http://phinguin.dev/tags/openssl/ Recent content in Openssl on phinguin123 Hugo en-us 2026 phinguin Thu, 26 Mar 2026 12:12:00 +0900 http://phinguin.dev/blog/what-ssl-certificate-files-actually-do/ Thu, 26 Mar 2026 12:12:00 +0900 http://phinguin.dev/blog/what-ssl-certificate-files-actually-do/ cert.crt, chain_cert.crt, root_cert.crt and a .key. I’d installed them a dozen times without knowing why there were four, so I finally sat down and worked it out on my own server.