Security

Using Keys and Certificates

Quick notes on OpenSSL, PEM/DER/CER formats, and practical tips.

Mar 9, 2022

About .DS_Store on Mac

This post explains what .DS_Store is on Mac, why it can be a security risk, and how to prevent it.

Aug 7, 2021

Clever Uses of Zero-Width Characters

Zero-width characters explained—types, how they hide data, and practical tools for watermarking or evading naive filters.

Mar 8, 2021