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Local Security Authority Subsystem Service (LSASS) [1] is a process in Microsoft Windows operating systems that is responsible for enforcing the security policy on the system. It verifies users logging on to a Windows computer or server, handles password changes, and creates access tokens. [2]
In older versions of Windows NT, the password could only be stored in plain text in the registry; support for using the Local Security Authority's private storage capabilities was introduced in Windows NT 4.0 Workstation Service Pack 3 and Windows NT Server 3.51.
Winlogon is launched by the Session Manager Subsystem as a part of the booting process of Windows NT.. Before Windows Vista, Winlogon was responsible for starting the Service Control Manager and the Local Security Authority Subsystem Service, but since Vista these have been launched by the Windows Startup Application (wininit.exe).
Local Security Authority Subsystem Service writes events to the log. The Security Log is one of the primary tools used by Administrators to detect and investigate attempted and successful unauthorized activity and to troubleshoot problems; Microsoft describes it as "Your Best and Last Defense". [1]
The Local Security Authority Subsystem Service (LSASS), Session Manager (SMSS), and Service Control Manager all use (A)LPC ports directly to communicate with client processes. Winlogon and the Security Reference Monitor use it to communicate with the LSASS process.
Security Support Provider Interface (SSPI) is a component of Windows API that performs security-related operations such as authentication. SSPI functions as a common interface to several Security Support Providers (SSPs): [ 1 ] A Security Support Provider is a dynamic-link library (DLL) that makes one or more security packages available to apps.
It allowed the user name, domain name, and password hashes cached in memory by the Local Security Authority to be changed at runtime after a user was authenticated — this made it possible to 'pass the hash' using standard Windows applications, and thereby to undermine fundamental authentication mechanisms built into the operating system.
The Security Account Manager (SAM) is a database file [1] in Windows NT, Windows 2000, Windows XP, Windows Vista, Windows 7, 8.1, 10 and 11 that stores users' passwords. It can be used to authenticate local and remote users. Beginning with Windows 2000 SP4, Active Directory authenticates remote users.