Re-purposing Perceptual Hashing based Client Side Scanning for Physical Surveillance. (arXiv:2212.04107v1 [cs.CR])

Content scanning systems employ perceptual hashing algorithms to scan user
content for illegal material, such as child pornography or terrorist
recruitment flyers. Perceptual hashing algorithms help determine whether two
images are visually similar while preserving the privacy of the input images.
Several efforts from industry and academia propose to conduct content scanning
on client devices such as smartphones due to the impending roll out of
end-to-end encryption that will make server-side content scanning difficult.
However, these proposals have met with …

client client side scanning hashing physical scanning surveillance