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x - Faculty of Computer Science - Technische Universität Dresden

x - Faculty of Computer Science - Technische Universität Dresden

Password based

Password based authentication • security problem – replay attack • possible solution: challenge-response protocol User – tries to ensure freshness • remaining problems: – Man-in-the-middle attacks – parallel protocol runs random challenge c response f(c , secret) Server 97

Password based authentication • security problem – MITM / parallel protocol runs User Server 1.2’ random challenge c’ 1.3 response f(c’ , secret) 1.1 login request (dog) 2.1 login request (dog) 1.2 random challenge c 2.2 random challenge c’ 2.3 response f(c’ , secret) 98

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