{"url":"https://kazu-yamamoto.hatenablog.jp/entry/2025/03/12/193201","blog_url":"https://kazu-yamamoto.hatenablog.jp/","blog_title":"\u3042\u3069\u3051\u306a\u3044\u8a71","width":"100%","type":"rich","author_url":"https://blog.hatena.ne.jp/kazu-yamamoto/","description":"ECH(Encrypted Client Hello) \u3068\u306f\u4f55\u304b TLS 1.3\u306e\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u306f\u3001EncryptedExtensions\u304b\u3089\u6697\u53f7\u5316\u3055\u308c\u308b\u304c\u3001\u305d\u308c\u3088\u308a\u524d\u306eClientHello \u3068 ServerHello\u306f\u5e73\u6587\u306e\u307e\u307e\u3067\u4ea4\u63db\u3055\u308c\u308b\u3002ClientHello\u306b\u542b\u307e\u308c\u308bSNI(Server Name Indication\u3001\u30b5\u30fc\u30d0\u540d)\u306f\u3001\u7279\u306b\u30d7\u30e9\u30a4\u30d0\u30b7\u6027\u304c\u9ad8\u3044\u3002\u5358\u306b\u3053\u306eSNI\u3092\u6697\u53f7\u5316\u3059\u308b\u65b9\u6cd5\u3068\u3057\u3066\u3001\u521d\u671f\u306fESNI(Encrypted Server Name Indication)\u304c\u63d0\u6848\u3055\u308c\u3066\u3044\u305f\u3002\u3057\u304b\u3057\u3001\u305d\u306e\u5f8cClientHello\u81ea\u4f53\u3092\u6697\u53f7\u5316\u3059\u308bECH(Encrypted Client\u2026","author_name":"kazu-yamamoto","categories":["TLS"],"image_url":null,"published":"2025-03-12 19:32:01","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fkazu-yamamoto.hatenablog.jp%2Fentry%2F2025%2F03%2F12%2F193201\" title=\"Encrypted Client Hello \u306e\u4ed5\u69d8 - \u3042\u3069\u3051\u306a\u3044\u8a71\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","version":"1.0","title":"Encrypted Client Hello \u306e\u4ed5\u69d8","provider_name":"Hatena Blog","height":"190","provider_url":"https://hatena.blog"}