Notes on building Aegis: encryption, security and running a small service safely.

• Why we cannot read your vault
  20 Jul 2026

  Zero-knowledge is not a slogan. Here is the actual key hierarchy.

• Five layers against bots on one contact form
  20 Jul 2026

  A CAPTCHA is about 20% of the job. Here are the other four layers.

• The metadata we can still see (and why we say so)
  20 Jul 2026

  Professionals state their limits. Amateurs claim perfection.