{"id":114427,"date":"2023-09-05T19:04:00","date_gmt":"2023-09-05T10:04:00","guid":{"rendered":"https:\/\/www.kotora.jp/c\/?p=114427"},"modified":"2025-09-05T19:07:30","modified_gmt":"2025-09-05T10:07:30","slug":"114427-2","status":"publish","type":"post","link":"https:\/\/www.kotora.jp/c\/114427-2\/","title":{"rendered":"\u300cCBC\u30e2\u30fc\u30c9\u300d\u3092\u5fb9\u5e95\u89e3\u5256\uff01\u305d\u306e\u4ed5\u7d44\u307f\u3068\u6f5c\u3080\u30ea\u30b9\u30af\u3068\u306f\uff1f"},"content":{"rendered":"<div class=\"smb-contents-outline wp-block-snow-monkey-blocks-contents-outline\">\n\t\n<div\n\tclass=\"wpco-wrapper \"\n\taria-hidden=\"true\"\n\tid=\"\"\n\tdata-wpco-post-class=\".post-114427\"\n\tdata-wpco-selector=\".c-entry__content,.c-entry__content .wp-block-group,.c-entry__content .wp-block-group__inner-container\"\n\tdata-wpco-headings=\"h2,h3,h4\"\n\tdata-wpco-move=\"true\"\n\tdata-wpco-move-to=\".c-entry__content\"\n\t>\n\t\n\t<div class=\"wpco\">\n\t\t\t\t\t<h2 class=\"wpco__title\">\u76ee\u6b21<\/h2>\n\t\t\n\t\t<div class=\"contents-outline\"><\/div>\n\t<\/div>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">CBC\u30e2\u30fc\u30c9\u3068\u306f\u4f55\u304b\uff1f<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">CBC\u30e2\u30fc\u30c9\u306e\u57fa\u672c\u6982\u5ff5<\/h3>\n\n\n\n<p>CBC\u30e2\u30fc\u30c9\uff08Cipher Block Chaining\u30e2\u30fc\u30c9\uff09\u306f\u3001\u30c7\u30fc\u30bf\u3092\u5b89\u5168\u306b\u6697\u53f7\u5316\u3059\u308b\u305f\u3081\u306e\u624b\u6cd5\u3067\u3001\u5171\u901a\u9375\u6697\u53f7\u7528\u306e\u6697\u53f7\u30e2\u30fc\u30c9\u306e\u4e00\u3064\u3067\u3059\u3002\u3053\u306e\u30e2\u30fc\u30c9\u3067\u306f\u3001\u30c7\u30fc\u30bf\u3092\u4e00\u5b9a\u306e\u56fa\u5b9a\u30b5\u30a4\u30ba\u306e\u30d6\u30ed\u30c3\u30af\u306b\u5206\u5272\u3057\u3001\u5404\u30d6\u30ed\u30c3\u30af\u3092\u6697\u53f7\u5316\u3059\u308b\u969b\u306b\u3001\u524d\u306e\u30d6\u30ed\u30c3\u30af\u306e\u6697\u53f7\u7d50\u679c\u3092\u73fe\u5728\u306e\u30d6\u30ed\u30c3\u30af\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u6697\u53f7\u5316\u3092\u884c\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u540c\u3058\u30c7\u30fc\u30bf\u304c\u7e70\u308a\u8fd4\u3055\u308c\u308b\u5834\u5408\u3067\u3082\u51fa\u529b\u7d50\u679c\u304c\u7570\u306a\u308a\u3001\u30c7\u30fc\u30bf\u30d1\u30bf\u30fc\u30f3\u3092\u96a0\u3059\u52b9\u679c\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d6\u30ed\u30c3\u30af\u6697\u53f7\u30e2\u30fc\u30c9\u306e\u4e00\u90e8\u3068\u3057\u3066\u306e\u4f4d\u7f6e\u3065\u3051<\/h3>\n\n\n\n<p>CBC\u30e2\u30fc\u30c9\u306f\u3001\u30d6\u30ed\u30c3\u30af\u6697\u53f7\u30e2\u30fc\u30c9\u306e\u4e00\u90e8\u3068\u3057\u3066\u8a2d\u8a08\u3055\u308c\u3066\u304a\u308a\u3001\u305d\u306e\u76ee\u7684\u306f\u6697\u53f7\u5316\u3068\u5fa9\u53f7\u306e\u30d7\u30ed\u30bb\u30b9\u306b\u304a\u3044\u3066\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u5f37\u5316\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u4ed6\u306e\u30d6\u30ed\u30c3\u30af\u6697\u53f7\u30e2\u30fc\u30c9\u3068\u540c\u69d8\u306b\u3001AES\uff08Advanced