{"id":5735,"date":"2022-12-06T16:41:55","date_gmt":"2022-12-06T07:56:55","guid":{"rendered":"https:\/\/www.inforsec.org\/wp\/?p=5735"},"modified":"2022-12-06T16:41:55","modified_gmt":"2022-12-06T07:56:55","slug":"%e3%80%90%e8%ae%ba%e6%96%87%e5%88%86%e4%ba%ab%e3%80%91%e9%92%88%e5%af%b9%e9%82%ae%e4%bb%b6%e5%ae%89%e5%85%a8%e6%89%a9%e5%b1%95%e5%8d%8f%e8%ae%aedkim%e7%9a%84%e5%a4%a7%e8%a7%84%e6%a8%a1%e6%b5%8b","status":"publish","type":"post","link":"http:\/\/202.112.238.40\/wp\/?p=5735","title":{"rendered":"\u3010\u8bba\u6587\u5206\u4eab\u3011\u9488\u5bf9\u90ae\u4ef6\u5b89\u5168\u6269\u5c55\u534f\u8baeDKIM\u7684\u5927\u89c4\u6a21\u6d4b\u91cf\u4e0e\u5b89\u5168\u6027\u5206\u6790\uff08\u90ae\u4ef6\u7cfb\u7edf\u5b89\u5168\u5b66\u672f\u524d\u6cbf\u7cfb\u5217\uff09"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"> \u4ee5\u4e0b\u6587\u7ae0\u6765\u6e90\u4e8eNISL\u5b9e\u9a8c\u5ba4\u00a0\uff0c\u4f5c\u8005\u738b\u695a\u6db5 <\/p>\n\n\n\n<p 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Security 2022\uff08\u5f55\u53d6\u7387 18.6%\uff09\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"284\" src=\"https:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2022\/12\/image-34-1024x284.png\" alt=\"\" class=\"wp-image-5736\" srcset=\"http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-34-1024x284.png 1024w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-34-300x83.png 300w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-34-768x213.png 768w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-34-150x42.png 150w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-34-250x69.png 250w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-34.png 1342w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><br><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5168\u6587\u51714200\u5b57\uff0c\u9605\u8bfb\u65f6\u95f4\u7ea612\u5206\u949f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>\u4f5c\u8005\u4ecb\u7ecd\uff1a\u738b\u695a\u6db5\uff0c\u6e05\u534e\u5927\u5b66\u7f51\u7edc\u4e0e\u7cfb\u7edf\u5b89\u5168\u5b9e\u9a8c\u5ba4\u535a\u58eb\u7814\u7a76\u751f\uff0c\u7814\u7a76\u65b9\u5411\u4e3a\u7f51\u7edc\u5b89\u5168\u3001\u6570\u636e\u9a71\u52a8\u5b89\u5168\uff0c\u5bfc\u5e08\u4e3a\u6bb5\u6d77\u65b0\u6559\u6388\u4e0e\u9648\u5efa\u519b\u52a9\u7406\u6559\u6388\u3002\u66fe\u5728\u7f51\u7edc\u5b89\u5168\u9876\u7ea7\u5b66\u672f\u4f1a\u8baeUSENIX Security\u4e0a\u53d1\u8868\u591a\u7bc7\u8bba\u6587\u3002\u76ee\u524d\u4e3b\u8981\u4ece\u4e8b\u7535\u5b50\u90ae\u4ef6\u76f8\u5173\u5b89\u5168\u7814\u7a76\uff0c\u7814\u7a76\u6210\u679c\u5e2e\u52a9Google\uff0cApple\uff0cYandex 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class=\"wp-block-paragraph\">\u7535\u5b50\u90ae\u4ef6\u4f2a\u9020\u653b\u51fb\u6a2a\u884c\u7684\u4e00\u4e2a\u91cd\u8981\u539f\u56e0\u662f\u90ae\u4ef6\u534f\u8bae\uff08SMTP\uff09\u7f3a\u5c11\u5fc5\u8981\u8eab\u4efd\u9a8c\u8bc1\u673a\u5236\u3002\u8fd1\u5e74\u6765\uff0c\u7814\u7a76\u4eba\u5458\u9646\u7eed\u63d0\u51fa\u4e86\u591a\u79cd\u7528\u4e8e\u9a8c\u8bc1\u53d1\u4ef6\u4eba\u8eab\u4efd\u7684\u90ae\u4ef6\u5b89\u5168\u6269\u5c55\u534f\u8bae\uff0c\u5176\u4e2d\u6700\u5177\u4ee3\u8868\u6027\u7684\u5305\u62ec\uff1a\u53d1\u4ef6\u4eba\u7b56\u7565\u6846\u67b6\uff08SPF\uff09[1]\uff0c\u57df\u5bc6\u94a5\u6807\u8bc6\u7684\u90ae\u4ef6\uff08DKIM\uff09[2]\u548c\u57fa\u4e8e\u57df\u7684\u6d88\u606f\u8ba4\u8bc1\u3001\u62a5\u544a\u548c\u4e00\u81f4\u6027\uff08DMARC\uff09[3]\uff0c\u5206\u522b\u4ece\u53d1\u4fe1\u65b9 