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CBHacking comments on December 2014 Bragging Thread - Less Wrong Discussion
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Out of curiosity, what's the greatest number of significant digits that you've ever memorized, in any time frame?
Also 10 (EDIT: 20) (random) decimal digits is about 70 bits of entropy, which is an extraordinarily strong password and borders on being a usable cryptographic key (not for long-term safety against high-resource opposition, but well out of "easily brute-forced by a modern computer" territory). Do you use the same kind of memorization you did here for passwords? I can (and do) memorize passwords longer than 20 characters, but I don't really count that because I generate the mnemonic first and then the password from it. Memorizing the password doesn't take long, but sometimes getting the mnemonic into my head does...
I use multiple passwords of consisting of 12 elements of a..z, A..Z, 0..9, and ~20 symbol characters, generated randomly. Total entropy of these is around 76 bits.
10 decimal digits is actually more like 33 bits of entropy.
Yeah, I (roughly) computed for 20 digits (what Alex said) and then wrote the wrong thing, because... derp? Also, yes, it's up to 66.4 bits, not 70. My bad