{"id":6942,"date":"2021-11-19T10:14:52","date_gmt":"2021-11-19T01:14:52","guid":{"rendered":"https:\/\/www.kagoya.jp\/howto\/?p=6942"},"modified":"2023-07-18T18:07:03","modified_gmt":"2023-07-18T09:07:03","slug":"dns-cache-poisoning","status":"publish","type":"post","link":"https:\/\/www.kagoya.jp\/howto\/engineer\/infosecurity\/dns-cache-poisoning\/","title":{"rendered":"DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u3068\u306f\uff1f\u5bfe\u7b56\u3084\u6700\u8fd1\u306e\u72b6\u6cc1\u3092\u89e3\u8aac"},"content":{"rendered":"\n<p>2008\u5e74\u9803\u306b\u767a\u751f\u3057\u305fDNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\uff08DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u6c5a\u67d3\uff09\u554f\u984c\u304c\u3001\u6700\u8fd1\u307e\u305f\u8a71\u984c\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002DNS\uff08\u30b5\u30fc\u30d0\u30fc\uff09\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u300c\u6c5a\u67d3\uff08\u6bd2\uff09\u300d\u3055\u308c\u308b\u3068\u4f55\u304c\u554f\u984c\u3067\u3001\u3069\u306e\u3088\u3046\u306b\u5bfe\u7b56\u304c\u53d6\u3089\u308c\u3066\u6765\u305f\u306e\u3067\u3057\u3087\u3046\u304b\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u305d\u306e\u6982\u8981\u3084\u5bfe\u7b56\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002\u3057\u3063\u304b\u308a\u5bfe\u5fdc\u3057\u306a\u3044\u3068\u3001\u81ea\u793e\u3067\u63d0\u4f9b\u3059\u308b\u30b5\u30fc\u30d3\u30b9\u306e\u4fe1\u983c\u3092\u640d\u306a\u3046\u6050\u308c\u304c\u3042\u308a\u307e\u3059\u3002\u5c02\u9580\u696d\u8005\u306b\u76f8\u8ac7\u3057\u3001\u5bfe\u7b56\u306f\u614e\u91cd\u306b\u9032\u3081\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1024\" height=\"655\" src=\"https:\/\/www.kagoya.jp\/howto\/wp-content\/uploads\/202111d_1.jpg\" alt=\"DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\" class=\"wp-image-6945\" srcset=\"https:\/\/www.kagoya.jp\/howto\/wp-content\/uploads\/202111d_1.jpg 1024w, https:\/\/www.kagoya.jp\/howto\/wp-content\/uploads\/202111d_1-300x192.jpg 300w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u3068\u306f\uff1f<\/h2>\n\n\n\n<p>\u96e3\u3057\u3044\u7528\u8a9e\u304c\u4e26\u3093\u3067\u3044\u307e\u3059\u3002\u300cDNS\u300d\u3068\u300c\u30ad\u30e3\u30c3\u30b7\u30e5\u300d\u306f\u30b5\u30fc\u30d0\u30fc\u3084PC\u306e\u52d5\u4f5c\u3067\u826f\u304f\u4f7f\u308f\u308c\u3066\u3044\u307e\u3059\u3002\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\uff08poisoning\uff09\u306b\u306f\u300c\u6bd2\u6bba\u300d\u306a\u3069\u6016\u3044\u610f\u5473\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u4eca\u56de\u306e\u5834\u5408\u3042\u308b\u6a5f\u80fd\u3092\u6b63\u5e38\u306b\u52d5\u304b\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u50cd\u304d\u3068\u8a00\u3044\u63db\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">DNS\uff08Domain Name System\uff09\u3068\u306f\uff1f<\/h3>\n\n\n\n<p><span class=\"kh-marker-blue\">Web\u30b5\u30a4\u30c8\u3092\u5229\u7528\u3059\u308b\u3068\u304d\u306b\u4f7f\u7528\u3059\u308b\u300c\u30c9\u30e1\u30a4\u30f3\u300d\uff08\u4f8b:kagoya.jp\uff09\u3068\u3001\u30b5\u30fc\u30d0\u30fc\u6a5f\u5668\u306e\u8b58\u5225\u756a\u53f7\u306e\u300cIP\u30a2\u30c9\u30ec\u30b9\u300d\uff08\u4f8b:203.142.206.81\uff09\u3092\u5909\u63db\u3057\u3066\u3001\u53cc\u65b9\u3092\u3064\u306a\u3050\u5f79\u5272<\/span>\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3067\u5229\u7528\u8005\u304cWeb\u30b5\u30a4\u30c8\u306e\u5834\u6240\u3092\u899a\u3048\u3084\u3059\u304f\u306a\u308a\u3001\u51fa\u6765\u308b\u9650\u308a\u697d\u306a\u64cd\u4f5c\u3067\u76ee\u7684\u5730\u306b\u5230\u9054\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u5909\u63db\u6a5f\u80fd\u306b\u3055\u3089\u306b\u300c\u30ad\u30e3\u30c3\u30b7\u30e5\u300d\u306e\u4ed5\u7d44\u307f\u3092\u5099\u3048\u305f\u306e\u304c\u3001DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30fc\u30d0\u30fc\u3068\u547c\u3070\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30ab\u30b4\u30e4\u306e\u30b5\u30fc\u30d0\u30fc\u7814\u7a76\u5ba4\u3067\u306f\u3001DNS\u306b\u3064\u3044\u3066\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3067\u3088\u308a\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\t\t<div