this post was submitted on 19 Jun 2023
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Technology
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Apple (and Google, Microsoft, etc) are checking signatures of all files on their services to detect illegal stuff. They do it for copyrighted content and they do it for CSAM.
Checking against a known-malicious hash is very different than claiming to have access to the plain data. In fact, even for the known-malicious hashes, the companies doing the checks usually don't have access to the source data (so i.e. they don't even necessarily know what it contains).