Encryption Standard\uff09\u30843DES\uff08Triple Data Encryption Standard\uff09\u306a\u3069\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3067\u4f7f\u7528\u3055\u308c\u307e\u3059\u304c\u3001\u521d\u671f\u5316\u30d9\u30af\u30c8\u30eb\uff08IV\uff09\u306e\u5229\u7528\u306b\u3088\u3063\u3066\u4e00\u610f\u306a\u6697\u53f7\u5316\u7d50\u679c\u3092\u751f\u6210\u3057\u307e\u3059\u3002\u3053\u306eIV\u306f\u3001\u6700\u521d\u306e\u30d6\u30ed\u30c3\u30af\u306e\u6697\u53f7\u5316\u3067\u306e\u307f\u4f7f\u7528\u3055\u308c\u3001\u305d\u308c\u4ee5\u964d\u306f\u524d\u306e\u30d6\u30ed\u30c3\u30af\u306e\u6697\u53f7\u7d50\u679c\u304c\u6b21\u306e\u30d6\u30ed\u30c3\u30af\u3078\u3068\u5f15\u304d\u7d99\u304c\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4ed6\u306e\u6697\u53f7\u30e2\u30fc\u30c9\u3068\u306e\u6bd4\u8f03<\/h3>\n\n\n\n<p>CBC\u30e2\u30fc\u30c9\u306f\u4ed6\u306e\u6697\u53f7\u30e2\u30fc\u30c9\u3001\u4f8b\u3048\u3070CFB\uff08Cipher Feedback\uff09\u3084CTR\uff08Counter\uff09\u30e2\u30fc\u30c9\u3068\u6bd4\u8f03\u3057\u305f\u969b\u306b\u3001\u3044\u304f\u3064\u304b\u306e\u7279\u5fb4\u7684\u306a\u70b9\u304c\u3042\u308a\u307e\u3059\u3002\u4e00\u3064\u306e\u5927\u304d\u306a\u9055\u3044\u306f\u3001CBC\u30e2\u30fc\u30c9\u304c\u6697\u53f7\u5316\u304a\u3088\u3073\u5fa9\u53f7\u30d7\u30ed\u30bb\u30b9\u3067\u4e26\u5217\u51e6\u7406\u304c\u96e3\u3057\u3044\u70b9\u3067\u3059\u3002\u3053\u306e\u7279\u6027\u306f\u3001\u6697\u53f7\u30d7\u30ed\u30bb\u30b9\u306b\u304a\u3051\u308b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u5236\u9650\u3092\u5f15\u304d\u8d77\u3053\u3059\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u4e00\u65b9\u3067\u3001\u30c7\u30fc\u30bf\u30d1\u30bf\u30fc\u30f3\u306e\u96a0\u8b77\u53d6\u308a\u7d44\u307f\u306b\u512a\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u591a\u304f\u306e\u30b7\u30b9\u30c6\u30e0\u3084\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u63a1\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u9069\u5207\u306a\u8a2d\u8a08\u3084\u6539\u3056\u3093\u30c1\u30a7\u30c3\u30af\u6a5f\u80fd\u304c\u6b20\u5982\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u8106\u5f31\u6027\u304c\u751f\u3058\u308b\u30ea\u30b9\u30af\u3082\u3042\u308a\u307e\u3059\u3002\u7279\u306b\u3001\u30d1\u30c7\u30a3\u30f3\u30b0\u30aa\u30e9\u30af\u30eb\u653b\u6483\u306e\u3088\u3046\u306a\u624b\u6cd5\u304c\u305d\u306e\u30ea\u30b9\u30af\u306e\u4ee3\u8868\u4f8b\u3067\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/www.kotora.jp\/c\/114125-2\n<\/div><\/figure>\n\n\n\n<p