class=\"kh-blog-card\">\n\t\t\t\t\t\t\t<figure class=\"kh-blog-card__thumbnail\">\n\t\t\t\t\t<img decoding=\"async\" width=\"690\" height=\"422\" src=\"https:\/\/www.kagoya.jp\/howto\/wp-content\/uploads\/kagoya1610-3_2_2-1.jpg\" class=\"kh-blog-card__image wp-post-image\" alt=\"\u3010\u56f3\u89e3\u3011DNS\u30b5\u30fc\u30d0\u30fc\u3068\u306f\uff1f\u8a2d\u5b9a\u30fb\u5909\u66f4\u3068\u78ba\u8a8d\u65b9\u6cd5\" \/>\t\t\t\t<\/figure>\n\t\t\t\t\t\t<div class=\"kh-blog-card__text\">\n\t\t\t\t<p class=\"kh-blog-card__title\"><a href=\"https:\/\/www.kagoya.jp\/howto\/it-glossary\/domain\/dns-server\/\">\u3010\u56f3\u89e3\u3011DNS\u30b5\u30fc\u30d0\u30fc\u3068\u306f\uff1f\u8a2d\u5b9a\u30fb\u5909\u66f4\u3068\u78ba\u8a8d\u65b9\u6cd5<\/a><\/p>\n\t\t\t\t<p class=\"kh-blog-card__description\">DNS (Domain Name System) \u306f\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3092\u652f\u3048\u308b\u5927\u5207\u306a\u6280\u8853\u3067\u3059\u3002\u3053\u308c\u304c\u306a\u3044\u3068\u3001Web\u30b5\u30a4\u30c8\u3084\u30e1\u30fc\u30eb\u306e\u5229\u7528\u304c\u3067\u304d\u307e\u305b\u3093\u3002 \u305d\u3082\u305d\u3082\u3001\u3075\u3060\u3093\u4f7f\u3063\u3066\u3044\u308b\u82f1\u6570\u5b57\u306e\u30c9\u30e1\u30a4\u30f3\u540d\u3068\u3001Web\u3084\u30e1\u30fc\u30eb\u306e\u30b5\u30fc\u30d0\u30fc\u6a5f\u5668\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u756a\u53f7 (IP\u30a2\u30c9\u30ec\u30b9) \u3068\u306f\u5225\u7269\u3067\u3059\u3002\u305d\u308c\u3089\u3092\u5909\u63db\u3059\u308b\u60c5\u5831\u3092DNS\u306f\u4fdd\u7ba1\u3057\u3066\u3001\u63d0\u4f9b\u3059\u308b\u30b5\u30fc\u30d3\u30b9\u3092\u62c5\u5f53\u3057\u3066\u3044\u307e\u3059\u3002 \u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u30c9\u30e1\u30a4\u30f3\u540d\u3068IP\u30a2\u30c9\u30ec\u30b9\u3092\u7d50\u3073\u3064\u3051&hellip;<\/p>\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t\n\n\t\t<div class=\"kh-blog-card\">\n\t\t\t\t\t\t\t<figure class=\"kh-blog-card__thumbnail\">\n\t\t\t\t\t<img decoding=\"async\" width=\"600\" height=\"400\" src=\"https:\/\/www.kagoya.jp\/howto\/wp-content\/uploads\/kagoya201910-2.jpg\" class=\"kh-blog-card__image wp-post-image\" alt=\"FQDN\u3068\u306f\uff1f\u30c9\u30e1\u30a4\u30f3\u540d\u30fb\u30db\u30b9\u30c8\u540d\u30fbIP\u30a2\u30c9\u30ec\u30b9\u3068\u306e\u9055\u3044\" \/>\t\t\t\t<\/figure>\n\t\t\t\t\t\t<div class=\"kh-blog-card__text\">\n\t\t\t\t<p class=\"kh-blog-card__title\"><a href=\"https:\/\/www.kagoya.jp\/howto\/it-glossary\/domain\/fqdn\/\">FQDN\u3068\u306f\uff1f\u30c9\u30e1\u30a4\u30f3\u540d\u30fb\u30db\u30b9\u30c8\u540d\u30fbIP\u30a2\u30c9\u30ec\u30b9\u3068\u306e\u9055\u3044<\/a><\/p>\n\t\t\t\t<p class=\"kh-blog-card__description\">FQDN\u3068\u306f\u3001\u4e00\u822c\u7684\u306b\u306f\u30c9\u30e1\u30a4\u30f3\u540d\u3068\u30db\u30b9\u30c8\u540d\u3092\u3064\u306a\u3052\u305f\u6587\u5b57\u5217\u3067\u3059\u3002\u5b9f\u969b\u306b\u306f\u4f55\u3092\u610f\u5473\u3059\u308b\u306e\u3067\u3057\u3087\u3046\u304b\u3002\u30c9\u30e1\u30a4\u30f3\u540d\u3084\u30db\u30b9\u30c8\u540d\u3001IP\u30a2\u30c9\u30ec\u30b9\u3068\u6df7\u540c\u3057\u3066\u4f7f\u308f\u308c\u308b\u3053\u3068\u3082\u3042\u308a\u3001\u5206\u304b\u308a\u306b\u304f\u3044\u3067\u3059\u306d\u3002 \u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001FQDN\u3068\u30c9\u30e1\u30a4\u30f3\u540d\u30fb\u30db\u30b9\u30c8\u540d\u30fbIP\u30a2\u30c9\u30ec\u30b9\u3068\u306e\u9055\u3044\u3092\u660e\u3089\u304b\u306b\u3057\u3066\u3001\u78ba\u8a8d\u65b9\u6cd5\u3084\u5fdc\u7528\u4e8b\u4f8b\u3092\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002 FQDN\u3068\u306f\uff1f