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In the case of online attacks, it is not possible to simply copy the SAM file to another location. The SAM file cannot be moved or copied while Windows is running, since the Windows kernel obtains and keeps an exclusive filesystem lock on the SAM file, and will not release that lock until the operating system has shut down or a "Blue Screen of ...
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.
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
Registry and other configuration files: SYSTEM.DAT, USER.DAT - Contains the Windows Registry; MSDOS.SYS - Contains some low-level boot settings and resources such as disabling double-buffering and the GUI logo; WIN.INI and SYSTEM.INI - Configuration files from Windows 3.1 which are processed in Windows 9x also
Security Identifier (SID) is a unique, immutable identifier of a user account, user group, or other security principal in the Windows NT family of operating systems. A security principal has a single SID for life (in a given Windows domain), and all properties of the principal, including its name, are associated with the SID.
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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.
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