{"url":"https://www.three-wise-monkeys.com/entry/2026/07/29/080000","description":"X.509: The Digital ID Card X.509 is a standard format for digital certificates \u2014 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 \u2026","provider_name":"Hatena Blog","published":"2026-07-29 08:00:00","categories":["A to Z Information Security","\u6c17\u306b\u306a\u308b\u60c5\u5831\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u7528\u8a9e","\u6587\u5b66\u30fb\u8a9e\u5b66","\u30b5\u30fc\u30d0\u30fc\u3068\u30cd\u30c3\u30c8\u30ef\u30fc\u30af"],"blog_url":"https://www.three-wise-monkeys.com/","image_url":"https://cdn-ak.f.st-hatena.com/images/fotolife/s/slowtrain2013/20251109/20251109125205.png","type":"rich","author_url":"https://blog.hatena.ne.jp/slowtrain2013/","version":"1.0","blog_title":"\u53e1\u667a\u306e\u4e09\u733f","author_name":"slowtrain2013","provider_url":"https://hatena.blog","height":"190","title":"X.509\uff08\u30c7\u30b8\u30bf\u30eb\u8a3c\u660e\u66f8\u6a19\u6e96\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\uff09\uff1aA to Z Information Security","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fwww.three-wise-monkeys.com%2Fentry%2F2026%2F07%2F29%2F080000\" title=\"X.509\uff08\u30c7\u30b8\u30bf\u30eb\u8a3c\u660e\u66f8\u6a19\u6e96\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\uff09\uff1aA to Z Information Security - \u53e1\u667a\u306e\u4e09\u733f\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","width":"100%"}