Among her adult feats, she was able to multiply two random 13-digit numbers in a few seconds.

BBC: Obituary: India's 'human computer' Shakuntala Devi

The random 18-digit code plus two check digits will have a four-digit prefix added and it will have intelligence in it.

FORBES: America's Attempted Domination Of LEI Slams into FSB Wall

One idea that has taken root is the use of a token the size of a key fob that generates a random six-digit password every 60 seconds.

FORBES: Magazine Article