Secure attention key
A secure attention key (SAK) or secure attention sequence (SAS) is a special key or key combination to be pressed on a computer keyboard before a login screen which must, to the user, be completely trustworthy. The operating system kernel, which interacts directly with the hardware, is able to detect whether the secure attention key has been pressed. When this event is detected, the kernel starts the trusted login processing.
The secure attention key is designed to make login spoofing impossible, as the kernel will suspend any program, including those masquerading as the computer's login process, before starting a trustable login operation.
Examples
Some examples are:
- Ctrl+Alt+Delete for Windows NT.
- Alt+SysRq+K default sequence for Linux.[1] Not a true C2-compliant SAK.[2]
gollark: The canvas, at least, is mostly standardized by now.
gollark: Well, see, it decreases unemployment because people can work on robot development, but it increases unemployment because robots theoretically might put people out of work.
gollark: Or just two governments competing on the free market. But controlling the same land area.
gollark: We should have two monopoly commissions which compete for the... monopoly... removal... market?
gollark: I wonder if the game lets you create an anarchocapitalist paradise.
See also
References
- Andrew Morton (2001-03-18). "Linux 2.4.2 Secure Attention Key (SAK) handling". Linux Kernel Organization. Retrieved 2011-05-30.
- "Linux Magic System Request Key Hacks". kernel.org. 2013-08-12. Retrieved 2017-05-21.
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