[Cryptography] Population Count (POPC) instruction

[Whitfield Diffie]

> I'm in the middle of a discussion about computer architecture.
> The POPC (bit population count) instruction came up.
> Pardon my ignorance, why is this instruction so important in cryptographic
> (or cryptanalytic) circles?

    Popc is the instruction used to count the number of bits that agree
> between two bits strings which is a central process in cryptanalysis.


                          Whit
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