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Computer security protection rings.
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Protection rings are part of the trusted computing base concept.
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The closest physical analogy i can think of to the computing notion of rings of protection is the notion that you might have some people you trust to a large degree and with whom you share a lot of information and other people whom you trust to a lesser degree and with whom you share less information and perhaps others whom you trust even less and with whom you share even less information.
In a system which uses segmentation as a memory addressing scheme protection can be achieved in part by associating concentric rings of decreasing access privilege with a computation.
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In computer science hierarchical protection domains often called protection rings are mechanisms to protect data and functionality from faults by improving fault tolerance and malicious behavior by providing computer security.
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In real mode it was necessary since you only had 20 bit addressable memory.
It consists of diffusions surrounding the active components that are connected either to the power supply or to the ground.
In general if your system is armed and a potential security incident takes.
Protection rings against the latch up protect the integrated circuit from the triggering of a parasitic thyristor that can lead to the destruction of the circuit.
This approach is diametrically opposite to that of capability based security.
Protection of computations and information is an important aspect of a computer utility.
Back in the day it was possible to make exclusive sections of the memory space called segments.
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