this post was submitted on 28 Aug 2023
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If they hash the file binary data, like CRC32 or SHA, yes. But there are other hash types out there, which are more like "fingerprints" of an image. Think of how Shazam or Sound Hound can recognize a song playing, despite the extra wind, static, etc that's present. There are similar algorithms for images/videos.
No idea how difficult those are to implement, though.
There are FOSS applications that can do that (czkawka for example). What I'm not sure it's if the specific algorithm used is available and, more importantly, if the csam hashes are available for general audiences. I would assume if they are any attacker could check first and get the right amount of changes.