Quote:
|
Originally Posted by Fuckin Bill
While it may be extremely difficult, anything mathematical is solvable. The program that creates the graphic is based on math, and the program to try and read it would be based on math. It's just a matter of the right formula. While an average programmer might have a hard time with it, a programmer working with the right mathematical brain could do it.
|
while mostly true there is one thing that should be mentioned... the idea behind the captcha system is a standard turing test; a method to differentiate from human intelligence and artificial intelligence...the main difference is the use of optics for decoding it... even in a simple captcha system like the one fl_prn_str posted; requires more than mathematics to crack it (i know, i've done it)... while mathematics is the bulk of it there is a need to emulate the optical part of the system, therefor integrating an advanced OCR type system... the main issue is the flexibility that the human brain has when linked with our eyes and the more strict guidelines that a computer program would have to follow...
in the end, yes the one displayed by antonio (a sample captcha from a hotmail signup i presume) is far more complicated than the one fl_prn_str displayed (craigslist example), yet it can eventually be cracked with the write programming... just as a note though, the hotmail one has to be the most complicated one i've seen with very simple modifications... even the aim and yahoo captcha systems would be easier and have a higher hit ratio than the hotmail one...