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Using jitter as an entropy source also came up in the recent discussions around Linux getrandom(2) blocking:

https://news.ycombinator.com/item?id=21152552

https://fuchsia.dev/fuchsia-src/zircon/jitterentropy/config-...

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/lin...

Whether or not the kernel should be doing this is one issue, but VeraCrypt should be using whatever the kernel provides rather than rolling their own.

Maybe they need their own random number generator for the pre-boot decryption process? (Although come to think of it, I guess you only really need random numbers to generate the key when encrypting.)

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