FQDN\u3068\u306f\u3001Fully Qualified Domain Name\u306e\u7565\u3067\u3001&hellip;<\/p>\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t\n\n\n<h3 class=\"wp-block-heading\">\u30ad\u30e3\u30c3\u30b7\u30e5\uff08cache\uff09\u3068\u306f\uff1f<\/h3>\n\n\n\n<p>\u3082\u3068\u3082\u3068\u306e\u610f\u5473\u306f\u8caf\u8535\u7269\u3084\u96a0\u3057\u5834\u6240\u3067\u3059\u3002\u30b5\u30fc\u30d0\u30fc\u306a\u3069\u306b\u95a2\u9023\u3059\u308b\u7528\u8a9e\u3067\u306f\u3001<span class=\"kh-marker-blue\">\u30c7\u30fc\u30bf\u3092\u4e00\u6642\u7684\u306b\u4fdd\u5b58\u3059\u308b\u4ed5\u7d44\u307f<\/span>\u306e\u610f\u5473\u306b\u4f7f\u308f\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u6d3b\u7528\u3059\u308c\u3070\u3001Web\u30b5\u30a4\u30c8\u306e\u30c7\u30fc\u30bf\u304c\u3042\u308b\u30b5\u30fc\u30d0\u30fc\u307e\u3067\u3001\u5229\u7528\u8005\u306f\u6bce\u56de\u63a5\u7d9a\u3059\u308b\u5fc5\u8981\u306f\u306a\u304f\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u7d50\u679c\u3001\u5229\u7528\u8005\u306f\u76ee\u7684\u306eWeb\u30b5\u30a4\u30c8\u3092\u3088\u308a\u901f\u304f\u30d6\u30e9\u30a6\u30b6\u306b\u8868\u793a\u3067\u304d\u3001\u30b5\u30fc\u30d0\u30fc\u306e\u65b9\u3082\u6bce\u56de\u5bfe\u5fdc\u304c\u4e0d\u8981\u306b\u306a\u308a\u8ca0\u62c5\u3092\u6e1b\u3089\u3059\u52b9\u679c\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306b\u304a\u91d1\uff08\u30ad\u30e3\u30c3\u30b7\u30e5 &#8211; cash\uff09\u306e\u3088\u3046\u306a\u4fa1\u5024\u3092\u751f\u307f\u51fa\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u540c\u6642\u306b\u601d\u308f\u306c\u5f31\u70b9\u3092\u7a81\u304b\u308c\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4f55\u304c\u300c\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u300d\u3055\u308c\u3066\u3057\u307e\u3046\u306e\u304b\uff1f<\/h3>\n\n\n\n<p>\u305a\u3070\u308a\u30ad\u30e3\u30c3\u30b7\u30e5\u3067\u3059\u3002\u3053\u308c\u3067\u30c9\u30e1\u30a4\u30f3\u3068IP\u30a2\u30c9\u30ec\u30b9\u306e\u5909\u63db\u304c\u6b63\u5e38\u306b\u3067\u304d\u306a\u304f\u306a\u308a\u307e\u3059\u3002\u305d\u3046\u306a\u308b\u3068\u30d6\u30e9\u30a6\u30b6\u306b\u30c9\u30e1\u30a4\u30f3\u540d\u3092\u5165\u529b\u3057\u3066\u8868\u793a\u3055\u308c\u308bWeb\u30b5\u30a4\u30c8\u304c\u3001\u672c\u7269\u306b\u306a\u308a\u3059\u307e\u3057\u305f\u507d\u7269\u306b\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3082\u3057\u3053\u306e\u5618\u306eWeb\u30b5\u30a4\u30c8\u306b\u3042\u308b\u554f\u3044\u5408\u308f\u305b\u30d5\u30a9\u30fc\u30e0\u306b\u3001\u500b\u4eba\u60c5\u5831\u3092\u5165\u529b\u3057\u9001\u4fe1\u3059\u308c\u3070\u3001\u30c7\u30fc\u30bf\u306f\u60aa\u610f\u3092\u3082\u3063\u305f\u4eba\u306b\u9001\u4fe1\u3055\u308c\u307e\u3059\u3002\u305d\u306e\u7d50\u679c\u3001\u60aa\u7528\u3055\u308c\u3066\u91d1\u92ad\u7684\u306a\u88ab\u5bb3\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>DNS\u30b5\u30fc\u30d0\u30fc\u306e<span class=\"kh-marker-blue\">\u672c\u6765\u306e\u5f79\u5272\u306f\u3001\u3042\u304f\u307e\u3067\u6307\u793a\u306b\u5f93\u3063\u305f\u5fe0\u5b9f\u306a\u5909\u63db\u4f5c\u696d<\/span>\u3067\u3059\u3002\u901a\u5e38\u3067\u306f\u3001\u305d\u306e\u6307\u793a\u5185\u5bb9\u306e\u826f\u3057\u60aa\u3057\u307e\u3067\u306f\u5224\u65ad\u306f\u3057\u3066\u3044\u307e\u305b\u3093\u3002\u305d\u306e\u305f\u3081\u4f55\u3089\u304b\u306e\u50cd\u304d\u304b\u3051\u304c\u3042\u308c\u3070\u3001IP\u30a2\u30c9\u30ec\u30b9\u3092\u5225\u306e\u3082\u306e\u306b\u5909\u63db\u3059\u308b\u3053\u3068\u3067\u3001\u672c\u6765\u306e\u30b5\u30fc\u30d0\u30fc\u3067\u306f\u306a\u3044\u7570\u306a\u308b\u30b5\u30fc\u30d0\u30fc\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u3002\u7d50\u679c\u3068\u3057\u3066\u3001\u5618\u306e\u30b5\u30fc\u30d0\u30fc\u4e0a\u306b\u3042\u308bWeb\u30b5\u30a4\u30c8\u304c\u8868\u793a\u3055\u308c\u308b\u3053\u3068\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u304c\u521d\u3081\u3066\u767a\u751f\u3057\u305f2008\u5e74\u4ee5\u964d\u3001\u305d\u306e\u5bfe\u7b56\u306f\u6570\u591a\u304f\u5b9f\u65bd\u3055\u308c\u3066\u304d\u307e\u3057\u305f\u3002\u305d\u306e\u5f8c2020\u5e74\u306b\u306a\u308aSAD