protocol-analysislisted

# Protocol Analysis ## Purpose Model cryptographic protocols as state machines, enumerate state transitions, and identify vulnerabilities including desynchronization, replay attacks, downgrade attacks, and session binding failures. ## Scope Constraints Reads protocol specifications, message sequence diagrams, and implementation source code. Does not modify files or execute code. Does not interact with live protocol endpoints or perform active testing. ## Inputs - Protocol specification or implementation under analysis - Message sequence diagrams or protocol description - Participant roles and trust relationships - Security properties the protocol should provide (authentication, confidentiality, integrity, forward secrecy) - Deployment context (network model, adversary capabilities) ## Input Sanitization No user-provided values are used in commands or file paths. All inputs are treated as read-only analysis targets. ## Procedure ### Step 1: Model Protocol State Machine Define the protocol as a state machine for each participant: - Enumerate all states (initial, waiting, authenticated, established, error, closed) - Define all valid transitions with triggering messages - Identify terminal states and error recovery paths - Document state variables maintained at each state (keys, nonces, sequence numbers) ### Step 2: Enumerate State Transitions For each state transition, document: - Triggering condition (message received, timeout, local event) - Validation checks performe