, embedding functions, and authentication verification procedures.

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