"Mark H. Wood via Gnupg-users" <gnupg-users@gnupg.org> writes:
> I didn't know where else to turn, for folks who might be able to point > me at standards for or discussion of embedding crypto signatures in > image formats, to detect tampering with the image. While you can technically embed some kind of signature in pretty much any image format's XMP or EXIF metadata (and some cameras do), the only graphic format with a reasonably well-defined and supported signature scheme is probably PDF. Unfortunately PDF's complex structure makes correct implementation difficult and most vendors (including Adobe) have had numerous issues: https://www.ndss-symposium.org/wp-content/uploads/ndss2021_1B-4_24117_paper.pdf You may be interested in the Adobe et al. Content Authenticity Initiative, though that scheme's compatibility with open-source software seems dubious. -Valtteri
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