Network Security: Network Security and Network Protocols

Goals

• Network Protocols
  • Understand security protocol design goals
  • Appreciate difficulty of protocol design
  • Internalize best practices
  • Understand properties and limitations of standard protocols

Protocol Basics

• What properties do security protocols provide?
• What is a typical adversary model?
• What properties might we expect from an authentication protocol?

Protocol Flaws

• How does the Needham-Schroeder attack work?
• How does a type-flaw attack work?
• How can an adversary exploit parallel sessions to attack a protocol?
• What are the core design principles for creating a secure protocol?
• Should you design your own protocol?
• What tools are available to vet security protocols?

TLS

• What are the security goals for TLS?
• Where is it used?
• Why is it so complex?
• Explain the different phases of the TLS handshake
• What assumptions are necessary for TLS to be secure?
• How secure is TLS in practice?