OSINT: learn the method, then check your own footprint

Open-source intelligence (OSINT) is finding answers in what is already public: a review, a photo, a song, a page someone forgot to take down. The skill is the pivot from one small clue to the next.

The walkthroughs here practise it on CyberGym's OSINT challenges, where the people are fictional and searching is the point. Each one ends by turning the method around: what the same steps would find about you or your company, and how to close it.

CTF Mode works through OSINT challenges with you on a practice target, keeping each clue it finds in its Memory tab.

Articles

• OSINT CTF walkthrough: reset a password with a security question

  How an OSINT CTF challenge resets an account by answering its security question from public clues — the alias-pivoting method, how the walkthrough reasoned through it, and why security questions are weak for your own accounts.

• OSINT on your own company: what is public, and the tools to find it

  Run OSINT on your own domain before someone else does: which public sources to check, which tools a beginner should learn first, and what one real pass on hackergpt.app turned up.

• Crypto Analysis OSINT

  Streamline blockchain investigations with HackerGPT. Learn how to automate token auditing, wallet forensics, and OFAC compliance screening in a unified interface.