Chapter 7: Network Security Chapter goals: O understand principles of network security o cryptography and its many uses beyond confidentiality o authentication o message integrity o key distribution O security in practice o firewalls o security in application transport network link layers Network Security 7-2Network Security 7-2 Chapter 7: Network Security Chapter goals:  understand principles of network security:  cryptography and its many uses beyond “confidentiality”  authentication  message integrity  key distribution  security in practice:  firewalls  security in application, transport, network, link layers