--- title: "#ctf articles | Hashnode" description: "Capture the flag. Read the latest #ctf articles and tutorials on Hashnode." url: "https://hashnode.com/tag/ctf" --- Tag # #ctf 828 posts · 103 followers [Molly Sohaney](https://hashnode.com/@mollysohaney) · [2d ago](https://hashnode.com/posts/ctf-writeup-lottery-blockchain-css-ctf-2026-return-of-nexus/6af26e99a7de4158d8216f11) ### [CTF Writeup: Lottery | Blockchain | CSS CTF 2026: Return of Nexus](https://mollysohaney.hashnode.dev/ctf-writeup-lottery-blockchain-css-ctf-2026-return-of-nexus?utm_source=hashnode&utm_medium=feed) Description Beyond the checkpoint, a Beltway Bandits gambling terminal has resumed broadcasting: "Ten wins in a row. One fortune. No second chances." Once used to distribute stolen credits, it now ho 7 min read · [mollysohaney.hashnode.dev](https://mollysohaney.hashnode.dev/ctf-writeup-lottery-blockchain-css-ctf-2026-return-of-nexus?utm_source=hashnode&utm_medium=feed) [Molly Sohaney](https://hashnode.com/@mollysohaney) · [2d ago](https://hashnode.com/posts/ctf-writeup-gateway-blockchain-css-ctf-2026-return-of-nexus/6af26e57c91512e319693f60) ### [CTF Writeup: Gateway | Blockchain | CSS CTF 2026: Return of Nexus](https://mollysohaney.hashnode.dev/ctf-writeup-gateway-blockchain-css-ctf-2026-return-of-nexus?utm_source=hashnode&utm_medium=feed) Description The reboot has awakened an abandoned UPDC checkpoint guarding access to the Quantum Nexus Network. Its emergency gate still demands three proofs of clearance, but the officers who issued 7 min read · [mollysohaney.hashnode.dev](https://mollysohaney.hashnode.dev/ctf-writeup-gateway-blockchain-css-ctf-2026-return-of-nexus?utm_source=hashnode&utm_medium=feed) [Molly Sohaney](https://hashnode.com/@mollysohaney) · [2d ago](https://hashnode.com/posts/ctf-writeup-prince-walk-reverse-engineering-css-ctf-2026-return-of-nexus/6af26dfac91512e3196804cd) ### [CTF Writeup: Prince Walk | Reverse Engineering | CSS CTF 2026: Return of Nexus](https://mollysohaney.hashnode.dev/ctf-writeup-prince-walk-reverse-engineering-css-ctf-2026-return-of-nexus?utm_source=hashnode&utm_medium=feed) Description One year after The Severance silenced the Quantum Nexus Network, your terminal receives a transmission from the Kuiper Belt Relay. Hidden inside it is an abandoned Polaris Logistics recov 6 min read · [mollysohaney.hashnode.dev](https://mollysohaney.hashnode.dev/ctf-writeup-prince-walk-reverse-engineering-css-ctf-2026-return-of-nexus?utm_source=hashnode&utm_medium=feed) [Molly Sohaney](https://hashnode.com/@mollysohaney) · [2d ago](https://hashnode.com/posts/ctf-writeup-flappy-board-reverse-engineering-css-ctf-2026-return-of-nexus/6af26b58ff586ac0cc0bd178) ### [CTF Writeup: Flappy Board | Reverse Engineering | CSS CTF 2026: Return of Nexus](https://mollysohaney.hashnode.dev/ctf-writeup-flappy-board-reverse-engineering-css-ctf-2026-return-of-nexus?utm_source=hashnode&utm_medium=feed) Description The beacon reveals a stranded Polaris courier drone carrying a Nexus restoration packet. Its flight console, FLAPPY BOARD, still works, but corrupted departure timers hold it grounded and 10 min read · [mollysohaney.hashnode.dev](https://mollysohaney.hashnode.dev/ctf-writeup-flappy-board-reverse-engineering-css-ctf-2026-return-of-nexus?utm_source=hashnode&utm_medium=feed) [Molly Sohaney](https://hashnode.com/@mollysohaney) · [2d ago](https://hashnode.com/posts/ctf-writeup-colour-shift-forensics-css-ctf-2026-return-of-nexus/6af269c71ea7a90df35b4d0b) ### [CTF Writeup: Colour Shift | Forensics | CSS CTF 2026: Return of Nexus](https://mollysohaney.hashnode.dev/ctf-writeup-colour-shift-forensics-css-ctf-2026-return-of-nexus?utm_source=hashnode&utm_medium=feed) Description In 1666 Issac Newton split light into their compositve wavelengths. Can you? Flag format: CSSCTF{...