[icq-devel] Re: ICQ 2003 password decryption

Remy Lebeau gambit47 at yahoo.com
Mon Jun 9 21:08:24 CEST 2003

--- "allicq.com administration" <admin at allicq.com>

> you don't believe me? :)
> try to change here
> the
> significance of MainLocaion paremeter into another
> one and after that try to
> connect it UIN (uin_number) through ICQ.
> what you'll see? the window "please enter your
> password".

That doesn't necessarily mean that the "MainLocation"
value holds the actual password itself.  It could just
hold some flags that tell the ICQ client that a
password is used in general and that it is stored
locally somewhere.

I have my ICQ set to always prompt for a password, so
changing that value has no effect on my setup, it
still works the same as it did before.

However, noting that, I did try changing the value and
then did a login.  The value was saved again, and this
time, only the last 8 bytes of the value where the
same as they were before.  My password happens to be 8
characters long, but that could be just a coincidence.
 I tried applying the password encryption algorithm
from the ICQ protocol to my password to see if the
value in the Registry matched, and it did not match,
not even close.


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