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We study digital camera identification based on sensor noise in an adversarial environment with asymmetries. We focus on fingerprint-copy attacks, where the attacker has access to JPEG images only, while the defender may leverage uncompressed images. This leads to the notion of fragile sensor fingerprints that are only available to the defender but do not survive lossy compression. Experiments with...
We analyze a class of first significant digit (FSD) histogram restoration techniques designed to cover up traces of previous JPEG compressions under a minimum cost constraint. We argue that such minimal distortion mappings introduce strong artifacts to the distribution of DCT coefficients, which become particularly prevalent in the domain of second significant digits (SSDs). Empirical findings from...
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