DNS\uff08\u30b5\u30c9\u30c7\u30a3\u30fc\u30a8\u30cc\u30a8\u30b9\uff09\u3068\u3044\u3046\u624b\u6cd5\u304c\u767a\u898b\u3055\u308c\u3001\u518d\u3073DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u304c\u6ce8\u76ee\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002SAD DNS\u306b\u3064\u3044\u3066\u306f\u6b21\u7ae0\u3067\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306e\u88ab\u5bb3<\/h2>\n\n\n\n<p>Web\u30b5\u30a4\u30c8\u3067\u30b5\u30fc\u30d3\u30b9\u3092\u5229\u7528\u3059\u308b\u5074\u3068\u63d0\u4f9b\u3059\u308b\u5074\u306b\u5206\u3051\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30b5\u30fc\u30d3\u30b9\u306e\u5229\u7528\u8005\u3068\u3057\u3066\u60f3\u5b9a\u3055\u308c\u308b\u4e3b\u306a\u88ab\u5bb3<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u91d1\u92ad\u7684\u306a\u640d\u5bb3\uff08\u30af\u30ec\u30b8\u30c3\u30c8\u30ab\u30fc\u30c9\u60c5\u5831\u306e\u60aa\u7528\u306a\u3069\u306b\u3088\u308b\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u8a50\u6b3a\uff09<\/li>\n\n\n\n<li>\u507d\u306e\u554f\u3044\u5408\u308f\u305b\u30d5\u30a9\u30fc\u30e0\u306b\u5165\u529b\u3057\u305f\u91cd\u8981\u306a\u60c5\u5831\u304c\u76d7\u307f\u898b\u3089\u308c\u60aa\u7528\u3055\u308c\u308b<\/li>\n\n\n\n<li>\u30de\u30eb\u30a6\u30a7\u30a2\u306b\u611f\u67d3\u3059\u308b\u3053\u3068\u3067PC\u306a\u3069\u304c\u4f7f\u3048\u306a\u304f\u306a\u308b<\/li>\n<\/ul>\n\n\n\n<p>\u30de\u30eb\u30a6\u30a7\u30a2\u306b\u3064\u3044\u3066\u3001\u30ab\u30b4\u30e4\u306e\u30b5\u30fc\u30d0\u30fc\u7814\u7a76\u5ba4\u3067\u306f\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3067\u3088\u308a\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\t\t<div class=\"kh-blog-card\">\n\t\t\t\t\t\t\t<figure class=\"kh-blog-card__thumbnail\">\n\t\t\t\t\t<img decoding=\"async\" width=\"1200\" height=\"630\" src=\"https:\/\/www.kagoya.jp\/howto\/wp-content\/uploads\/servermalware_catch.png\" class=\"kh-blog-card__image wp-post-image\" alt=\"\u3010\u5165\u9580\u3011\u30de\u30eb\u30a6\u30a7\u30a2\u3068\u306f\uff1f\u7a2e\u985e\u3084\u611f\u67d3\u7d4c\u8def\u3001\u75c7\u72b6\u3001\u5bfe\u7b56\u3092\u5206\u304b\u308a\u3084\u3059\u304f\" \/>\t\t\t\t<\/figure>\n\t\t\t\t\t\t<div class=\"kh-blog-card__text\">\n\t\t\t\t<p class=\"kh-blog-card__title\"><a href=\"https:\/\/www.kagoya.jp\/howto\/engineer\/infosecurity\/server-malware\/\">\u3010\u5165\u9580\u3011\u30de\u30eb\u30a6\u30a7\u30a2\u3068\u306f\uff1f\u7a2e\u985e\u3084\u611f\u67d3\u7d4c\u8def\u3001\u75c7\u72b6\u3001\u5bfe\u7b56\u3092\u5206\u304b\u308a\u3084\u3059\u304f<\/a><\/p>\n\t\t\t\t<p class=\"kh-blog-card__description\">\u30de\u30eb\u30a6\u30a7\u30a2\u306f\u300c\u60aa\u610f\u3042\u308b\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u3084\u60aa\u8cea\u306a\u30b3\u30fc\u30c9\u300d\u306e\u7dcf\u79f0\u3067\u3001\u30a6\u30a4\u30eb\u30b9\u3084\u30ef\u30fc\u30e0\u3082\u30de\u30eb\u30a6\u30a7\u30a2\u306e\u4e00\u7a2e\u3067\u3059\u3002 \u611f\u67d3\u3059\u308b\u3068\u30c7\u30fc\u30bf\u7834\u58ca\u3084\u500b\u4eba\u60c5\u5831\u306e\u76d7\u96e3\u3001\u91d1\u92ad\u88ab\u5bb3\u306a\u3069\u306e\u6050\u308c\u304c\u3042\u308a\u307e\u3059\u3002 \u3053\u3053\u3067\u306f\u3001\u30de\u30eb\u30a6\u30a7\u30a2\u306e\u7a2e\u985e\u3084\u611f\u67d3\u7d4c\u8def\u3001\u611f\u67d3\u6642\u306e\u75c7\u72b6\u3001\u4e88\u9632\u5bfe\u7b56\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002 \u30de\u30eb\u30a6\u30a7\u30a2\u3068\u306f \u30de\u30eb\u30a6\u30a7\u30a2\uff08Malware\uff09\u3068\u306f\u3001\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u3067\u4e0d\u6b63\u306b\u52d5\u4f5c\u3057\u3001\u30e6\u30fc\u30b6\u30fc\u306a\u3069\u306b\u88ab\u5bb3\u3092\u3082\u305f\u3089\u3059\u300c\u60aa\u610f\u306e\u3042\u308b\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u3084\u60aa\u8cea&hellip;<\/p>\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t\n\n\n<h3 