One-Time Passwords(OTP Two parties share a list of one-time passwords Time synchronized OTP 35912喜 Example: MACK(t) where t is the RSA Secur|D⑤ current time b Using a hash chain (Proposed by Lamport) H(s),H(H(s),,,H15) 13 Use these hash values in reverse orderOne-Time Passwords (OTP) • Two parties share a list of one-time passwords • Time synchronized OTP • Example: MACK(t) where t is the current time • Using a hash chain (Proposed by Lamport) • H(s), H(H(s)), …, H1000(s) • Use these hash values in reverse order Topic 3: User Authentication 132/3/2021