Microsoft PhotoDNA creates a “unique digital signature” of an image which can be matched against a database containing signatures of previously identified illegal images like CSAM. The technology is used by companies including Google, Facebook, and Twitter. Microsoft says: A PhotoDNA hash is not reversible, and therefore cannot be used to recreate an image. Ribosome inverts PhotoDNA hashes using machine learning. This demonstration uses provocative images to make a point: rough body shapes and f...