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x - Faculty of Computer Science - Technische Universität Dresden

x - Faculty of Computer Science - Technische Universität Dresden

area of

area of physical control of the attacker Observing vs. modifying attacker world world IT-system under consideration area of physical control of the attacker IT-system under consideration observing attacker modifying attacker acting according to the agreed rules possibly breaking the agreed rules 42

Strength of the attacker (model) Attacker (model) A is stronger than attacker (model) B, iff A is stronger than B in at least one respect and not weaker in any other respect. Stronger means: – set of roles of A � set of roles of B, – area of physical control of A � area of physical control of B, – behavior of the attacker • active is stronger than passive • modifying is stronger than observing – intelligent is stronger than stupid • computing capacity: not restricted is stronger than restricted – more money means stronger – more time means stronger Defines partial order of attacker (models). 43

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