The lsass.exe process is included with Microsoft Windows and works to enforce the security policy on your system. It is responsible for verification when a user logs in, their password, and also access tokens to allow or prevent a user from accessing specific files or locations on the system. The process is also responsible for writing to the Windows Security Log.
If this file is ever stopped, your machine will need to be rebooted to resume normal system function.
Application: Local Security Authority Subsystem Service
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