class=\"has-text-align-right\"><strong><a href=\"https:\/\/www.kotora.jp\/service\/tenshoku_entry.php?utm_campaign=kotora_contents_114427\">\u8ee2\u8077\u306e\u3054\u76f8\u8ac7\uff08\u7121\u6599\uff09\u306f\u3053\u3061\u3089\uff1e<\/a><\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">CBC\u30e2\u30fc\u30c9\u306e\u4ed5\u7d44\u307f\u3068\u305d\u306e\u6d41\u308c<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">CBC\u30e2\u30fc\u30c9\u306e\u6697\u53f7\u5316\u30d7\u30ed\u30bb\u30b9<\/h3>\n\n\n\n<p>CBC\u30e2\u30fc\u30c9\uff08Cipher Block Chaining\u30e2\u30fc\u30c9\uff09\u306f\u3001\u6697\u53f7\u5316\u3092\u884c\u3046\u969b\u306b\u5e73\u6587\u3092\u56fa\u5b9a\u30b5\u30a4\u30ba\u306e\u30d6\u30ed\u30c3\u30af\u306b\u5206\u5272\u3057\u3001\u5404\u30d6\u30ed\u30c3\u30af\u3092\u4e00\u5b9a\u306e\u624b\u9806\u3067\u6697\u53f7\u5316\u3059\u308b\u4ed5\u7d44\u307f\u3092\u63a1\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u6700\u521d\u306b\u3001\u5e73\u6587\u30d6\u30ed\u30c3\u30af\u3068\u521d\u671f\u5316\u30d9\u30af\u30c8\u30eb\uff08IV\uff09\u304c\u6392\u4ed6\u7684\u8ad6\u7406\u548c\uff08XOR\uff09\u3055\u308c\u3001\u6697\u53f7\u5316\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306b\u6e21\u3055\u308c\u307e\u3059\u3002\u6b21\u306b\u3001\u3053\u306e\u6697\u53f7\u5316\u7d50\u679c\u304c\u6b21\u306e\u5e73\u6587\u30d6\u30ed\u30c3\u30af\u3068\u518d\u3073XOR\u3055\u308c\u3066\u6697\u53f7\u5316\u304c\u9032\u307f\u307e\u3059\u3002\u3053\u306e\u9023\u9396\u7684\u306a\u51e6\u7406\u306b\u3088\u308a\u3001\u5404\u30d6\u30ed\u30c3\u30af\u306e\u6697\u53f7\u5316\u7d50\u679c\u304c\u524d\u306e\u30d6\u30ed\u30c3\u30af\u306b\u4f9d\u5b58\u3059\u308b\u305f\u3081\u3001\u30c7\u30fc\u30bf\u30d1\u30bf\u30fc\u30f3\u304c\u5de7\u5999\u306b\u96a0\u853d\u3055\u308c\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u3053\u306e\u4ed5\u7d44\u307f\u306f\u8a08\u7b97\u3092\u9806\u6b21\u884c\u3046\u305f\u3081\u3001\u4e26\u5217\u51e6\u7406\u304c\u56f0\u96e3\u3067\u3042\u308b\u3068\u3044\u3046\u5236\u7d04\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">IV\uff08\u521d\u671f\u5316\u30d9\u30af\u30c8\u30eb\uff09\u306e\u5f79\u5272\u3068\u91cd\u8981\u6027<\/h3>\n\n\n\n<p>\u521d\u671f\u5316\u30d9\u30af\u30c8\u30eb\uff08IV\uff09\u306f\u3001CBC\u30e2\u30fc\u30c9\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306b\u304a\u3044\u3066\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002IV\u306f\u3001\u6697\u53f7\u5316\u30d7\u30ed\u30bb\u30b9\u306e\u6700\u521d\u306e\u30d6\u30ed\u30c3\u30af\u306b\u9069\u7528\u3055\u308c\u308b\u5024\u3067\u3001\u540c\u3058\u5e73\u6587\u304c\u6697\u53f7\u5316\u3055\u308c\u3066\u3082\u51fa\u529b\u7