Deciphering the Simple Machines Forum audio Captcha

The Simple Machine’s Forum audio Captcha that has been hardened from attack. I have contacted SMF
about this flaw and it has been verified.

I go into greater detail of how i am able to break this captcha here:
http://www.rooksecurity.com/blog/?p=6

Exploit Code: http://www.rooksecurity.com/exploits/smf_captcha.zip

This captcha has been broken before and exploit code is available here:
http://www.securityfocus.com/archive/1/471641 . The fix was to add a randomly generated static.

I was able to write code to decipher the audio file using a Fuzzy Logic comparison
http://en.wikipedia.org/wiki/Fuzzy_logic . The comparison is the Hamming Distance
http://en.wikipedia.org/wiki/Hamming_distance between the original audio file and the damaged one
generated by the Captcha.

peace