im guessing that because md5 encryption is a one way hash then the challenge
is some sort of id that helps decoding it...
so if im right then the a system that uses md5 then it stores the challenges that
tells the system how to decrypt the hash right?
if im wrong please correct me and if im wrong is there a way to create challenges?
cuz it doesnt make much sense...
oh and how can i code something in md5?

i think md5 is one way encryption you can only compare hashes from input with those you have in your database for example
if you want to decrypt sth u have to use JTR and dictionary or brute force in incremental mode
never heard of those "id's"

greetz

shadowrun is correct, md5 is a one way hash algorithm
an example of its use is popular forum software,
whereby a md5 hash is generated from a user's password, this md5 hash is stored in the forum's database.
then when a user logs on the password they supply is run throught the md5 hash routine and the result is compared to the md5 hash stored in the forum's database
so if ur password is "abc" then the md5 hash would look like this "900150983cd24fb0d6963f7d28e17f72"

Great job and a super plethora of info fellas!

Jimmy