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this post was submitted on 30 Nov 2024
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Programming
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Yeah, these things quickly boil down to the trusting trust thing (see Ken Thompson's Turing award lecture). You can't trust any system until you've designed every bit from scratch.
You gotta put your trust somewhere, or you won't be able to implement jack.
This isn't as limiting as it seems at first glance though. Sending pictures of a true one time pad cipher doesn't rely on the security of the transport or the camera. From there you can choose to make a compromise of convenience and get to things like Private key cryptography where the ciphers are done via basic xor arithmetic you can do by hand.