Introduction Cryptographic protocol Distributed algorithm To achieve a security related goal cks Based on cryptographic building ble Examples Entity Authentication Key establishment: Key Distribution(Key enveloping Key transport), Key agreement Electronic Payment 22 Introduction • Cryptographic protocol – Distributed algorithm – Based on cryptographic building blocks – To achieve a security related goal • Examples: – Entity Authentication – Key Establishment:Key Distribution(Key enveloping, Key transport), Key agreement – Electronic Payment – …