protocol-analysis

Model cryptographic protocols as state machines to enumerate transitions and identify vulnerabilities.

1|1|Updated Feb 21, 2026
One-click install
npx skills add https://github.com/dtsong/claude-code-windows-setup --skill protocol-analysis
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: protocol-analysis
Source: https://github.com/dtsong/claude-code-windows-setup/tree/main/skills/council/cipher/protocol-analysis
Command: npx skills add https://github.com/dtsong/claude-code-windows-setup --skill protocol-analysis

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill helps identify vulnerabilities in cryptographic protocols by systematically modeling their behavior and analyzing potential weaknesses.

Core Features & Use Cases

  • State Machine Modeling: Visualize protocol states and transitions.
  • Vulnerability Identification: Detect issues like replay attacks, desynchronization, and downgrade attacks.
  • Use Case: Analyze the TLS handshake to ensure it correctly handles session resumption and prevents man-in-the-middle attacks.

Quick Start

Analyze the provided protocol specification to identify potential replay vulnerabilities.

Frequently Asked Questions about protocol-analysis

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I analyze cryptographic protocols for desynchronization and replay vulnerabilities?

To analyze cryptographic protocols for desynchronization and replay vulnerabilities, you model the protocol as a state machine to systematically enumerate state transitions and identify session binding weaknesses. This reveals potential attack paths.

What is the best way to detect downgrade attacks during a TLS handshake?

Detecting downgrade attacks during a TLS handshake involves modeling protocol negotiation integrity as a state machine. This approach ensures the handshake prevents man-in-the-middle attacks and correctly handles session resumption.

Can I use state machine modeling to find session management vulnerabilities?

Yes, you can use state machine modeling to find session management vulnerabilities. Visualizing protocol states and transitions systematically exposes session binding issues and potential replay attack vectors.

Does protocol analysis cover implementation-level crypto review or post-quantum assessment?

Protocol analysis does not cover implementation-level crypto review or post-quantum assessment. It focuses strictly on modeling protocol handshakes, session management, and negotiation integrity to identify design-level flaws.

Why does modeling protocol states help prevent man-in-the-middle attacks?

Modeling protocol states helps prevent man-in-the-middle attacks by visualizing protocol transitions and verifying negotiation integrity. This systematic enumeration highlights desynchronization and session binding flaws exploited by attackers.

How do I check if my protocol specification handles session binding correctly?

To check if a protocol specification handles session binding correctly, you analyze the provided specification to model its state transitions. This identifies potential replay vulnerabilities and ensures secure session management.