CTF (Capture the Flag) Writeups
Part of the Cybersecurity Roadmap
In short
Solving a CTF is fun. Writing it up clearly is what gets you hired. A good writeup shows how you think, including the dead ends, not just the final flag.
Detailed writeups of Capture the Flag challenges you've solved — demonstrating your problem-solving process, not just the final answer, is what makes a writeup valuable to a reviewer.
Think of it like this
Show your working in maths
In school maths, the teacher gave marks for the steps, not just the final answer. A correct answer with no working looked like copying. CTF writeups work the same way: your method, reasoning and what you learnt matter more than the flag.
Watch it happen
Shape of a strong writeup
1/5Name the platform, the challenge and its category, and link to it. Only publish writeups the platform allows.
The big ideas
What you need to know
Follow platform rules
Hack The Box allows public writeups only for retired content. Check each platform's rules before publishing.
Teach, do not brag
Write so a beginner could follow and learn. Clear teaching stands out to hiring managers.
Add the defence
A short how to fix it section shows you think like a professional, not only a player.
Consistent format
Use the same template for every writeup. A tidy series looks far better than scattered notes.
See it in code
Walk through the code
1# <Challenge name> (platform, category, difficulty)2Date solved: 2026-10-123Allowed to publish: yes (retired / event ended)4 5## Summary 2 lines: what it was, what you learnt6## Recon what you checked first and why7## Dead ends what failed and what it taught you8## Solution the key insight, step by step9## Defence how a real system would prevent / detect this10## References docs or tools you used1/3Header with context and a clear note that publishing is allowed.
A reusable template. Filling the Dead ends and Defence sections is what separates a learning writeup from a bare answer dump.
Save yourself the pain
Common mistakes
Oops
Posting a writeup for an active challenge.
Do this instead
Wait until it is retired or the event ends. Spoiling live challenges breaks rules and burns goodwill.
Oops
Only posting the final commands with no explanation.
Do this instead
Explain why each step made sense. Recruiters want your thought process.
Your mission
Publish your first writeup
Quick check
What makes a CTF writeup most valuable to a hiring manager?
Go deeper
- 1Complete 3-5 CTF challenges across different categories (web, crypto, forensics).
- 2Write detailed walkthroughs explaining your reasoning at each step, not just the solution.
- 3Publish your writeups publicly (GitHub or a blog) to build a visible track record.
More projects at this stop
Home Lab Setup & Network Segmentation Project
Vulnerability Assessment Report
Security Automation Script Project
SIEM Dashboard & Detection Rules Project
Incident Response Tabletop Writeup
Portfolio Website or GitHub Showcase
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