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When the Source Attacks Back: Prompt Injection Is Coming for OSINT
AI can help investigators move faster. It can also be manipulated by the sources it reads. This practical guide shows how prompt injection enters OSINT workflows, how to detect hidden instructions in webpages, PDFs and spreadsheets, and how to preserve, test and report the evidence. Includes a hands-on CTF lab with three realistic files to investigate.

Nico Dekens | dutch_osintguy
5 days ago22 min read


OSINT - Cities with hundreds of names | How OSINT investigators miss hidden clues
You think you know Amsterdam? You don’t. Even if you’re born and raised there. For OSINT investigators, analysts, and journalists, searching only for “Amsterdam” means missing half the signal. The city hides behind slang, symbols, codes, and multilingual aliases. This post shows how language masks location, why alias awareness matters, and how Boolean and regex uncover Amsterdam’s hidden digital footprint across the open web, social media, and the dark web.

Nico Dekens | dutch_osintguy
Jan 210 min read


What OSINT Really Is - And Why AI Keeps Getting It Wrong
OSINT isn’t about collecting public data, AI already does that better than humans. OSINT is about pressure-testing reality. In digital investigations, organisational security, and business risk, OSINT turns fragmented public signals into defensible understanding. As AI increases visibility but not judgment, OSINT remains a human discipline: questioning sources, timelines, intent, and absence. This article breaks down what OSINT really is, how it’s used, why businesses rely on

Nico Dekens | dutch_osintguy
Dec 22, 20254 min read
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