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Teo Parashkevov
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#pki

Everything I have written tagged #pki, newest first.

2 posts

2026

2 posts

  • Title card reading "Owning the Edge, Part 7: Rebuilding an OpenVPN PKI" with the subtitle "With easy-rsa", over a dark blue background with a network of connected nodes
    Security

    Owning the Edge - Rebuilding an OpenVPN PKI with easy-rsa

    Building a new certificate authority for my OpenVPN fallback with easy-rsa, choosing validity periods, staging the files with strict permissions, and replacing 150 lines of inlined certificates with five directives.

    5 min read
  • Title card reading "Owning the Edge, Part 6: When the CA Private Key Is Gone" with the subtitle "Auditing an inherited PKI", over a dark blue background with a network of connected nodes
    Security

    Owning the Edge - When the CA Private Key Is Gone

    Adding one phone to my OpenVPN fallback revealed that the private key of the old certificate authority no longer existed anywhere. How I searched for it, and the 30-second check that proves whether a certificate and a key belong together.

    4 min read