... integrity❍key distribution security in practice:❍firewalls security in application, transport, network, link layers 8: Network Security8 -3Chapter 8 roadmap8.1 What is network security? 8.2 Principles ... Kurose, Keith RossAddison-Wesley, July 2004. 8: Network Security8 -2Chapter 8: Network SecurityChapter goals: ❒understand principles of network security: ❍cryptography and its many uses beyond “confidentiality”❍authentication❍message ... certification8.6 Access control: firewalls8.7 Attacks and counter measures8.8 Security in many layers 8: Network Security8 -4What is network security? Confidentiality: only sender, intended receiver should...