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x - Faculty of Computer Science - Technische Universität Dresden

x - Faculty of Computer Science - Technische Universität Dresden

Correlations between

Correlations between protection goals Confidentiality Hiding Integrity Availability Transitive closure to be added + implies strengthens + + Anonymity Unobservability Accountability Reachability Legal Enforceability – – weakens 58

Physical security assumptions Each technical security measure needs a physical “anchoring” in a part of the system which the attacker has neither read access nor modifying access to. Range from “computer centre X” to “smart card Y” What can be expected at best ? Availability of a locally concentrated part of the system cannot be provided against realistic attackers � physically distributed system … hope the attacker cannot be at many places at the same time. Distribution makes confidentiality and integrity more difficult. But physical measures concerning confidentiality and integrity are more efficient: Protection against all realistic attackers seems feasible. If so, physical distribution is quite ok. 60

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