slowtrain2013 https://blog.hatena.ne.jp/slowtrain2013/ 叡智の三猿 https://www.three-wise-monkeys.com/ A to Z Information Security 気になる情報セキュリティ用語 文学・語学 サーバーとネットワーク X.509: The Digital ID Card X.509 is a standard format for digital certificates — like an official ID card that proves a website or a service is who they say they are on the internet. What is X.509? Imagine someone says "Hi, I'm the real bank.com!" How do you know they're telling the truth? An X.509 … 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fwww.three-wise-monkeys.com%2Fentry%2F2026%2F07%2F29%2F080000" title="X.509（デジタル証明書標準フォーマット）：A to Z Information Security - 叡智の三猿" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> https://cdn-ak.f.st-hatena.com/images/fotolife/s/slowtrain2013/20251109/20251109125205.png Hatena Blog https://hatena.blog 2026-07-29 08:00:00 rich https://www.three-wise-monkeys.com/entry/2026/07/29/080000 1.0 100%