Protocol Design and Message Flow Questions

Addresses design and analysis of communication and security protocols, with emphasis on message sequencing, participant roles, and what each party learns at each step. Key areas include modeling protocol flows, reasoning about authentication and key exchange, basic public key techniques such as Diffie Hellman key agreement, detecting incorrect ordering or missing steps, threat models and attack vectors that exploit message flow, and explaining why specific steps are required to achieve properties such as confidentiality, integrity, authenticity, and forward secrecy.