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- Cracking the Windows 95 Screen Saver Password
- Article Extracted from 2600 Magazine
- Volume 13 #4
- =============================================
-
- Defeating the Windows 95 Screensaver
- by rdpzza
-
- While many may consider this a trivial exercise, cracking
- the password scheme for Win95 may be useful to some of
- you out there. Some may even find ways to have phun with
- it as well.
-
- 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.
-
- Text file downloaded from the HackerZ Hideout @ www.hackersclub.com/km
-