“The paper talks about several uses for this type of sabotage, but the most interesting — and devastating — is to modify a chip’s random number generator. This technique could, for example, reduce the amount of entropy in Intel’s hardware random number generator from 128 bits to 32 bits. This could be done without triggering any of the built-in self-tests, without disabling any of the built-in self-tests, and without failing any randomness tests. I have no idea if the NSA convinced Intel to do this with the hardware random number generator it embedded into its CPU chips, but I do know that it could. Yes, this is a conspiracy theory. But I’m not willing to discount such things anymore.”
https://www.schneier.com/blog/archives/2013/09/surreptitiously.html
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