How to do this using macOS and free tools. Introduces a new version of Dintch which lets you control its speed, particularly on Apple silicon.
hash
How to design a method which not only detects errors in file data, but enables them to be corrected? A tale of Hamming, Reed, Solomon and CDs.
Apple’s controversial proposals to check photos for CSAM content before they’re uploaded to iCloud depend on image matching, as explained here.
The Eclectic Light Company 