Windows Secret Feature.

amit08255 By amit08255, 2nd May 2014 | Follow this author | RSS Feed
Posted in Wikinut>Guides>Technology>Computer Software

This article will teach you about a secret feature in windows.

Windows Secret Feature.

In this article we are going to discuss about method to protect your computer from unauthorized access.
This method is personally used by me and I thought I should share this.
On all Windows computers, the SAM contains user account name and
password information. The password information is kept in a scrambled format such
that it cannot be unscrambled using known techniques . The scrambling procedure is called a
one-way function (OWF), or hashing algorithm, and it results in a hash value that cannot
be decrypted. We will refer to the password hashes a great deal in this book. The SAM
makes up one of the five Registry hives and is implemented in the file %systemroot%\
On Windows Server 2000 and later domain controllers, user account/hash data for
the domain is kept in the Active Directory (%systemroot%\ntds\ntds.dit, by default).
The hashes are kept in the same format, but they must be accessed via different means.

Under NT, password hashes were stored directly in the SAM file. Starting with NT 4
Service Pack 3, Microsoft provided the ability to add another layer of encryption to the
SAM hashes, called SYSKEY. SYSKEY, short for SYStem KEY, essentially derived a
random 128-bit key and encrypted the hashes again (not the SAM file itself, just the
hashes). To enable SYSKEY on NT 4, you have to run the SYSKEY command, which
presents a window like the following:

Clicking the Update button in this window presents further SYSKEY options, namely
the ability to determine how or where the SYSKEY is stored. The SYSKEY can be stored
in one of three ways:
• Mode 1 Stored in the Registry and made available automatically at boot time
(this is the default)
• Mode 2 Stored in the Registry but locked with a password that must be
supplied at boot time
• Mode 3 Stored on a fl oppy disk that must be supplied at boot time


Window, Windows, Windows 7, Windows 8, Windows Secure, Windows Vista, Windows Xp

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