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Many current real-world computer security efforts focus on external threats, and generally treat the computer system itself as a trusted system. Some knowledgeable observers consider this to be a disastrous mistake, and point out^* that this distinction is the cause of much of the insecurity of current computer systems. once an attacker has subverted one part of a system without fine-grained security, he or she usually has access to most or all of the features of that system Because computer systems can be very complex, and cannot be guaranteed to be free of defects, this security stance tends to produce insecure systems.

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