IP 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class=\"wp-block-paragraph\">DKIM\u534f\u8bae\u662f\u4e00\u9879\u57fa\u4e8e\u6570\u5b57\u7b7e\u540d\u7684\u8eab\u4efd\u9a8c\u8bc1\u534f\u8bae\uff0c\u57fa\u4e8e\u54c8\u5e0c\u7b97\u6cd5\u548c\u975e\u5bf9\u79f0\u52a0\u5bc6\u7b97\u6cd5\uff08\u4e3b\u8981\u4e3aRSA\u7b97\u6cd5\uff09\u8ba1\u7b97DKIM\u7b7e\u540d\u3002\u53d1\u4fe1\u65b9\u90ae\u4ef6\u670d\u52a1\u5668\u4f1a\u5c06DKIM\u7b7e\u540d\u6dfb\u52a0\u5230\u6bcf\u5c01\u7535\u5b50\u90ae\u4ef6\u7684\u4fe1\u5934\u4e2d\uff0c\u6765\u786e\u4fdd\u53d1\u51fa\u7684\u7535\u5b50\u90ae\u4ef6\u4e0d\u88ab\u7b2c\u4e09\u65b9\u4fee\u6539\u6216\u8005\u4f2a\u9020\u3002\u63a5\u6536\u65b9\u53ef\u4ee5\u901a\u8fc7\u67e5\u8be2\u53d1\u4fe1\u4eba\u76f8\u5e94\u57df\u540d\u4e0b\u7684DNS\u8bb0\u5f55\u83b7\u5f97DKIM\u516c\u94a5\u5e76\u5bf9\u90ae\u4ef6\u8fdb\u884c\u9a8c\u8bc1\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"235\" src=\"https:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2022\/12\/image-35-1024x235.png\" alt=\"\" class=\"wp-image-5737\" srcset=\"http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-35-1024x235.png 1024w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-35-300x69.png 300w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-35-768x176.png 768w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-35-150x34.png 150w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-35-250x57.png 250w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-35.png 1168w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"text-align:center\">\u56fe\u88681 \u90ae\u4ef6\u5934\u90e8\u4e2d\u7684DKIM\u7b7e\u540d\u793a\u4f8b<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"150\" src=\"https:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2022\/12\/image-36-1024x150.png\" alt=\"\" class=\"wp-image-5738\" srcset=\"http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-36-1024x150.png 1024w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-36-300x44.png 300w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-36-768x113.png 768w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-36-150x22.png 150w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-36-1050x155.png 1050w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-36-250x37.png 250w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-36.png 1058w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"text-align:center\">\u56fe\u88682 \u90e8\u7f72\u5728DNS\u670d\u52a1\u5668\u4e0a\u7684DKIM\u8bb0\u5f55<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>DKIM\u534f\u8bae\u7684\u5de5\u4f5c\u6d41\u7a0b<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u63a5\u4e0b\u6765\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e0bDKIM\u7684\u5de5\u4f5c\u6d41\u7a0b\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1. \u9996\u5148\uff0c\u53d1\u9001\u65b9\u9700\u8981\u90e8\u7f72DKIM\u534f\u8bae\uff0c\u5373\u4f7f\u7528\u975e\u5bf9\u79f0\u52a0\u5bc6\u7b97\u6cd5\u751f\u6210\u4e00\u4e2a\u5bc6\u94a5\u5bf9\uff0c\u5e76\u628aDKIM\u8bb0\u5f55\uff08\u4e3b\u8981\u662fDKIM\u7684\u516c\u94a5\u4fe1\u606f\uff09\u90e8\u7f72\u5728\u4e00\u4e2a\u6307\u5b9a\u57df\u540d\uff08&lt;selector&gt;._domainkey.