Nicely done. Thank you for sharing. I'd like to share the following paper for anyone else who may be interested. It is about watermarking rather than a preim

Nicely done. Thank you for sharing. I'd like to share the following paper for anyone else who may be interested. It is about watermarking rather than a preimage attack. "Adversarial Embedding: A robust and elusive Steganography and Watermarking technique" https://arxiv.org/abs/1912.01487 https://arxiv.org/abs/1912.01487 Unfortunately, the existence of invisible watermarking demonstrates a separate attack on the hash. Instead of a preimage attack, this might be able to change the hash of an image that is suspected of already being a match. A true-positive would be changed into a false-negative.