Digital Signatures for Authenticating Compressed JPEG Images

ePrint Report: Digital Signatures for Authenticating Compressed JPEG Images

Simon Erfurth

We construct a digital signature scheme for images that allows the image to be compressed without invalidating the signature. More specifically, given a JPEG image signed with our signature scheme, a third party can compress the image using JPEG compression, and, as long as the quantization tables only include powers of two, derive a valid signature for the compressed image, without access to the secret signing key, and without …

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