&lt;example.com&gt;\uff09\u7684DNS\u670d\u52a1\u5668\u4e0a\uff1b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2.\u63a5\u4e0b\u6765\uff0c\u5f53\u53d1\u9001\u65b9\u53d1\u9001\u90ae\u4ef6\u65f6\uff0c\u4f1a\u7ed9\u53d1\u9001\u51fa\u7684\u90ae\u4ef6\u8ba1\u7b97\u4e00\u4e2aDKIM\u7b7e\u540d\uff0c\u8ba1\u7b97\u7684\u5185\u5bb9\u5305\u62ec\u90ae\u4ef6\u5934\u3001\u90ae\u4ef6\u6b63\u6587\u8fd8\u6709DKIM-Signature\u81ea\u8eab\uff1b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">3. \u6700\u540e\uff0c\u5f53\u63a5\u6536\u65b9\u6536\u5230\u4e00\u4efd\u542b\u6709DKIM\u7b7e\u540d\u7684\u90ae\u4ef6\u540e\uff0c\u4f1a\u5148\u8bbf\u95ee\u53d1\u9001\u65b9\u76f8\u5e94\u57df\u540d\u7684DNS\u670d\u52a1\u5668\uff0c\u63d0\u53d6DKIM\u516c\u94a5\u8bb0\u5f55\uff0c\u5e76\u5bf9\u90ae\u4ef6\u6b63\u6587\u8fd8\u6709\u90ae\u4ef6\u5168\u6587\u8ba1\u7b97hash\u503c\uff0c\u5229\u7528\u516c\u94a5\u6765\u9a8c\u8bc1DKIM\u7b7e\u540d\u7684\u6b63\u786e\u6027\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"420\" src=\"https:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2022\/12\/image-37-1024x420.png\" alt=\"\" class=\"wp-image-5739\" srcset=\"http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-37-1024x420.png 1024w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-37-300x123.png 300w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-37-768x315.png 768w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-37-150x61.png 150w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-37-250x102.png 250w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-37.png 1410w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"text-align:center\">\u56fe\u88683 DKIM\u534f\u8bae\u5de5\u4f5c\u6d41\u7a0b\u793a\u610f\u56fe<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>02<\/strong><strong>\u3010\u7814\u7a76\u65b9\u6cd5\u3011<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8bba\u6587\u7ed3\u5408\u88ab\u52a8\u5206\u6790\u548c\u4e3b\u52a8\u626b\u63cf\u7684\u65b9\u6cd5\uff0c\u5bf9DKIM\u7684\u90e8\u7f72\u73b0\u72b6\u8fdb\u884c\u4e86\u9996\u6b21\u5927\u89c4\u6a21\u548c\u957f\u671f\u7684\u6d4b\u91cf\u7814\u7a76\uff0c\u4e3b\u8981\u5206\u4e3a\u4e09\u4e2a\u9636\u6bb5\uff1a\u6570\u636e\u6536\u96c6\u3001\u6570\u636e\u5904\u7406\u548c\u6570\u636e\u5206\u6790\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"403\" src=\"https:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2022\/12\/image-39-1024x403.png\" alt=\"\" class=\"wp-image-5741\" srcset=\"http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-39-1024x403.png 1024w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-39-300x118.png 300w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-39-768x302.png 768w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-39-150x59.png 150w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-39-250x98.png 250w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-39.png 