d50\u679c\u304c\u7570\u306a\u308b\u3088\u3046\u306b\u50cd\u304d\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u6697\u53f7\u5316\u3055\u308c\u305f\u30c7\u30fc\u30bf\u304b\u3089\u5e73\u6587\u306e\u985e\u4f3c\u6027\u3092\u7279\u5b9a\u3059\u308b\u3053\u3068\u304c\u96e3\u3057\u304f\u306a\u308a\u307e\u3059\u3002\u3057\u304b\u3057\u3001IV\u304c\u4e88\u6e2c\u53ef\u80fd\u3067\u3042\u3063\u305f\u308a\u518d\u5229\u7528\u3055\u308c\u305f\u308a\u3057\u305f\u5834\u5408\u3001cbc\u30e2\u30fc\u30c9\u306e\u8106\u5f31\u6027\u3092\u5f15\u304d\u8d77\u3053\u3057\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30ea\u30b9\u30af\u304c\u5897\u5927\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u5341\u5206\u5b89\u5168\u306a\u4e71\u6570\u751f\u6210\u5668\u3092\u7528\u3044\u3066IV\u3092\u751f\u6210\u3059\u308b\u3053\u3068\u304c\u63a8\u5968\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5fa9\u53f7\u5316\u30d7\u30ed\u30bb\u30b9\u306b\u3064\u3044\u3066<\/h3>\n\n\n\n<p>\u5fa9\u53f7\u5316\u30d7\u30ed\u30bb\u30b9\u306f\u6697\u53f7\u5316\u30d7\u30ed\u30bb\u30b9\u3068\u306f\u9006\u306e\u6d41\u308c\u3067\u884c\u308f\u308c\u307e\u3059\u3002\u5177\u4f53\u7684\u306b\u306f\u3001\u6697\u53f7\u5316\u30c7\u30fc\u30bf\u30d6\u30ed\u30c3\u30af\u3092\u5fa9\u53f7\u5316\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306b\u901a\u3057\u3066\u5f97\u3089\u308c\u305f\u7d50\u679c\u3068\u3001\u524d\u306e\u6697\u53f7\u30d6\u30ed\u30c3\u30af\u307e\u305f\u306f\u521d\u671f\u5316\u30d9\u30af\u30c8\u30eb\uff08IV\uff09\u3092XOR\u3059\u308b\u3053\u3068\u3067\u5143\u306e\u5e73\u6587\u30d6\u30ed\u30c3\u30af\u3092\u518d\u69cb\u6210\u3057\u307e\u3059\u3002\u3053\u306e\u51e6\u7406\u306b\u3088\u3063\u3066\u3001CBC\u30e2\u30fc\u30c9\u3067\u306f\u5fa9\u53f7\u5316\u304c\u53ef\u80fd\u3068\u306a\u308a\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u5fa9\u53f7\u5316\u306e\u969b\u306b\u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027\u691c\u8a3c\u304c\u306a\u3044\u5834\u5408\u3001Padding Oracle Attack\u306a\u3069\u306e\u653b\u6483\u624b\u6cd5\u306b\u3088\u308a\u3001\u653b\u6483\u8005\u304c\u6697\u53f7\u5316\u3055\u308c\u305f\u30c7\u30fc\u30bf\u3092\u60aa\u7528\u3059\u308b\u30ea\u30b9\u30af\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u6539\u3056\u3093\u30c1\u30a7\u30c3\u30af\u6a5f\u80fd\u3084\u6574\u5408\u6027\u78ba\u8a8d\u3092\u4f75\u7528\u3059\u308b\u3053\u3068\u304c\u5fc5\u8981\u3068\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/www.kotora.jp\/c\/113811-2\n<\/div><\/figure>\n\n\n\n<p class=\"has-text-align-right\"><strong><a