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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 – MITM / parallel protocol runs • possible solutions: – disallow parallel login protocol runs for the same user – make protocol runs distinguishable 99

Password based authentication • possible solution: distinguishable protocol runs User Server 2.1 login request (dog,r • cat) will not accept the same r multiple times 1.2’ random challenge c’ 1.3 response f(c’ , secret, r dog) 1.1 login request (dog,r dog) 1.2 random challenge c 2.2 random challenge c’ 2.3 response f(c’ , secret, r dog) 100

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