1353w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"text-align:center\">\u56fe\u88684 DKIM\u6570\u636e\u83b7\u53d6\u4e0e\u5206\u6790\u6d41\u7a0b\u56fe<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u9996\u5148\u662f\u6570\u636e\u6536\u96c6\u3002\u672c\u7bc7\u8bba\u6587\u7684\u7814\u7a76\u6570\u636e\u4e3b\u8981\u4ece\u5de5\u4e1a\u754c\u5408\u4f5c\u4f19\u4f34\u5904\u83b7\u5f97\u3002\u83b7\u53d6DKIM\u4fe1\u606f\u4e3b\u8981\u6709\u4e24\u79cd\u9014\u5f84\uff0c\u4e00\u79cd\u662fDKIM Records\u6570\u636e\uff0c\u53e6\u4e00\u79cd\u662fDKIM Signatures\u6570\u636e\u3002DKIM Records\u90e8\u7f72\u5728\u4e00\u4e2a\u6709\u4e00\u5b9a\u968f\u673a\u6027\u7684\u57df\u540d\u4e0a\uff0c\u5f88\u96be\u8fdb\u884c\u5927\u89c4\u6a21\u6d4b\u91cf\u3002DKIM\u7b7e\u540d\u53c8\u53ea\u5b58\u5728\u90ae\u4ef6\u7684\u5934\u90e8\uff0c\u56e0\u4e3a\u7528\u6237\u9690\u79c1\u7b49\u539f\u56e0\u4e5f\u5f88\u96be\u5927\u89c4\u6a21\u83b7\u53d6\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u867d\u7136\u76f4\u63a5\u83b7\u53d6\u76f8\u5173\u7684\u6570\u636e\u6bd4\u8f83\u56f0\u96be\uff0c\u4f46\u7531\u4e8eDKIM Records\u4f1a\u88ab\u90e8\u7f72\u5728DNS\u670d\u52a1\u5668\u4e0a\uff0c\u53ef\u4ee5\u901a\u8fc7Passive DNS\u6570\u636e\u96c6\u6765\u88ab\u52a8\u6536\u96c6\u5230\u76f8\u5173\u7684\u6570\u636e\u3002\u5b8c\u6574\u7684\u90ae\u4ef6\u5934\u90e8\u53ef\u80fd\u5305\u542b\u5f88\u591a\u654f\u611f\u4fe1\u606f\uff0c\u4f46\u662fDKIM\u7b7e\u540d\u81ea\u8eab\u662f\u4e0d\u5305\u542b\u9690\u79c1\u6570\u636e\u7684\u3002\u6b64\u5916\uff0c\u4f5c\u8005\u8fd8\u901a\u8fc7\u548cCoremail\u516c\u53f8\u5408\u4f5c\u7684\u65b9\u5f0f\uff0c\u83b7\u5f97\u4e86\u5927\u91cf\u7684\u90ae\u4ef6\u670d\u52a1\u5668\u65e5\u5fd7\uff0c\u5e76\u7531\u6b64\u83b7\u5f97\u4e86DKIM\u7b7e\u540d\u6570\u636e\u3002\u6700\u7ec8\u5f62\u6210\u4e86\u6db5\u76d6500\u4e07\u4e2a\u57df\u540d\u548c200\u4e07\u4e2aDKIM\u9009\u62e9\u5668\u7684\u6570\u636e\u96c6\uff0c\u65f6\u95f4\u8de8\u5ea6\u8d85\u8fc75\u5e74\uff082015-2020\uff09\uff0c\u5982\u56fe\u88685\u6240\u793a\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"506\" src=\"https:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2022\/12\/image-40-1024x506.png\" alt=\"\" class=\"wp-image-5742\" srcset=\"http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-40-1024x506.png 1024w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-40-300x148.png 300w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-40-768x379.png 768w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-40-150x74.png 150w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-40-250x123.png 250w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-40.png 1395w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"text-align:center\">\u56fe\u88685&nbsp;DKIM\u6570\u636e\u96c6\u603b\u89c8<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u83b7\u53d6\u6570\u636e\u540e\uff0c\u4f5c\u8005\u5bf9\u539f\u59cb\u6570\u636e\u8fdb\u884c\u4e86\u6e05\u6d17\u3001\u805a\u5408\u3001\u53bb\u91cd\u7b49\u4e00\u7cfb\u5217\u64cd\u4f5c\u3002\u8bba\u6587\u53d1\u73b0\uff0c\u5c3d\u7ba1\u7406\u8bba\u4e0a\uff0c\u90e8\u7f72DKIM\u57df\u540d\u4e2d\u7684&lt;selector&gt;\u5b57\u6bb5\u7531\u57df\u540d\u6240\u6709\u8005\u4efb\u610f\u6307\u5b9a\uff0c\u4f46\u5b9e\u9645\u4f7f\u7528\u4e2d\uff0c\u5927\u91cf\u57df\u540d\u5c06\u8be5\u5b57\u6bb5\u8bbe\u7f6e\u4e3amail\u3001default\u3001dkim\u7b49\u5e38\u89c1\u503c\u3002\u56e0\u6b64\uff0c\u4f5c\u8005\u9009\u53d6\u4e86Passive