href=\"https:\/\/www.kotora.jp\/service\/tenshoku_entry.php?utm_campaign=kotora_contents_114427\">\u8ee2\u8077\u306e\u3054\u76f8\u8ac7\uff08\u7121\u6599\uff09\u306f\u3053\u3061\u3089\uff1e<\/a><\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">CBC\u30e2\u30fc\u30c9\u306e\u8106\u5f31\u6027\u3068\u305d\u306e\u30ea\u30b9\u30af<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Padding Oracle Attack\u3068\u306f\uff1f<\/h3>\n\n\n\n<p>Padding Oracle Attack\u3068\u306f\u3001CBC\u30e2\u30fc\u30c9\u306e\u8106\u5f31\u6027\u3092\u5229\u7528\u3057\u305f\u653b\u6483\u624b\u6cd5\u3067\u3001\u653b\u6483\u8005\u304c\u6697\u53f7\u5316\u3055\u308c\u305f\u30c7\u30fc\u30bf\u3092\u5fa9\u53f7\u5316\u3059\u308b\u305f\u3081\u306e\u624b\u304c\u304b\u308a\u3092\u5f97\u308b\u65b9\u6cd5\u3067\u3059\u3002\u3053\u306e\u653b\u6483\u3067\u306f\u3001\u6697\u53f7\u5316\u3055\u308c\u305f\u30c7\u30fc\u30bf\u30d6\u30ed\u30c3\u30af\u306b\u5bfe\u3057\u3066\u7279\u5b9a\u306e\u64cd\u4f5c\u3084\u6539\u3056\u3093\u3092\u52a0\u3048\u3001\u305d\u306e\u7d50\u679c\u3068\u3057\u3066\u5fa9\u53f7\u5316\u30d7\u30ed\u30bb\u30b9\u304c\u300c\u6210\u529f\u300d\u307e\u305f\u306f\u300c\u5931\u6557\u300d\u306e\u901a\u77e5\u3092\u8fd4\u3059\u52d5\u4f5c\u3092\u60aa\u7528\u3057\u307e\u3059\u3002\u300cOracle\uff08\u30aa\u30e9\u30af\u30eb\uff09\u300d\u3068\u306f\u3053\u3046\u3057\u305f\u901a\u77e5\u3092\u6307\u3057\u3001\u305d\u306e\u60c5\u5831\u3092\u57fa\u306b\u653b\u6483\u8005\u306f\u30c7\u30fc\u30bf\u306e\u5185\u5bb9\u3092\u63a8\u6e2c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>CBC\u30e2\u30fc\u30c9\u3067\u306f\u3001\u5404\u30d6\u30ed\u30c3\u30af\u306e\u5fa9\u53f7\u6642\u306b\u30d1\u30c7\u30a3\u30f3\u30b0\u306e\u6709\u52b9\u6027\u304c\u78ba\u8a8d\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u70b9\u3092\u7a81\u304f\u306e\u304cPadding Oracle Attack\u3067\u3059\u3002\u30d1\u30c7\u30a3\u30f3\u30b0\u306f\u3001\u30c7\u30fc\u30bf\u3092\u56fa\u5b9a\u30b5\u30a4\u30ba\u306e\u30d6\u30ed\u30c3\u30af\u306b\u8abf\u6574\u3059\u308b\u305f\u3081\u306b\u4ed8\u52a0\u3055\u308c\u307e\u3059\u304c\u3001\u3053\u308c\u3092\u9069\u5207\u306b\u51e6\u7406\u3057\u306a\u3044\u5b9f\u88c5\u3067\u306f\u3001\u653b\u6483\u8005\u304c\u5fa9\u53f7\u7d50\u679c\u3092\u6bb5\u968e\u7684\u306b\u89e3\u660e\u3059\u308b\u8db3\u304c\u304b\u308a\u3068\u306a\u308b\u305f\u3081\u3001\u5b89\u5168\u6027\u3092\u640d\u306a\u3046\u30ea\u30b9\u30af\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6574\u5408\u6027\u30c1\u30a7\u30c3\u30af\u306b\u304a\u3051\u308b\u554f\u984c\u70b9<\/h3>\n\n\n\n<p>CBC\u30e2\u30fc\u30c9\u306b\u304a\u3051\u308b\u8a2d\u8a08\u4e0a\u306e\u554f\u984c\u3068\u3057\u3066\u3001\u6697\u53f7\u5316\u3055\u308c\u305f\u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027\u3092\u76f4\u63a5\u30c1\u30a7\u30c3\u30af\u3057\u306a\u3044\u5834\u5408\u3001\u305d\u306e\u30c7\u30fc\u30bf\u304c\u6539\u3056\u3093\u3055\u308c\u308b\u5371\u967a\u304c\u3042\