web based php md5 crack

[kaits]

I saw one PHP web based md5 crack system that is about 700 mb

How to do somethig like that?
Some PHP skript that can encode this md5 encoded string (string = password)
5f4dcc3b5aa765d61d8327deb882cf99

on the page you enter a string into text bod and give a lenght and click on and the skript decrypts it

is something possible? I mean web based?
if not, is there any program for windows that can do that?

 

[brÅinstorm]

encode this md5 encoded string

i think, we are talking about decoding this string, aren't we? ;D

to encode a string, you can use md5().
if you really want to decode, that's kind of impossible, because md5 is not reversibly.
the only way is to encode variations of strings via md5 and test if they are similar.

http://php.net/
I must point out to all the people who read the notes this far that MD5 is
_not_ encryption in a traditional sense. Creating an MD5 digest (or hash)
of a message simply creates 128 bits that can be used to almost positively
identify that message or object in the future. You use MD5 if you want to
validate that information is true. For example, you may ask a user to
submit a message through a browser POST and save an MD5 of that message in
a database for a preview function. When the user submits it the second
time, running the MD5 hash of the new version of the text and comparing it
to the original MD5 in the database will tell you if the text has changed
at all. This is how MD5 is used -- it is _not_ for encrypting things so
as to get the data back afterward -- the MD5 hash version does _not_
contain the data of the original in a new form.

vergebe gott mir mein schlechtes englisch..

 

[Wolfsbein]

Eine Möglichkeit gäbe es, aber das würde wohl ziemlich lange dauern . Wie lange eigentlich? Kann das mal jemand ausrechnen?
Du schreibst eine Schleife, die alle Zeichen ausprobiert und immer nach der Anzahl erlaubter Zeichen den String um eins verlängert. Der String wird mit md5 verschlüsselt und mit dem zu knackenden Code verglichen. Das ganze ist natürlich rein hypotethisch .