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Father of Unix Ken Thompson checkmated: Old eight-char password is finally cracked

Charles 9 Silver badge

VERY bad memory cannot be solved with mnemonics; they forget the mnemonics. In this case, they'll lose track of which two letters or not figure out how they set up their grid. Or they could just lose the book like they do their car keys or phone every other day (and forget it, they're too proud to ask for help).

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