DNS\u4e2d\u5206\u6790\u5f97\u7684Top 40\u7684selector\uff0c\u5bf9Alexa Top 1M\u7684\u57df\u540d\u8fdb\u884c\u4e86\u5927\u89c4\u6a21\u7684\u626b\u63cf\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u540e\uff0c\u8bba\u6587\u5229\u7528\u626b\u63cf\u5f97\u5230\u7684\u7ed3\u679c\u8fdb\u884c\u4e86DKIM\u90e8\u7f72\u7387\u5206\u6790\u3001\u8bed\u6cd5\u5206\u6790\u3001\u5bc6\u94a5\u7ba1\u7406\u5206\u6790\u8fd8\u6709DKIM\u7b7e\u540d\u5b9e\u73b0\u7684\u5b89\u5168\u5206\u6790\u3002<br><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>03 \u3010\u4e3b\u8981\u53d1\u73b0\u3011<\/strong><br><strong>1. DKIM\u90e8\u7f72\u7387\u7b26\u5408\u9884\u671f\uff0c\u4f46\u5728\u4e0d\u540c\u7684\u9876\u7ea7\u57df\u540d\u4e2d\u5dee\u5f02\u5f88\u5927<br><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5229\u7528\u4ece\u6570\u636e\u96c6\u4e2d\u5206\u6790\u5f97\u5230\u7684\u6d41\u884c\u7684DKIM\u9009\u62e9\u5668\uff0c\u8bba\u6587\u67e5\u8be2Alexa\u4e86\u524d100\u4e07\u4e2a\u57df\u540d\u7684DKIM\u8bb0\u5f55\uff0c\u7ed3\u679c\u5982\u56fe\u88686\u6240\u793a\u3002\u7814\u7a76\u53d1\u73b0\uff0c\u81f3\u5c11\u670928.1%\u7684\u57df\u540d\u5df2\u7ecf\u90e8\u7f72\u4e86DKIM\uff0c\u8fd9\u4e00\u6bd4\u4f8b\u5728\u6709MX\u8bb0\u5f55\u7684\u57df\u540d\u4e2d\u662f37%\u3002\u4f46\u662f\uff0cDKIM\u90e8\u7f72\u7387\u5728\u4e0d\u540c\u7684\u9876\u7ea7\u57df\u540d\u4e2d\u5dee\u5f02\u5f88\u5927\uff1a\u5728\u6d4b\u8bd5\u7684\u901a\u7528\u9876\u7ea7\u57df\u540d\uff08gTLDs\uff09\u4e2d\uff0c.edu\u57df\u540d\u90e8\u7f72\u7387\uff0871.3%\uff09\u6700\u9ad8\uff0c\u800c\u5728\u56fd\u5bb6\u4ee3\u7801\u9876\u7ea7\u57df\u540d\uff08ccTLDs\uff09\u4e2d\uff0c\u6700\u9ad8\u7684\u90e8\u7f72\u7387\uff0858.6%\uff09\u6765\u81ea.au\uff08\u6fb3\u5927\u5229\u4e9a\uff09\u57df\u540d\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"308\" src=\"https:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2022\/12\/image-41-1024x308.png\" alt=\"\" class=\"wp-image-5743\" srcset=\"http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-41-1024x308.png 1024w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-41-300x90.png 300w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-41-768x231.png 768w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-41-150x45.png 150w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-41-250x75.png 250w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-41.png 1352w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"text-align:center\">\u56fe\u88686&nbsp;Alexa\u524d\u4e00\u767e\u4e07\u57df\u540d\u4e2dSPF\u3001DKIM\u3001DMARC\u534f\u8bae\u7684\u90e8\u7f72\u60c5\u51b5<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2.