Po meni su ovo gluposti, captcha nije savršena ali radi, i nije problem nikad da se zamjeni/doradi... isto tako radi i MD5 ali mislim da je gori ovaj problem za MD5
MD5 has a 128 bit hash so a brute force
attack to find a collision requires at most
2^128 applications of MD5 and 2^64 by the
birthday paradox
Xiaoyun Wang and Hongbo Yu have an
attack that requires 2^39 operations
This attack takes at
most an hour and 5
minutes on a IBM P690 (supercomputer)