u308a\u307e\u3059\u3002\u5177\u4f53\u7684\u306b\u306f\u3001\u8907\u6570\u306e\u30d6\u30ed\u30c3\u30af\u306b\u5206\u3051\u3066\u51e6\u7406\u3059\u308bCBC\u30e2\u30fc\u30c9\u3067\u306f\u3001\u7279\u5b9a\u306e\u30d6\u30ed\u30c3\u30af\u3060\u3051\u304c\u653b\u6483\u8005\u306b\u3088\u3063\u3066\u6539\u3056\u3093\u3055\u308c\u3066\u3082\u3001\u5fa9\u53f7\u30d7\u30ed\u30bb\u30b9\u5168\u4f53\u306b\u5927\u304d\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u307e\u305b\u3093\u3002\u305d\u306e\u7d50\u679c\u3001\u653b\u6483\u8005\u306b\u8a31\u53ef\u3055\u308c\u3066\u3044\u306a\u3044\u30b3\u30fc\u30c9\u306e\u5b9f\u884c\u3084\u30c7\u30fc\u30bf\u6d41\u51fa\u306e\u30ea\u30b9\u30af\u304c\u9ad8\u307e\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>Microsoft\u3092\u306f\u3058\u3081\u3001\u591a\u304f\u306e\u4f01\u696d\u3084\u7814\u7a76\u8005\u304c\u3053\u306e\u8106\u5f31\u6027\u306b\u7740\u76ee\u3057\u3066\u304a\u308a\u3001\u6697\u53f7\u5316\u89e3\u9664\u6642\u306b\u306f\u6574\u5408\u6027\u306e\u78ba\u8a8d\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u304c\u63a8\u5968\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u6539\u3056\u3093\u3084\u653b\u6483\u3092\u672a\u7136\u306b\u9632\u3050\u3053\u3068\u304c\u53ef\u80fd\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4eca\u56de\u306e\u8106\u5f31\u6027\u306b\u95a2\u9023\u3059\u308b\u5b9f\u4f8b<\/h3>\n\n\n\n<p>\u5177\u4f53\u7684\u306a\u5b9f\u4f8b\u3068\u3057\u3066\u30012020\u5e7411\u670825\u65e5\u306bNTT\u3001\u5175\u5eab\u770c\u7acb\u5927\u5b66\u3001NEC\u306e\u7814\u7a76\u8005\u304c\u767a\u8868\u3057\u305f\u7814\u7a76\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u7814\u7a76\u3067\u306f\u3001CBC\u30e2\u30fc\u30c9\u3092\u5229\u7528\u3057\u305f\u6697\u53f7\u5316\u306b\u304a\u3051\u308b\u8106\u5f31\u6027\u304c\u6307\u6458\u3055\u308c\u307e\u3057\u305f\u3002\u5f7c\u3089\u306f\u3001\u6539\u3056\u3093\u30c1\u30a7\u30c3\u30af\u304c\u4e0d\u5341\u5206\u306a\u5834\u5408\u306b\u3001\u653b\u6483\u8005\u304c\u6697\u53f7\u5316\u3055\u308c\u305f\u30d0\u30a4\u30ca\u30ea\u30d5\u30a1\u30a4\u30eb\u306b\u4efb\u610f\u306e\u30b3\u30fc\u30c9\u3092\u57cb\u3081\u8fbc\u3080\u3053\u3068\u304c\u53ef\u80fd\u3067\u3042\u308b\u3053\u3068\u3092\u793a\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u8106\u5f31\u6027\u306e\u5f71\u97ff\u3068\u3057\u3066\u3001\u8a31\u53ef\u3055\u308c\u3066\u3044\u306a\u3044\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u5b9f\u884c\u3084\u3001\u7279\u5b9a\u306e\u30dd\u30fc\u30c8\u3092\u4ecb\u3057\u3066\u306e\u4e0d\u6b63\u306a\u30b3\u30fc\u30c9\u5b9f\u884c\u304c\u6319\u3052\u3089\u308c\u307e\u3059\u3002\u3053\u306e\u653b\u6483\u306f\u3001\u6697\u53f7\u5316\u30c4\u30fc\u30eb\u3084OpenSSL\u306e\u3088\u3046\u306a\u666e\u53ca\u3057