> In your example, each picture on your phone (that you are trying to upload to iCloud) would be hashed, and the hash would be sent to Apple. This is exactly th

> In your example, each picture on your phone (that you are trying to upload to iCloud) would be hashed, and the hash would be sent to Apple. This is exactly the opposite of what they are promising with NeuralHash. No. You are wrong. They do hash each image and they do upload the hash derived safety voucher always. Here is the Apple technical paper: https://www.apple.com/child-safety/pdf/CSAM_Detection_Technical_Summary.pdf https://www.apple.com/child-safety/pdf/CSAM_Detection_Techni... There is a fairly complicated cryptographic algorithm which, according to apple, lets them open the safety voucher only if there is a match with the database. The user devices only have a cryptographicaly blinded version of the hash database which they can’t turn back to real hashes without apple’s private key. This means that the plain neuralhashes are not available to the end users.