Ugh! I'm tired of people looking over my shoulder when I'm typing my password. I've decided to switch to digital signatures instead. What's easier to do in your head, modular exponentiation, or elliptic curve point multiplication?
Discussion
UPDATE: according to my research, a minimum security maximum speed digital signature takes on the order of 100,000 clock cycles to complete. Given that a peak human being can compute a 20 digit multiplication in somewhere on the order of 100 seconds, unlocking a computer in this way would take many days.