\u3066\u3044\u308b\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u306b\u304a\u3044\u3066\u7279\u306b\u554f\u984c\u306b\u306a\u308b\u3068\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u6539\u3056\u3093\u3055\u308c\u305f\u30c7\u30fc\u30bf\u304c\u4f7f\u7528\u3055\u308c\u305f\u5834\u5408\u3001\u30b7\u30b9\u30c6\u30e0\u5168\u4f53\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u304c\u640d\u306a\u308f\u308c\u308b\u305f\u3081\u3001\u91cd\u8981\u306a\u8b66\u9418\u3068\u3057\u3066\u6349\u3048\u3089\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e92\u63db\u6027\u306e\u305f\u3081\u306b\u6f5c\u5728\u7684\u306b\u4f7f\u7528\u3055\u308c\u308b\u5834\u9762<\/h3>\n\n\n\n<p>CBC\u30e2\u30fc\u30c9\u306f\u3001AES\u30843DES\u306a\u3069\u306e\u30d6\u30ed\u30c3\u30af\u6697\u53f7\u3068\u3068\u3082\u306b\u9577\u3044\u9593\u4f7f\u7528\u3055\u308c\u3066\u304d\u305f\u6697\u53f7\u5316\u30e2\u30fc\u30c9\u3067\u3042\u308a\u3001\u305d\u306e\u4e92\u63db\u6027\u306e\u9ad8\u3055\u304b\u3089\u73fe\u5728\u3067\u3082\u4e00\u90e8\u306e\u30b7\u30b9\u30c6\u30e0\u3067\u5229\u7528\u3055\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u7279\u306b\u3001\u53e4\u3044\u30b7\u30b9\u30c6\u30e0\u3084\u30ec\u30ac\u30b7\u30fc\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u74b0\u5883\u3067\u306f\u3001\u6700\u65b0\u306e\u6697\u53f7\u5316\u30e2\u30fc\u30c9\u306b\u79fb\u884c\u3057\u3066\u3044\u306a\u3044\u30b1\u30fc\u30b9\u304c\u898b\u3089\u308c\u308b\u305f\u3081\u3001CBC\u30e2\u30fc\u30c9\u304c\u5f15\u304d\u7d9a\u304d\u4f7f\u7528\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3057\u304b\u3057\u3001\u3053\u3046\u3057\u305f\u5229\u7528\u306f\u6f5c\u5728\u7684\u306a\u30ea\u30b9\u30af\u3092\u4f34\u3044\u307e\u3059\u3002\u6574\u5408\u6027\u30c1\u30a7\u30c3\u30af\u6a5f\u80fd\u306e\u4e0d\u8db3\u3084\u3001IV\uff08\u521d\u671f\u5316\u30d9\u30af\u30c8\u30eb\uff09\u306e\u9069\u5207\u306a\u6271\u3044\u304c\u884c\u308f\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u3001\u8106\u5f31\u6027\u304c\u9855\u5728\u5316\u3059\u308b\u53ef\u80fd\u6027\u304c\u9ad8\u307e\u308a\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u4e92\u63db\u6027\u3092\u76ee\u7684\u306bCBC\u30e2\u30fc\u30c9\u3092\u4f7f\u7528\u3059\u308b\u969b\u306b\u306f\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56\u3092\u5fb9\u5e95\u3057\u3066\u884c\u3046\u3053\u3068\u304c\u4e0d\u53ef\u6b20\u3067\u3059\u3002\u7279\u306b\u3001\u6539\u3056\u3093\u691c\u77e5\u6a5f\u80fd\u3084\u6700\u65b0\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306e\u9069\u7528\u304c\u91cd\u8981\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/www.kotora.jp\/c\/94733-2\n<\/div><\/figure>\n\n\n\n<p class=\"has-text-align-right\"><strong><a