https://robertaugustinus.com/ Cryptography, systems, and what happens below the abstraction. Mon, 26 Oct 2026 14:06:43 +0000 https://robertaugustinus.com/2026/the-key-was-four.html https://robertaugustinus.com/2026/the-key-was-four.html Thu, 22 Oct 2026 00:00:00 +0000 A certificate authority trusted by every major browser turned out to have keys you could guess in milliseconds. Browsers caught it in hours. Here is what the same mistake would look like inside Europe's digital identity wallet. https://robertaugustinus.com/2026/claude-code-deny-list.html https://robertaugustinus.com/2026/claude-code-deny-list.html Fri, 04 Sep 2026 00:00:00 +0000 Why ~/.claude/settings.json is not good enough as a security boundary and you should isolate Claude code completely. https://robertaugustinus.com/2026/homoiconic-critical-software.html https://robertaugustinus.com/2026/homoiconic-critical-software.html Mon, 01 Jun 2026 00:00:00 +0000 Why critical software is structurally unauditable, and what homoiconicity has to do with it