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x - Faculty of Computer Science - Technische Universität Dresden

x - Faculty of Computer Science - Technische Universität Dresden

a) key (total break)

a) key (total break) Goal/success of attack b) procedure equivalent to key (universal break) c) individual messages, e.g. especially for authentication systems c1) one selected message (selective break) c2) any message (existential break) 139

severity a) passive a1) ciphertext-only attack a2) known-plaintext attack b) active Types of attack (according to encryption system; asym.: either b1 or b2; sym.: b1 or b2) b1) signature system: plaintext � ciphertext (signature) (chosen-plaintext attack) b2) encryption system: ciphertext � plaintext (chosen-ciphertext attack) adaptivity not adaptive adaptive criterion: action permission passive attacker � observing attacker active attacker � modifying attacker 140

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