บทความเขียนใน Link นี้ https://medium.com/practists/%E0%B8%AA%E0%B8%A3%E0%B9%89%E0%B8%B2%E0%B8%87-certificates-%E0%B8%94%E0%B9%89%E0%B8%A7%E0%B8%A2-openssl-%E0%B9%81%E0%B8%9A%E0%B8%9A-%E0%B9%81%E0%B8%9B%E0%B9%8A%E0%B8%9A%E0%B9%80%E0%B8%94%E0%B8%B5%E0%B8%A2%E0%B8%A7%E0%B9%80%E0%B8%82%E0%B9%89%E0%B8%B2%E0%B9%83%E0%B8%88-cc08d8617b96