} We're given: colorshiftctf.bmp Overview This challenge hands us a single bitmap o 5 min read · [mollysohaney.hashnode.dev](https://mollysohaney.hashnode.dev/ctf-writeup-colour-shift-forensics-css-ctf-2026-return-of-nexus?utm_source=hashnode&utm_medium=feed) [Molly Sohaney](https://hashnode.com/@mollysohaney) · [2d ago](https://hashnode.com/posts/ctf-writeup-ghost-frequency-forensics-css-ctf-2026-return-of-nexus/6af267798c0471ffe8679cde) ### [CTF Writeup: Ghost Frequency | Forensics | CSS CTF 2026: Return of Nexus](https://mollysohaney.hashnode.dev/ctf-writeup-ghost-frequency-forensics-css-ctf-2026-return-of-nexus?utm_source=hashnode&utm_medium=feed) Description KBR-17's maintenance black box survived The Severance, but its final transmission never reached the Nexus archive. Relay documentation says the recorder captured two maintenance channel 11 min read · [mollysohaney.hashnode.dev](https://mollysohaney.hashnode.dev/ctf-writeup-ghost-frequency-forensics-css-ctf-2026-return-of-nexus?utm_source=hashnode&utm_medium=feed) [justcurious](https://hashnode.com/@blackboxctf) · [Nov 5](https://hashnode.com/posts/how-to-start-learning-cybersecurity-with-blackboxctf/6aecaa58261fdcf8bad90796) ### [How to Start Learning Cybersecurity With BlackBoxCTF](https://blackboxctf.hashnode.dev/how-to-start-learning-cybersecurity-with-blackboxctf?utm_source=hashnode&utm_medium=feed) 30 Cybersecurity Roadmap featured on our blog 4 min read · [blackboxctf.hashnode.dev](https://blackboxctf.hashnode.dev/how-to-start-learning-cybersecurity-with-blackboxctf?utm_source=hashnode&utm_medium=feed) [justcurious](https://hashnode.com/@blackboxctf) · [Nov 3](https://hashnode.com/posts/how-to-host-cybersecurity-ctf-event-blackboxctf/6ae9e29860ca40fad688cc78) ### [How to Host a Cybersecurity CTF Event Using BlackBoxCTF](https://blackboxctf.hashnode.dev/how-to-host-cybersecurity-ctf-event-blackboxctf?utm_source=hashnode&utm_medium=feed) Best CTF hosting for college and corporate events 3 min read · [blackboxctf.hashnode.dev](https://blackboxctf.hashnode.dev/how-to-host-cybersecurity-ctf-event-blackboxctf?utm_source=hashnode&utm_medium=feed) [Anirudh](https://hashnode.com/@redtrib3) · [Nov 3](https://hashnode.com/posts/smarthire-hackthebox-writeup/6aea22dca01113fbb564430e) ### [SmartHire - hackthebox writeup](https://blog.redtrib3.in/smarthire-hackthebox-writeup?utm_source=hashnode&utm_medium=feed) Introduction Smarthire is a medium rated machine in hackthebox released off-season. This is the first box I submitted to hackthebox and was approved. I expected it to be approved as an easy box, but h 11 min read · [blog.redtrib3.in](https://blog.redtrib3.in/smarthire-hackthebox-writeup?utm_source=hashnode&utm_medium=feed) [justcurious](https://hashnode.com/@blackboxctf) · [Oct 31](https://hashnode.com/posts/how-blackboxctf-s-classroom-concept-can-support-peer-to-peer-teaching/6ae60181542ad58c9d88278e) ### [How BlackBoxCTF’s Classroom Concept Can Support Peer-to-Peer Teaching](https://blackboxctf.hashnode.dev/how-blackboxctf-s-classroom-concept-can-support-peer-to-peer-teaching?utm_source=hashnode&utm_medium=feed) A Better Experience for College Students 3 min read · [blackboxctf.hashnode.dev](https://blackboxctf.hashnode.dev/how-blackboxctf-s-classroom-concept-can-support-peer-to-peer-teaching?utm_source=hashnode&utm_medium=feed)