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x - Faculty of Computer Science - Technische Universität Dresden

x - Faculty of Computer Science - Technische Universität Dresden

• One Time Password

• One Time Password One time password – only used to authenticate a single transation • Advantage – abuse of OTP becomes harder for the attacker • Implementations – list of OTPs • known from online banking: TAN, iTAN – on the fly generated and transmitted over a second channel • mTAN – time-synchronized (hardware) tokens: • token knows a secret s • OTP= f(s,time) – hash chain based 103

• OTP Implementations – hash chain based One time password • Leslie Lamport: “Password Authentication with Insecure Communication” • users generates hash chain: – h n (…h 3 (h 2 (h 1 (password)))) • users sends h n () as his “password” during register procedure • next login user sends h n-1 () • server verifies: h(h n-1 ()) = h n () • server now stores: h n-1 () 104

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