class=\"wp-block-heading\">\u30b5\u30fc\u30d3\u30b9\u306e\u63d0\u4f9b\u8005\u3068\u3057\u3066\u60f3\u5b9a\u3055\u308c\u308b\u4e3b\u306a\u88ab\u5bb3<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6b63\u5f0f\u306aWeb\u30b5\u30a4\u30c8\u306b\u30a2\u30af\u30bb\u30b9\u3055\u308c\u306a\u3044\u305f\u3081\u3001\u672c\u6765\u306e\u30b5\u30fc\u30d3\u30b9\u304c\u63d0\u4f9b\u3067\u304d\u306a\u304f\u306a\u308b<\/li>\n\n\n\n<li>\u30b5\u30fc\u30d3\u30b9\u306e\u5229\u7528\u6642\u306e\u88ab\u5bb3\u72b6\u6cc1\u304b\u3089\u6839\u62e0\u306e\u306a\u3044\u98a8\u8a55\u88ab\u5bb3\u3092\u53d7\u3051\u3001\u4e8b\u696d\u306b\u640d\u5931\u304c\u51fa\u308b<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306e\u653b\u6483\u624b\u6cd5\u3068\u305d\u306e\u5909\u5316<\/h2>\n\n\n\n<p>\u524d\u7ae0\u3067\u8aac\u660e\u3057\u305f\u57fa\u672c\u7684\u306a\u653b\u6483\u624b\u6cd5\u306b\u52a0\u3048\u3066\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7279\u5fb4\u306e\u3042\u308b\u624b\u6cd5\u306b\u3064\u3044\u3066\u7c21\u5358\u306b\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30ab\u30df\u30f3\u30b9\u30ad\u30fc\u578b\u653b\u6483\uff082008\u5e74\uff09<\/h3>\n\n\n\n<p>\u653b\u6483\u5bfe\u8c61\u306b\u5b58\u5728\u3057\u3066\u3044\u306a\u3044\u30c9\u30e1\u30a4\u30f3\u540d\u3092\u554f\u3044\u5408\u308f\u305b\u3001\u507d\u306eDNS\u300c\u4ed8\u52a0\u60c5\u5831\u300d\u306b\u52a0\u3048\u308b\u305f\u3081\u3001DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30fc\u30d0\u30fc\u306f\u5618\u306e\u60c5\u5831\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">DNS\u6c34\u8cac\u3081\u653b\u6483\uff082014\u5e74\uff09<\/h3>\n\n\n\n<p>\u30e9\u30f3\u30c0\u30e0\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u653b\u6483\u3068\u3082\u547c\u3070\u308c\u3001<span class=\"kh-marker-blue\">\u653b\u6483\u5bfe\u8c61\u306b\u9069\u5f53\u306a\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3092\u5927\u91cf\u306b\u554f\u3044\u5408\u308f\u305b\u3001DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30fc\u30d0\u30fc\u306e\u6a5f\u80fd\u3092\u505c\u6b62\u3055\u305b\u308b\u624b\u6cd5<\/span>\u3067\u3059\u3002\u30b5\u30fc\u30d0\u30fc\u306b\u8a2d\u5b9a\u3057\u3066\u3044\u308b\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u30c7\u30fc\u30bf\u30b5\u30a4\u30ba\u306b\u306f\u9650\u754c\u304c\u3042\u308a\u3001\u305d\u306e\u5236\u7d04\u3092\u60aa\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">SAD DNS\uff082020\u5e74\uff09<\/h3>\n\n\n\n<p><span class=\"kh-marker-blue\">DNS\u30b5\u30fc\u30d0\u30fc\u306e\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u8a2d\u5b9a\u3067\u3001\u305c\u3044\u5f31\u6027\u3092\u7a81\u3044\u305f\u653b\u6483<\/span>\u3067\u3059\u3002\u3053\u306e\u5834\u5408\u3001\u300cICMP\u300d\u3068\u547c\u3070\u308c\u308b\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u5831\u544a\u3059\u308b\u4ed5\u7d44\u307f\u3092\u5229\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3067DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u304c\u3088\u308a\u6210\u529f\u3057\u3084\u3059\u304f\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3010\u53c2\u8003\u30b5\u30a4\u30c8\u3011<br>DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306e\u65b0\u305f\u306a\u624b\u6cd5\u300cSAD DNS\u300d\u3001\u7814\u7a76\u8005\u304c\u767a\u898b<br><a href=\"https:\/\/japan.zdnet.com\/article\/35162418\/\">https:\/\/japan.zdnet.com\/article\/35162418\/<\/a><br>SAD DNS\uff08\u30b5\u30c9\u30c7\u30a3\u30fc\u30a8\u30cc\u30a8\u30b9\uff09<br><a href=\"https:\/\/jprs.jp\/glossary\/index.php?ID=0270\">https:\/\/jprs.jp\/glossary\/index.php?ID=0270<\/a><br>\u5897\u3048\u308bgTLD\u306e\u767b\u9332\u6570\u3001NXNSAttack\u3084SAD DNS\u653b\u6483\u306a\u30692020\u5e74\u306e\u300c\u30c9\u30e1\u30a4\u30f3\u540d\u30cb\u30e5\u30fc\u30b9\u300d<a