I somehow never realized until now that the reason a 521 bit prime is used instead of a 512 bit prime for NIST elliptic curves is that 2521\ -1 is a Mersenne prime.
I somehow never realized until now that the reason a 521 bit prime is used instead of a 512 bit prime for NIST elliptic curves is that 2521\ -1 is a Mersenne prime.
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