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Windows Vista and later versions of Windows disable LM hash by default. Note: enabling this setting does not immediately clear the LM hash values from the SAM, but rather enables an additional check during password change operations that will instead store a "dummy" value in the location in the SAM database where the LM hash is otherwise stored.
This is a benefit when editing keys manually using regedit.exe, the built-in Windows Registry Editor. Because user-based registry settings are loaded from a user-specific path rather than from a read-only system location, the registry allows multiple users to share the same machine, and also allows programs to work for less privileged users.
The machine SID (S-1-5-21) is stored in the SECURITY registry hive located at SECURITY\SAM\Domains\Account, this key has two values F and V. The V value is a binary value that has the computer SID embedded within it at the end of its data (last 96 bits). [20] (Some sources state that it is stored in the SAM hive instead.)
Screenshot of the Syskey utility on the Windows 8.1 operating system requesting the user to enter a password.. The SAM Lock Tool, better known as Syskey (the name of its executable file), is a discontinued component of Windows NT that encrypts the Security Account Manager (SAM) database using a 128-bit RC4 encryption key.
In Windows Vista, Windows 7 and Windows 10, System File Checker is integrated with Windows Resource Protection (WRP), which protects registry keys and folders as well as critical system files. Under Windows Vista, sfc.exe can be used to check specific folder paths, including the Windows folder and the boot folder.
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File system driver that provides file system-level encryption Windows 2000: Security Account Manager: Database stored as a registry file Windows NT 3.1: SYSKEY: Utility that encrypts the hashed password information in a SAM database using a 128-bit encryption key Windows NT 4.0 Service Pack 3 User Account Control
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