Barry O'Callaghan

sec-headers: Audit Your Security Headers in One Command

me@barryocallaghan.com (Barry O'Callaghan) — Tue, 20 Oct 2026 00:00:00 +0000

Security headers are the cheapest defense you can deploy. They cost nothing, take minutes to configure, and block entire classes of attacks — XSS, clickjacking, MIME sniffing, SSL stripping. Yet most sites get them wrong, or don’t set them at all.

The Day Encryption Stops Working

me@barryocallaghan.com (Barry O'Callaghan) — Tue, 20 Oct 2026 00:00:00 +0000

This is Part 1 of the Post-Quantum Cryptography series — a plain-language guide to what’s coming, why it matters, and what to do about it.

Most security problems announce themselves. A suspicious login, a port left open, a file where it shouldn’t be. You get a signal, and usually a chance to respond.

vt-scanner: Check Any File Against VirusTotal in One Command

me@barryocallaghan.com (Barry O'Callaghan) — Tue, 20 Oct 2026 00:00:00 +0000

If you handle suspicious files — malware samples, email attachments, downloads from sketchy URLs — you’ve done the dance: hash the file, open VirusTotal, paste the hash, wait, repeat. It’s slow, manual, and burns your attention on process instead of analysis.

Projects

me@barryocallaghan.com (Barry O'Callaghan) — Mon, 01 Jan 0001 00:00:00 +0000

I build small, sharp, open-source security tools that solve problems I actually hit in the field. Each one is CLI-first, scriptable, and free — no SaaS dashboard, no browser extension, no signup. They slot into the same pipelines you already run.