I know rdrand bugs are in the news, but I still find the rdrand conspiracy theory (and all the technical debt put in place to 'work around' the conspiracy) super weird.
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"My CPU is evil, but only in this one very specific way"
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Don't think that is the concern...
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Predictable entropy is the ultimate covert backdoor as it allows you to mitm encrypted communications without any infiltration or exfiltration (which are typically difficult to hide).
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Because of this one must never rely solely on a non-audited blackbox entropy source, be it a CPU instruction, a TPM or an HSM.
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