href=\"https:\/\/ascii.jp\/elem\/000\/004\/038\/4038892\/\">https:\/\/ascii.jp\/elem\/000\/004\/038\/4038892\/<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306e\u57fa\u672c\u7684\u306a\u8003\u3048\u65b9\u3068\u5bfe\u7b56\u4e8b\u4f8b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u57fa\u672c\u7684\u306a\u8003\u3048\u65b9<\/h3>\n\n\n\n<p>\u65e5\u672c\u30ec\u30b8\u30b9\u30c8\u30ea\u30b5\u30fc\u30d3\u30b9(JPRS)\u306e\u8cc7\u6599\uff082014\u5e74\uff09\u306b\u3088\u308c\u3070\u3001\u5bfe\u7b56\u306b\u3064\u3044\u3066\u4ee5\u4e0b\u306e\u4e09\u3064\u306e\u8003\u3048\u65b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u507d\u306e\u5fdc\u7b54\u3092\u6ce8\u5165\u3055\u308c\u306a\u3044\uff08\u3055\u308c\u306b\u304f\u304f\u306a\u308b\uff09\u3088\u3046\u306b\u3059\u308b<\/li>\n\n\n\n<li>\u53d7\u3051\u53d6\u3063\u305f\u5fdc\u7b54\u306e\u30c1\u30a7\u30c3\u30af\u3092\u53b3\u91cd\u306b\u3059\u308b<\/li>\n\n\n\n<li>\u653b\u6483\u3092\u691c\u77e5\u3057\u3066\u5bfe\u5fdc\u3059\u308b<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u308c\u3089\u306f\u4ed6\u306e\u653b\u6483\u306b\u3082\u5341\u5206\u306b\u5fdc\u7528\u304c\u5229\u304d\u3001\u6d41\u884c\u306b\u5de6\u53f3\u3055\u308c\u306a\u3044\u53d6\u308a\u7d44\u307f\u65b9\u3068\u7b46\u8005\u306f\u8003\u3048\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3010\u51fa\u5178\u3011<br>\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u653b\u6483\u5bfe\u7b56\uff1a\u30ad\u30e3\u30c3\u30b7\u30e5DNS\u30b5\u30fc\u30d0\u30fc\u904b\u7528\u8005\u5411\u3051\u2015\u57fa\u672c\u5bfe\u7b56\u7de8\uff0811\u30da\u30fc\u30b8\uff09<a href=\"https:\/\/jprs.jp\/tech\/security\/2014-04-30-poisoning-countermeasure-resolver-1.pdf\">https:\/\/jprs.jp\/tech\/security\/2014-04-30-poisoning-countermeasure-resolver-1.pdf<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30bd\u30fc\u30b9\u30dd\u30fc\u30c8\u30e9\u30f3\u30c0\u30de\u30a4\u30bc\u30fc\u30b7\u30e7\u30f3\uff08Source Port Randomization\uff09\u306e\u5c0e\u5165<\/h3>\n\n\n\n<p><span class=\"kh-marker-blue\">\u554f\u3044\u5408\u308f\u305b\u306e\u30dd\u30fc\u30c8\u756a\u53f7\u3092\u56fa\u5b9a\u305b\u305a\u306b\u3001\u5e83\u3044\u7bc4\u56f2\u306e\u756a\u53f7\u304b\u3089\u7121\u4f5c\u70ba\u306b\u9078\u3073\u3001\u3055\u3089\u306b\u5225\u306e\u8981\u7d20\uff08ID\uff09\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u507d\u88c5\u3092\u96e3\u3057\u304f\u3059\u308b\u65b9\u6cd5<\/span>\u3067\u3059\u3002\u30ab\u30df\u30f3\u30b9\u30ad\u30fc\u578b\u653b\u6483\u306b\u6709\u52b9\u3068\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u5bfe\u7b56\u306e\u5bfe\u8c61\u306f\u8907\u6570\u3042\u308b\u305f\u3081\u3001\u7279\u5b9a\u306e\u5834\u6240\u3060\u3051\u3092\u300c\u30e9\u30f3\u30c0\u30e0\u300d\u306b\u3059\u308c\u3070\u5bfe\u7b56\u7d42\u4e86\u3067\u306f\u306a\u304f\u3001\u6c7a\u3057\u3066\u4e07\u80fd\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p>\u3010\u53c2\u8003\u30b5\u30a4\u30c8\u3011<br>DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\uff082008\u5e74\uff09<br><a href=\"https:\/\/www.nic.ad.jp\/ja\/newsletter\/No40\/0800.html\">https:\/\/www.nic.ad.jp\/ja\/newsletter\/No40\/0800.html<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">DNSSEC (Domain Name System Security Extensions)\u306e\u5c0e\u5165<\/h3>\n\n\n\n<p><span class=\"kh-marker-blue\">\u507d\u88c5\u3055\u308c\u3066\u3044\u306a\u3044\u304b\u30c1\u30a7\u30c3\u30af\u3092\u53b3\u91cd\u306b\u3059\u308b\u305f\u3081\u306b\u3001\u96fb\u5b50\u7f72\u540d\u306e\u4ed5\u7d44\u307f\u3092\u5c0e\u5165<\/span>\u3057\u3066\u3044\u307e\u3059\u3002\u304a\u304a\u307e\u304b\u306a\u4ed5\u7d44\u307f\u306f\u3001\u3075\u3060\u3093\u5229\u7528\u3057\u3066\u3044\u308bSSL\u3068\u540c\u69d8\u3067\u3059\u3002DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30fc\u30d0\u30fc\u306f\u5358\u72ec\u3067\u52d5\u4f5c\u305b\u305a\u3001\u305d\u308c\u3089\u3092\u7ba1\u8f44\u3059\u308b\u300c\u6a29\u5a01DNS\u30b5\u30fc\u30d0\u30fc\u300d\u306b\u554f\u3044\u5408\u308f\u305b\u3092\u3057\u307e\u3059\u3002DNSSEC\u306e\u5c0e\u5165\u306b\u3088\u308a\u672c\u6765\u306e\u6a29\u5a01DNS\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u306e\u5fdc\u7b54\u304b\u3069\u3046\u304b\u3001\u507d\u88c5\u3055\u308c\u3066\u3044\u306a\u3044\u304b\u3092\u70b9\u691c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3010\u53c2\u8003\u30b5\u30a4\u30c8\u3011<br>DNSSEC\u3068\u306f\uff082008\u5e74\uff09<br><a