href=\"https:\/\/www.kotora.jp\/service\/tenshoku_entry.php?utm_campaign=kotora_contents_114427\">\u8ee2\u8077\u306e\u3054\u76f8\u8ac7\uff08\u7121\u6599\uff09\u306f\u3053\u3061\u3089\uff1e<\/a><\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">CBC\u30e2\u30fc\u30c9\u306e\u5b89\u5168\u306a\u5229\u7528\u65b9\u6cd5\u3068\u9078\u629e\u80a2<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u5b89\u5168\u306a\u6697\u53f7\u30d7\u30ed\u30c8\u30b3\u30eb\u3078\u306e\u79fb\u884c<\/h3>\n\n\n\n<p>CBC\u30e2\u30fc\u30c9\u306f\u6697\u53f7\u5316\u306b\u304a\u3044\u3066\u5e83\u304f\u4f7f\u7528\u3055\u308c\u3066\u304d\u307e\u3057\u305f\u304c\u3001\u8fd1\u5e74\u3001\u305d\u306e\u8106\u5f31\u6027\u304c\u6307\u6458\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u7279\u306b\u30d1\u30c7\u30a3\u30f3\u30b0\u30aa\u30e9\u30af\u30eb\u653b\u6483\u306e\u3088\u3046\u306a\u8105\u5a01\u306b\u5bfe\u51e6\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u3088\u308a\u5b89\u5168\u306a\u6697\u53f7\u30d7\u30ed\u30c8\u30b3\u30eb\u3078\u306e\u79fb\u884c\u304c\u63a8\u5968\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001TLS\uff08Transport Layer Security\uff09\u306e\u6700\u65b0\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u306f\u3001\u6697\u53f7\u5316\u30d7\u30ed\u30bb\u30b9\u306b\u304a\u3044\u3066\u6539\u3056\u3093\u691c\u77e5\u6a5f\u80fd\u304c\u7d44\u307f\u8fbc\u307e\u308c\u3066\u3044\u308b\u305f\u3081\u3001CBC\u30e2\u30fc\u30c9\u306e\u5f31\u70b9\u3092\u514b\u670d\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u5411\u4e0a\u306e\u305f\u3081\u306b\u306f\u3001\u6574\u5408\u6027\u4fdd\u8b77\u3092\u5099\u3048\u305f\u6697\u53f7\u30e2\u30fc\u30c9\u306e\u5229\u7528\u304c\u91cd\u8981\u3067\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u30d7\u30ed\u30c8\u30b3\u30eb\u3078\u306e\u79fb\u884c\u306f\u3001\u9577\u671f\u7684\u306a\u30b7\u30b9\u30c6\u30e0\u306e\u5b89\u5168\u6027\u3092\u78ba\u4fdd\u3059\u308b\u4e0a\u3067\u6b20\u304b\u305b\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">GCM\u3084CTR\u30e2\u30fc\u30c9\u306a\u3069\u306e\u4ee3\u66ff\u30e2\u30fc\u30c9<\/h3>\n\n\n\n<p>CBC\u30e2\u30fc\u30c9\u306e\u4ee3\u308f\u308a\u3068\u3057\u3066\u3001GCM\uff08Galois\/Counter Mode\uff09\u3084CTR\uff08Counter 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property=\"og:image:height\" content=\"518\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"\u30b3\u30c8\u30e9\uff08\u5e83\u5831\u30c1\u30fc\u30e0\uff09\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u30b3\u30c8\u30e9\uff08\u5e83\u5831\u30c1\u30fc\u30e0\uff09\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593\" \/>\n\t<meta name=\"twitter:data2\" content=\"1\u5206\" \/>\n<script type=\"application\/ld+json\" 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