&nbsp;\u90e8\u5206\u57df\u540d\u7684DKIM\u914d\u7f6e\u5b58\u5728\u8bed\u6cd5\u9519\u8bef\u95ee\u9898<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u57fa\u4e8e\u524d\u4e00\u9636\u6bb5DKIM\u90e8\u7f72\u7387\u7684\u6d4b\u91cf\u7ed3\u679c\uff0c\u8bba\u6587\u8fdb\u4e00\u6b65\u5bf9DKIM\u7684\u90e8\u7f72\u73b0\u72b6\u8fdb\u884c\u4e86\u5206\u6790\u3002\u5728Alexa\u6392\u540d\u524d100\u4e07\u7684\u57df\u540d\u4e2d\uff0c\u53d1\u73b0\u67098,147\u6761\u90e8\u7f72\u8bb0\u5f55\u7531\u4e8e\u7f3a\u5c11\u6216\u4e0d\u6b63\u786e\u7684DKIM\u8bb0\u5f55\u800c\u65e0\u6cd5\u88ab\u9a8c\u8bc1\u3002\u8fd9\u4e9b\u57df\u540d\u5360\u6240\u6709\u652f\u6301DKIM\u7684\u57df\u540d\u76842.9%\u3002\u66f4\u7cdf\u7cd5\u7684\u662f\uff0c\u67093,292\u4e2a\u57df\u540d\u88ab\u914d\u7f6e\u4e86\u4e0d\u6b63\u5e38\u7684DKIM\u5b57\u6bb5\uff0c\u8fd9\u4f1a\u76f4\u63a5\u5bfc\u81f4DKIM\u516c\u94a5\u89e3\u6790\u9519\u8bef\uff0c\u8fdb\u800c\u5bfc\u81f4\u57df\u540d\u65e0\u6cd5\u88abDKIM\u6709\u6548\u4fdd\u62a4\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>3. \u666e\u904d\u5b58\u5728\u7684DKIM\u5bc6\u94a5\u7ba1\u7406\u5b89\u5168\u95ee\u9898<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8bba\u6587\u53d1\u73b0\uff0cDKIM\u7684\u5bc6\u94a5\u7ba1\u7406\u666e\u904d\u5b58\u5728\u5b89\u5168\u7f3a\u9677\uff0c\u5305\u62ec\u5171\u4eabDKIM\u5bc6\u94a5\uff0866.9%\uff09\u3001\u5f31DKIM\u5bc6\u94a5\uff0884%\uff09\u3001\u957f\u671f\uff08\u8d85\u8fc75\u5e74\uff09\u672a\u8f6e\u6362DKIM\u5bc6\u94a5\uff088.4%\uff09\u7b49\uff0c\u5177\u4f53\u4ecb\u7ecd\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>a)\u00a0\u5927\u91cf\u57df\u540d\u5b58\u5728\u5bc6\u94a5\u751f\u547d\u5468\u671f\u8fc7\u957f\u7684\u95ee\u9898\u3002<\/strong>\u76f8\u5173\u7ec4\u7ec7\u5efa\u8bae\uff0cDKIM\u5bc6\u94a5\u5e94\u8be5\u4e00\u5e74\u8f6e\u63622\u6b21\u6765\u964d\u4f4e\u5b89\u5168\u98ce\u9669\u3002\u4f46\u662f\u5f88\u5c11\u6709\u57df\u540d\u9075\u5b88\u8fd9\u4e00\u5b9e\u8df5\u3002\u4e0b\u56fe\u663e\u793a\u4e86Alexa Top 100\u57df\u540d\u7684DKIM\u5bc6\u94a5\u751f\u547d\u5468\u671f\u7684\u5206\u6790\u7ed3\u679c\uff0c\u9ec4\u8272\u90e8\u5206\u4ee3\u8868\u7740\u81f3\u5c11\u67095\u5e74\u6ca1\u6709\u66f4\u6362\u7684\u5bc6\u94a5\u4e2a\u6570\u3002\u7ed3\u679c\u663e\u793a\uff0c\u6570\u636e\u8986\u76d6\u768454\u4e2a\u57df\u540d\uff08Alexa Top 100\uff09\u4e2d\u670968.5%\u7684\u57df\u540d\u5b58\u5728\u8fc7\u53bb\u4e94\u5e74\u6ca1\u6709\u66f4\u65b0\u8fc7\u7684\u5bc6\u94a5\u3002\u8003\u8651\u5230PassiveDNS\u6570\u636e\u8bb0\u5f55\u5e76\u4e0d\u80fd\u5b8c\u5168\u4ee3\u8868DKIM key\u7684\u5b9e\u9645\u751f\u547d\u5468\u671f\uff0c\u6240\u4ee5\uff0c\u5b9e\u9645\u60c5\u51b5\u5f80\u5f80\u8981\u66f4\u4e3a\u4e25\u91cd\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"414\" src=\"https:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2022\/12\/image-42-1024x414.png\" alt=\"\" class=\"wp-image-5744\" srcset=\"http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-42-1024x414.png 1024w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-42-300x121.png 300w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-42-768x311.png 768w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-42-150x61.png 150w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-42-250x101.png 250w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-42.png 1369w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"text-align:center\">\u56fe\u88687&nbsp;\u77e5\u540d\u57df\u540d\u7684DKIM\u5bc6\u94a5\u751f\u547d\u5468\u671f\u7edf\u8ba1<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>b)\u5f31\u5bc6\u94a5\u7684\u4f7f\u7528\u4f9d\u65e7\u975e\u5e38\u666e\u904d<\/strong>\u3002\u65e9\u57282010\u5e74\u7f8e\u56fdNIST\u5c31\u5df2\u5efa\u8bae\u4e0d\u8981\u4f7f\u7528\u5c0f\u4e8e\u7b49\u4e8e1024\u4f4d\u7684RSA\u5bc6\u94a5\uff0cRFC 