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Cracking Win98 Screen Saver Passwords Print E-mail

To start with, you need to know where to look.  In 3.1, the password
was kept in
the control.ini.  Although 95 also uses the control.ini, it does not
use it for
keeping the password information.  Foe 95, you will have to look in
each of
the user.dat files.  I say each because if you have multiple users,
each user
may have a profile saved on the hard drive.  The default user.dat
file is
in the \windows directory.  The other user.dat files can be found in
the directory
\profiles\username where username changes.  As you may know, user.dat
is one of the two
files used for the registry and its is very important.  User.dat will
carry the attributes
"shr" so you will have to look accordingly.  Also, since it is so
important, a backup is
kept, namely user.da0.  This may be the previous user.dat, say when
the user changed
passwords...

Anyway, now that you have the file, where is it?  If you scan the
file for passowrd, you
will come up with the setting of whether or not the screen saver is
password protected.
This may be enough for you so you can just change it and be done.
While this little change
will be noticed, it will get you by the password.  If, however, you
wish to actually find out
the what the pass phrase is, read on.

Why find out what the pass phrase is, you ask?  Because a lot of
times users are stupid,
lazy, have bad memory or any combination of these and reuse passwords
or schemes any time a
key is needed.  This is especially true in network environments and
even more so when 95
is used as the workstation OS.  In such systems, there is the
possibility of changing the
logon password and the screen saver password at the same time.  I
wonder how that can be
useful?

Back to finding out what the phrase is.  95 has been rumored to use
dual case.  Let me
clear this rumor.  It does not.  It uses the "all upper" coding for
the password like 3.1.
The maximum length of the screen saver password is 14 characters
long.  It will allow
you to enter longer passwords, but 95 will act screwy; it won't
require the password from
screen saver, it will hang, etc.

OK, so we have the file.  Look for the string "ScreenSaver_Data".
After this is an even
string of numbres and letters ending in 00.  THere is the encrypted
pass phrase.  The
pass phrase is different from 3.1 in that 95 uses what I
call "encrypted-couplets" meaning
that for every character in the phrase, there are two encryption
values.  The first
encrypted couplet (EC) is the first hex digit of the unencrypted
ascii value, and the second
EC is the second hex digit.  For example, say the first two hex
digits after the string
"ScreenSaver_Data" are 31 41 (1A in ASCII). The 31 represents (after
decryption) 5 and
the 41, 2.  Put the digits together and you have 52h, R in ASCII.
Keep this concept in
mind while decoding the EC's because the decryption scheme is the
same for each value, only
the key changes.

Example of Screen Saver EC's decoded to password.

1AAAA26473D28  <- code in the user.dat
RDPZZA <- Win95 SS password


Try it out.



 
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