href=\"https:\/\/www.nic.ad.jp\/ja\/basics\/terms\/dnssec.html\">https:\/\/www.nic.ad.jp\/ja\/basics\/terms\/dnssec.html<\/a><br>DNSSEC\uff082009\u5e74\uff09<br><a href=\"https:\/\/www.nic.ad.jp\/ja\/newsletter\/No43\/0800.html\">https:\/\/www.nic.ad.jp\/ja\/newsletter\/No43\/0800.html<\/a><br>\u6a29\u5a01\u30b5\u30fc\u30d0\u30fc\uff08\u6a29\u5a01DNS\u30b5\u30fc\u30d0\u30fc\uff09<br><a href=\"https:\/\/jprs.jp\/glossary\/index.php?ID=0145\">https:\/\/jprs.jp\/glossary\/index.php?ID=0145<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u6709\u52b9\u671f\u9650\u306e\u8a2d\u5b9a\u5024\u3092\u898b\u76f4\u3059<\/h3>\n\n\n\n<p>\u3053\u306e\u5834\u5408<span class=\"kh-marker-blue\">TTL\uff08Time To Live\uff09\u3068\u3044\u3046\u6570\u5024\u3067\u8a2d\u5b9a<\/span>\u3092\u3057\u307e\u3059\u3002\u4f8b\u3048\u30701\u6642\u9593\u6709\u52b9\u306e\u5834\u5408\u306f\u30013600\uff08\u79d2\uff09\u306e\u6570\u5024\u3067\u3059\u3002\u3053\u306e\u8a2d\u5b9a\u3057\u305f\u6642\u9593\u5185\u306f\u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u6709\u52b9\u306a\u305f\u3081\u3001\u305f\u3068\u3048\u5916\u90e8\u304b\u3089\u66f8\u304d\u63db\u3048\u3059\u308b\u3088\u3046\u6307\u793a\u304c\u3042\u3063\u3066\u3082\u66f8\u304d\u63db\u3048\u306f\u5931\u6557\u3057\u307e\u3059\u3002TTL\u304c\u9577\u3051\u308c\u3070\u9577\u3044\u307b\u3069\u6b63\u3057\u3044\u72b6\u614b\u304c\u7d9a\u304f\u305f\u3081\u3001\u4e00\u822c\u7684\u306b\u306fDNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306b\u306f\u6709\u52b9\u3068\u3055\u308c\u3066\u304d\u307e\u3057\u305f\u3002\u305d\u308c\u3067\u3082\u3001\u30ab\u30df\u30f3\u30b9\u30ad\u30fc\u578b\u653b\u6483\u3067\u306f\u507d\u306e\u60c5\u5831\u3067\u4e0a\u66f8\u304d\u3055\u308c\u308b\u65b9\u6cd5\u304c\u898b\u3064\u304b\u308a\u3001DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u5bfe\u7b56\u304c\u7121\u52b9\u3068\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3010\u53c2\u8003\u30b5\u30a4\u30c8\u3011<br>DNS\u30ad\u30e3\u30c3\u30b7\u30e5<br><a href=\"https:\/\/www.nic.ad.jp\/ja\/newsletter\/No51\/NL51_0800.pdf\">https:\/\/www.nic.ad.jp\/ja\/newsletter\/No51\/NL51_0800.pdf<\/a><br>\u65b0\u305f\u306a\u308b\uff24\uff2e\uff33\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306e\u8105\u5a01 \uff5e\u30ab\u30df\u30f3\u30b9\u30ad\u30fc\u30fb\u30a2\u30bf\u30c3\u30af\u306e\u51fa\u73fe\uff5e\uff082011\u5e74\uff09<br><a href=\"https:\/\/jprs.jp\/related-info\/guide\/009.pdf\">https:\/\/jprs.jp\/related-info\/guide\/009.pdf<\/a><\/p>\n\n\n\n<p>\u8a2d\u5b9a\u5024\u3092\u898b\u76f4\u3059\u4f5c\u696d\u306f\u5c02\u9580\u7684\u3067\u96e3\u3057\u3044\u305f\u3081\u3001\u30b5\u30fc\u30d0\u30fc\u306e\u7ba1\u7406\u8005\u304c\u884c\u3046\u3053\u3068\u304c\u307b\u3068\u3093\u3069\u3067\u3059\u3002\u4e00\u822c\u306e\u5229\u7528\u8005\u304c\u8a2d\u5b9a\u72b6\u6cc1\u3092\u78ba\u8a8d\u3067\u304d\u308bWeb\u30b5\u30a4\u30c8\u306f\u3042\u308a\u307e\u3059\u304c\u3001\u3053\u3061\u3089\u3082\u96e3\u89e3\u3067\u3059\u3002<span