replay-attack

Analyze PCAP network traffic to identify replay vulnerabilities in authentication flows.

Updated Apr 23, 2026
One-click install
npx skills add https://github.com/YukiIto1999/ctf-sleuth --skill replay-attack
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: replay-attack
Source: https://github.com/YukiIto1999/ctf-sleuth/tree/main/.claude/skills/replay-attack
Command: npx skills add https://github.com/YukiIto1999/ctf-sleuth --skill replay-attack

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Helps security teams analyze and reproduce replay attack vectors in controlled environments to assess the resilience of authentication flows and session management.

Core Features & Use Cases

  • Analyze captured traffic for replay opportunities across tokens, sessions, and API requests.
  • Reproduce replay sequences in a safe lab to validate anti-replay controls and response handling.
  • Provide countermeasure guidance such as nonce usage, short-lived credentials, and proper TLS implementations.

Quick Start

Run a replay attack analysis against a provided PCAP in your lab environment by loading the capture and configuring the attack parameters.

Frequently Asked Questions about replay-attack

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

FAQPage Schema
How do I analyze PCAP files for replay attack vulnerabilities?▼

Analyzing PCAP files for replay vulnerabilities involves inspecting captured network traffic to identify exposed authentication tokens and sessions that can be replayed. This Skill evaluates anti-replay defenses across HTTP, TLS, and TCP protocols.

How does a replay attack work against authentication flows?▼

A replay attack captures valid network traffic containing authentication tokens or session identifiers and retransmits them to impersonate a legitimate user. This Skill reproduces these sequences to validate anti-replay controls safely.

Can I test token and session replay using captured HTTP traffic?▼

Yes, you can test token and session replay using captured HTTP traffic by loading the PCAP into a controlled lab environment. This lets you craft replay payloads and evaluate how authentication flows handle repeated requests.

What is the best way to simulate replay attacks in a security assessment?▼

The best way to simulate replay attacks is using controlled lab tools to reproduce captured network traffic sequences against authentication flows. This Skill enables safe payload crafting and anti-replay defense evaluation during authorized security assessments.

What countermeasures prevent replay attacks in network security?▼

Effective countermeasures to prevent replay attacks include implementing nonce usage, short-lived credentials, and proper TLS implementations. This Skill provides guidance on these defenses after evaluating captured traffic and authentication flow resilience.