{"id":132500,"date":"2026-01-14T11:33:39","date_gmt":"2026-01-14T02:33:39","guid":{"rendered":"https:\/\/softantenna.com\/blog\/?p=132500"},"modified":"2026-01-14T11:33:39","modified_gmt":"2026-01-14T02:33:39","slug":"windows-25h2-heavy-twice","status":"publish","type":"post","link":"https:\/\/softantenna.com\/blog\/windows-25h2-heavy-twice\/","title":{"rendered":"Windows 11 25H2\u304c\u300c2\u500d\u91cd\u304f\u300d\u306a\u308b\uff1f\u539f\u56e0\u306fCLFS\u306eHMAC\u5316"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/softantenna.com\/blog\/wp-content\/uploads\/2025\/04\/Win1125H2.jpg\" alt=\"\" width=\"1024\" height=\"640\" class=\"aligncenter size-full wp-image-128679\" \/><\/p>\n<p>Microsoft\u306f\u3001\u6bce\u6708\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u66f4\u65b0\u3092\u901a\u3058\u3066\u3001Windows\u306e\u8106\u5f31\u6027\u5bfe\u7b56\u3084\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5f37\u5316\u3092\u7d99\u7d9a\u7684\u306b\u884c\u3063\u3066\u3044\u307e\u3059<\/p>\n<p>\u6628\u5e742025\u5e7411\u6708\u306e\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3067\u306f\u3001Windows 11 25H2 \/ Server 2025\u5411\u3051\u306e\u5909\u66f4\u3068\u3057\u3066\u3001CLFS(Common Log File System)\u5f62\u5f0f\u306e\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb\u306b HMAC(Hash-based Message Authentication Code)\u304c\u5c0e\u5165\u3055\u308c\u3001\u30ed\u30b0\u6539\u3056\u3093\u3078\u306e\u8010\u6027\u304c\u5927\u5e45\u306b\u5f37\u5316\u3055\u308c\u3066\u3044\u305f\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>CLFS\u306fWindows\u5185\u90e8\u3067\u4f7f\u308f\u308c\u308b\u9ad8\u901f\u30ed\u30b0\u30b7\u30b9\u30c6\u30e0\u3067\u3001\u904e\u53bb\u306b\u8106\u5f31\u6027\u304c\u60aa\u7528\u3055\u308c\u305f\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002HMAC\u306e\u4ed8\u4e0e\u306f\u6539\u3056\u3093\u691c\u77e5\u3092\u884c\u3046\u305f\u3081\u306e\u3082\u306e\u3067\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u4ed5\u7d44\u307f\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u30ed\u30b0\u30c7\u30fc\u30bf\uff0b\u79d8\u5bc6\u9375 \u2192 HMAC \u3092\u751f\u6210<\/li>\n<li>\u30ed\u30b0\u3092\u958b\u304f\u969b\u306b HMAC \u3092\u691c\u8a3c<\/li>\n<li>\u6539\u3056\u3093\u3055\u308c\u3066\u3044\u308c\u3070\u30ed\u30b0\u3092\u62d2\u5426<\/li>\n<\/ul>\n<p>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5f37\u5316\u3068\u3057\u3066\u306f\u975e\u5e38\u306b\u91cd\u8981\u306a\u5909\u66f4\u3067\u3059\u3002<\/p>\n<h2>90 \u65e5\u9593\u306e\u300c\u5b66\u7fd2\u30e2\u30fc\u30c9\u300d\u3067\u79fb\u884c\u3092\u30b5\u30dd\u30fc\u30c8<\/h2>\n<p>\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u76f4\u5f8c\u306b\u3059\u3079\u3066\u306e\u30ed\u30b0\u304c\u62d2\u5426\u3055\u308c\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002Microsoft\u306f<strong>90\u65e5\u9593\u306e\u79fb\u884c\u671f\u9593<\/strong>\u3092\u8a2d\u3051\u3066\u3044\u307e\u3059\u3002<\/p>\n<ul>\n<li>\n<p><span>\u65e2\u5b58\u30ed\u30b0\u3092\u958b\u304f\u3068\u81ea\u52d5\u3067 HMAC \u3092\u4ed8\u4e0e<\/span><\/p>\n<\/li>\n<li>\n<p><span>90 \u65e5\u5f8c\u306b\u300c\u5f37\u5236\u30e2\u30fc\u30c9\u300d\u3078\u79fb\u884c<\/span><\/p>\n<\/li>\n<li>\n<p><span>\u672a\u30a2\u30af\u30bb\u30b9\u306e\u30ed\u30b0\u306f <code>fsutil clfs authenticate<\/code> \u3067\u624b\u52d5\u5909\u63db\u304c\u5fc5\u8981<\/span><\/p>\n<\/li>\n<\/ul>\n<p>IT\u7ba1\u7406\u8005\u306f\u3001\u3053\u306e\u671f\u9593\u4e2d\u306b\u30ed\u30b0\u904b\u7528\u3092\u898b\u76f4\u3059\u3053\u3068\u304c\u91cd\u8981\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>\u30ed\u30b0\u51e6\u7406\u306e\u8ca0\u8377\u306f\u5897\u52a0<\/h2>\n<p>\u4eca\u56de\u306e\u5909\u66f4\u306b\u3088\u308a\u30ed\u30b0\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306f\u5f37\u5316\u3055\u308c\u308b\u53cd\u9762\u3001\u30ed\u30b0\u30b5\u30a4\u30ba\u304c\u5897\u52a0\u3057\u3001\u66f8\u304d\u8fbc\u307f\u304c\u6700\u59272\u500d\u9045\u304f\u306a\u308b\u3068\u3044\u3046\u30c7\u30e1\u30ea\u30c3\u30c8\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb\u306e\u30b5\u30a4\u30ba\u306f\u6b21\u306e\u3088\u3046\u306b\u5897\u52a0\u3057\u307e\u3059:<\/p>\n<table>\n<thead>\n<tr>\n<th><span>\u30b3\u30f3\u30c6\u30ca\u30b5\u30a4\u30ba<\/span><\/th>\n<th><span>\u8ffd\u52a0\u30c7\u30fc\u30bf\u91cf<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><span>512KB<\/span><\/td>\n<td>\n<span>\u7d04 <\/span><span>8KB<\/span>\n<\/td>\n<\/tr>\n<tr>\n<td><span>1MB<\/span><\/td>\n<td>\n<span>\u7d04 <\/span><span>12KB<\/span>\n<\/td>\n<\/tr>\n<tr>\n<td><span>10MB<\/span><\/td>\n<td>\n<span>\u7d04 <\/span><span>90KB<\/span>\n<\/td>\n<\/tr>\n<tr>\n<td><span>100MB<\/span><\/td>\n<td>\n<span>\u7d04 <\/span><span>57KB<\/span>\n<\/td>\n<\/tr>\n<tr>\n<td><span>4GB<\/span><\/td>\n<td>\n<span>\u7d04 <\/span><span>2MB<\/span>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u3055\u3089\u306bHMAC\u306e\u751f\u6210\u30fb\u691c\u8a3c\u306b\u3088\u308a I\/O\u51e6\u7406\u306e\u8ca0\u8377\u304c\u5897\u3048\u3001\u30ed\u30b0\u66f8\u304d\u8fbc\u307f\u901f\u5ea6\u304c\u5e73\u5747\u3067\u7d042\u500d\u9045\u304f\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>CLFS\u3078\u306eHMAC\u306e\u4ed8\u4e0e\u306b\u3088\u308a\u30ed\u30b0\u306e\u6539\u3056\u3093\u9632\u6b62\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u304c\u3001\u30ed\u30b0\u306e\u30b5\u30a4\u30ba\u5897\u52a0\u3084\u66f8\u304d\u8fbc\u307f\u901f\u5ea6\u304c\u6700\u59272\u500d\u9045\u304f\u306a\u308b\u3068\u3044\u3046\u5f0a\u5bb3\u304c\u3042\u308a\u307e\u3059\u3002\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5f37\u5316\u306e\u305f\u3081\u306e\u300c\u5fc5\u8981\u306a\u30b3\u30b9\u30c8\u300d\u3067\u306f\u3042\u308b\u3082\u306e\u306e\u3001\u30ed\u30b0\u3092\u591a\u7528\u3059\u308b\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3078\u306e\u5f71\u97ff\u3092\u628a\u63e1\u3057\u3066\u304a\u304f\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u8a73\u7d30\u306f<a href=\"https:\/\/support.microsoft.com\/en-us\/topic\/common-log-file-system-clfs-authentication-mitigation-af903a7e-ceca-410e-a5bf-58b1c79e861d#bkmk_glossary\">\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/a>\u3067\u78ba\u8a8d\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p>[via <a href=\"https:\/\/www.neowin.net\/news\/microsoft-explains-why-windows-11-25h2-got-twice-as-heavy-due-to-a-key-security-update\/\">Neowin<\/a>]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Microsoft\u306f\u3001\u6bce\u6708\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u66f4\u65b0\u3092\u901a\u3058\u3066\u3001Windows\u306e\u8106\u5f31\u6027\u5bfe\u7b56\u3084\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5f37\u5316\u3092\u7d99\u7d9a\u7684\u306b\u884c\u3063\u3066\u3044\u307e\u3059 \u6628\u5e742025\u5e7411\u6708\u306e\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3067\u306f\u3001Windows 11 25H2 \/ Server 2025 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":128679,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":"","footnotes":""},"categories":[3],"tags":[3298,4387],"class_list":["post-132500","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-windows","tag-windows","tag-windows11"],"_links":{"self":[{"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/posts\/132500","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/comments?post=132500"}],"version-history":[{"count":0,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/posts\/132500\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/media\/128679"}],"wp:attachment":[{"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/media?parent=132500"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/categories?post=132500"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/tags?post=132500"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}