class=\"kh-marker-blue\">\u4e0d\u660e\u70b9\u306f\u30b5\u30fc\u30d0\u30fc\u3092\u7ba1\u7406\u3057\u3066\u3044\u308b\u696d\u8005\u306a\u3069\u306b\u554f\u3044\u5408\u308f\u305b\u3001\u7591\u554f\u3092\u89e3\u6d88\u3057\u5bfe\u7b56<\/span>\u3092\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">SSL\u306e\u5c0e\u5165<\/h3>\n\n\n\n<p>\u7406\u5c48\u3067\u306f\u3001Web\u30b5\u30a4\u30c8\u306eSSL\u8a3c\u660e\u66f8\u304c\u6b63\u898f\u3067\u3042\u308b\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u308c\u3070\u3001\uff24\uff2e\uff33\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306b\u306f\u5fc3\u914d\u3057\u306a\u304f\u3066\u3082\u3044\u3044\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u308c\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u3001\u300c\u6b63\u898f\u300d\u306aSSL\u8a3c\u660e\u66f8\u3092\u300c\u4e0d\u6b63\u300d\u306b\u53d6\u5f97\u3055\u308c\u3066\u3057\u307e\u3046\u3068\u3001\u3053\u306e\u65b9\u6cd5\u3067\u306f\u5bfe\u51e6\u304c\u56f0\u96e3\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001\u7121\u6599\u3067\u5229\u7528\u3067\u304d\u308b\u300cLet\u2019s Encrypt\u300d\u306e\u3088\u3046\u306a\u30c9\u30e1\u30a4\u30f3\u691c\u8a3c (DV) \u578b\u306e\u8a3c\u660e\u66f8\u306b\u76f8\u5f53\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3010\u53c2\u8003\u30b5\u30a4\u30c8\u3011<br>DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\uff082014\uff09<br><a href=\"https:\/\/eset-info.canon-its.jp\/malware_info\/term\/detail\/00073.html\">https:\/\/eset-info.canon-its.jp\/malware_info\/term\/detail\/00073.html<\/a><br>DNS\u306e\u5b8c\u5168\u6027\u3092\u5b88\u308b\u305f\u3081\u306b\u3059\u3079\u304d\u3053\u3068\uff1aIIJ DNS\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u30b5\u30fc\u30d3\u30b9\u306e\u30b9\u30b4\u3044\u3068\u3053\u308d(\u7b2c3\u56de)\uff082020\uff09<br><a href=\"https:\/\/eng-blog.iij.ad.jp\/archives\/5735\">https:\/\/eng-blog.iij.ad.jp\/archives\/5735<\/a><\/p>\n\n\n\n<p>SSL\u30b5\u30fc\u30d0\u30fc\u8a3c\u660e\u66f8\u306e\u7a2e\u985e\u306b\u3064\u3044\u3066\u3001\u30ab\u30b4\u30e4\u306e\u30b5\u30fc\u30d0\u30fc\u7814\u7a76\u5ba4\u3067\u306f\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\t\t<div class=\"kh-blog-card\">\n\t\t\t\t\t\t\t<figure class=\"kh-blog-card__thumbnail\">\n\t\t\t\t\t<img decoding=\"async\" width=\"1200\" height=\"630\" src=\"https:\/\/www.kagoya.jp\/howto\/wp-content\/uploads\/SSLimg_catch.png\" class=\"kh-blog-card__image wp-post-image\" alt=\"\u3010\u56f3\u89e3\u3011SSL\u3068\u306f\uff1fSSL\/TLS\u306e\u4ed5\u7d44\u307f\u306b\u3064\u3044\u3066\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u307e\u3059\" \/>\t\t\t\t<\/figure>\n\t\t\t\t\t\t<div class=\"kh-blog-card__text\">\n\t\t\t\t<p class=\"kh-blog-card__title\"><a href=\"https:\/\/www.kagoya.jp\/howto\/it-glossary\/security\/ssl\/\">\u3010\u56f3\u89e3\u3011SSL\u3068\u306f\uff1fSSL\/TLS\u306e\u4ed5\u7d44\u307f\u306b\u3064\u3044\u3066\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u307e\u3059<\/a><\/p>\n\t\t\t\t<p class=\"kh-blog-card__description\">SSL\u306f\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306b\u304a\u3044\u3066\u79c1\u305f\u3061\u306e\u6700\u3082\u8eab\u8fd1\u306b\u3042\u308b\u6697\u53f7\u5316\u6280\u8853\u3067\u3059\u304c\u3001\u6982\u8981\u3084\u4ed5\u7d44\u307f\u3092\u77e5\u3089\u306a\u3044\u3068\u3044\u3046\u65b9\u306f\u5c11\u306a\u304f\u306a\u3044\u3067\u3057\u3087\u3046\u3002SSL\u306f\u30c7\u30fc\u30bf\u306e\u6697\u53f7\u5316\u3060\u3051\u304c\u5f79\u5272\u3067\u306a\u304f\u3001Web\u30b5\u30a4\u30c8\u306e\u306a\u308a\u3059\u307e\u3057\u3084\u30c7\u30fc\u30bf\u306e\u6539\u3056\u3093\u3082\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 SSL\u3092\u6d3b\u7528\u3057\u305f\u308a\u5c0e\u5165\u3057\u305f\u308a\u3059\u308b\u305f\u3081\u306b\u306f\u3001SSL\u306b\u95a2\u3059\u308b\u57fa\u672c\u7684\u306a\u77e5\u8b58\u304c\u5fc5\u8981\u3067\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001SSL\u3068\u306f\u4f55\u304b\u3084SSL\u306b\u671f\u5f85\u3055\u308c\u308b\u5f79\u5272\u3001SSL\u5c0e\u5165\u306e\u30e1\u30ea\u30c3\u30c8\u30fb\u30c7\u30e1\u30ea\u30c3\u30c8\u3068\u3044\u3063\u305f&hellip;<\/p>\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t\n\n\n<h2 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