8301\u540c\u6837\u660e\u786e\u8981\u6c42\u5efa\u8bae\u4f7f\u7528\u81f3\u5c11\u4e3a2048\u4f4d\u7684DKIM\u5bc6\u94a5\u3002\u4f46\u662f\uff0c\u7814\u7a76\u7ed3\u679c\u663e\u793a\uff0c\u5728Passive DNS\u6570\u636e\u96c6\u4e2d\u4f9d\u7136\u670984%\u7684\u57df\u540d\u4f7f\u7528DKIM\u5f31\u5bc6\u94a5\uff08\u957f\u5ea6\u5c0f\u4e8e2048\uff09\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"863\" height=\"395\" src=\"https:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2022\/12\/image-43.png\" alt=\"\" class=\"wp-image-5745\" srcset=\"http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-43.png 863w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-43-300x137.png 300w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-43-768x352.png 768w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-43-150x69.png 150w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-43-250x114.png 250w\" sizes=\"auto, (max-width: 863px) 100vw, 863px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"text-align:center\">\u56fe\u88688&nbsp;PassiveDNS\u4e2d\u7684DKIM\u5bc6\u94a5\u5f3a\u5ea6\u7edf\u8ba1<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6b64\u5916\uff0c\u8bba\u6587\u8fdb\u4e00\u6b65\u5206\u6790\u4e86\u6bcf\u5e74\u65b0\u589e\u52a0\u7684DKIM\u5bc6\u94a5\u7684\u957f\u5ea6\u3002\u53ef\u4ee5\u770b\u5230\uff0c1024\u6bd4\u7279\u7684DKIM\u5bc6\u94a5\u4ecd\u7136\u662f\u5f53\u524d\u5b9e\u8df5\u4e2d\u7684\u4e3b\u6d41\u3002\u957f\u5ea6\u4e0d\u8d85\u8fc7512\u6bd4\u7279\u7684\u5bc6\u94a5\u7684\u6bd4\u4f8b\u6b63\u5728\u4e0b\u964d\uff0c\u800c2048\u6bd4\u7279\u7684\u5bc6\u94a5\u7684\u6bd4\u4f8b\u6b63\u5728\u9010\u6b65\u4e0a\u5347\u3002\u7ed3\u679c\u8868\u660e\uff0c\u90ae\u4ef6\u7ba1\u7406\u5458\u5728\u66f4\u65b0DKIM\u914d\u7f6e\u65f6\u503e\u5411\u4e8e\u4f7f\u7528\u66f4\u5b89\u5168\u7684\u5bc6\u94a5\uff0c\u4f46\u63a8\u8fdb\u8fc7\u7a0b\u975e\u5e38\u7f13\u6162\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"542\" src=\"https:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2022\/12\/image-45-1024x542.png\" alt=\"\" class=\"wp-image-5747\" srcset=\"http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-45-1024x542.png 1024w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-45-300x159.png 300w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-45-768x406.png 768w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-45-150x79.png 150w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-45-250x132.png 250w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-45.png 1263w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"text-align:center\">\u56fe\u88689&nbsp;\u6bcf\u5e74\u65b0\u589eDKIM\u5bc6\u94a5\u7684\u5bc6\u94a5\u957f\u5ea6\u7edf\u8ba1<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>c)DKIM\u90e8\u7f72\u5e7f\u6cdb\u5b58\u5728\u5171\u4eab\u5bc6\u94a5\u95ee\u9898\u3002<\/strong>\u7814\u7a76\u4ee5DKIM\u5bc6\u94a5\uff08\u516c\u94a5\uff09\u5bf9\u57df\u540d\u8fdb\u884c\u805a\u7c7b\u53d1\u73b0\uff0c\u670961,062\u4e2aDKIM\u5bc6\u94a5\u88ab\u