ACM transactions on computer systems (February) by D. R. Kuhn on corporate internet, B. Bertino on

By D. R. Kuhn on corporate internet, B. Bertino on authorization constraints, V. Bhamidipati and others M. Nyanchama and S. Osborn on the role graph model, Ravi Sandhu

Significant reviews by way of prime foreign machine scientists. it is a exact factor on Role-Based entry keep an eye on.

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Application-level logs such as Apache’s log of HTTP requests are semantically rich. However, they provide no information about the attacker’s own programs, and they can be disabled by an attacker who gains privileged access. Networklevel logs provide more information for remote attacks, but they can be rendered useless by encryption or obfuscation. Logging low-level events such as machine instructions can provide complete information about the computer’s execution [Dunlap et al. 2002], but these can be difficult for administrators to understand quickly.

Probability that the adversary plays the game but neither wins nor loses. Each curve corresponds to a different level of friend bias. Fig. 11. Time from start of nuisance attack to first alarm at any peer ( y axis) versus the number of peers subverted (x axis), for varying adversary resource sizes. Some attacks with few subverted peers do not cause alarms on our timescale. illustrates that the stealth modification adversary is playing a high-risk, highreward game: to have any chances of success (no more than 36% at best), he has to suffer very high levels of risk.

This caused lurking to take him longer. ACM Transactions on Computer Systems, Vol. 23, No. 1, February 2005. 32 • P. Maniatis et al. Fig. 3. Minimum time for the stealth adversary to achieve various foothold ratios, starting with various proportions of initially subverted peers. We show graphs for 10, 20, 30, and 40% friend bias. and damage achieved, both of which the adversary wishes to maximize. These two adversary subgoals are, however, conflicting since the greater the damage inflicted on loyal peers’ AU replicas, the greater the chance an inconclusive alarm may be raised, and conversely, avoiding inconclusive alarms may mean limiting damage inflicted on loyal peers’ AU replicas.

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