4e00\u4e2a\u4ee5\u4e0a\u7684\u57df\u5171\u4eab\uff0c\u800c\u4f7f\u7528\u5171\u4eabDKIM\u5bc6\u94a5\u7684\u57df\u540d\u591a\u8fbe2,427,682\u4e2a\uff0866.9%\uff09\u3002\u4e0b\u8868\u663e\u793a\u4e86\u5171\u4eabDKIM\u5bc6\u94a5\u7684\u524d10\u4e2a\u57df\u540d\u7c07\u3002\u6392\u540d\u7b2c\u4e00\u7684DKIM\u5bc6\u94a5\u88ab\u8d85\u8fc7289,120\u4e2a\u57df\u540d\u5171\u4eab\uff0c\u8be5\u5bc6\u94a5\u7528\u4e8e\u8c37\u6b4c\u7684\u7535\u5b50\u90ae\u4ef6\u670d\u52a1\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"627\" src=\"https:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2022\/12\/image-46-1024x627.png\" alt=\"\" class=\"wp-image-5748\" srcset=\"http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-46-1024x627.png 1024w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-46-300x184.png 300w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-46-768x470.png 768w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-46-150x92.png 150w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-46-245x150.png 245w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-46.png 1127w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"text-align:center\">\u56fe\u886810 \u4f7f\u7528\u5171\u4eabDKIM\u5bc6\u94a5\u7684\u57df\u540d\u96c6\u5408\u6392\u540d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>4. DKIM\u7684\u7b7e\u540d\u5b9e\u73b0\u5b58\u5728\u591a\u79cd\u5b89\u5168\u9690\u60a3<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9DKIM\u7b7e\u540d\u5b9e\u73b0\u7684\u76f8\u5173\u5206\u6790\u53d1\u73b0\uff0c\u73b0\u5b9e\u4e16\u754c\u4e2d94.2%\u7684\u57df\u540d\u5b58\u5728DKIM\u7b7e\u540d\u95ee\u9898\uff0c\u5305\u62ec\u6ca1\u6709\u4fdd\u62a4\u5173\u952e\u7684\u7535\u5b50\u90ae\u4ef6\u5934\u90e8\u5b57\u6bb5\u3001\u5728DKIM\u7b7e\u540d\u4e2d\u4f7f\u7528\u4e0d\u5b89\u5168\u7684 &#8220;l=&#8221;\u6807\u7b7e\u53ca\u4f7f\u7528\u8fc7\u65f6\u7684\u54c8\u5e0c\u7b97\u6cd5\uff08SHA-1\uff09\u7b49\u3002\u5177\u4f53\u4ecb\u7ecd\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>a) DKIM\u7b7e\u540d\u6ca1\u6709\u4fdd\u62a4\u5173\u952e\u7684\u5934\u5b57\u6bb5<\/strong>\u3002DKIM\u7684RFC6376\u4e2d\u53ea\u660e\u786e\u8981\u6c42\u4e86From\u5b57\u6bb5\u4e00\u5b9a\u8981\u88ab\u7b7e\u540d\uff0c\u4f46\u662f\u4e00\u5c01\u90ae\u4ef6\u5305\u542b\u7684\u5934\u90e8\u5f88\u591a\uff0c\u5982From\u3001to\u3001subject\u3001Content-Type\u7b49\u7b49\u3002\u5df2\u6709\u7814\u7a76\u8868\u660e\uff0c\u82e5\u6b64\u7c7b\u5173\u952e\u5b57\u6bb5\u6ca1\u6709\u88ab\u4fdd\u62a4\uff0cDKIM\u7b7e\u540d\u5f88\u5bb9\u6613\u88ab\u653b\u51fb\u8005\u7528\u6765\u8fdb\u884c\u91cd\u653e\u653b\u51fb\u3002\u4f46\u662f\u534f\u8bae\u5e76\u672a\u660e\u786e\u5b9a\u4e49DKIM\u7b7e\u540d\u9700\u8981\u5bf9\u54ea\u4e9b\u4fe1\u606f\u8fdb\u884c\u4fdd\u62a4\u3002\u56e0\u4e3a\u7f3a\u5c11\u534f\u8bae\u89c4\u8303\uff0c\u73b0\u5b9e\u4e2d\u5bf9\u4e8e\u90ae\u4ef6\u5934\u5b57\u6bb5\u7684\u4fdd\u62a4\u5f80\u5f80\u53c2\u5dee\u4e0d\u9f50\uff0c\u53d6\u51b3\u4e8e\u90ae\u4ef6\u7ba1\u7406\u5458\u5bf9\u4e8e\u90ae\u4ef6\u5b89\u5168\u7684\u8ba4\u8bc6\u3002\u8bba\u6587\u7edf\u8ba1\u4e86\u6570\u636e\u96c6\u4e2d\u6240\u6709\u7684DKIM\u7b7e\u540d\u3002\u4e0b\u8868\u5c55\u793a\u4e86\u88ab\u9ad8\u9891\u7b7e\u540d\u7684top 10\u90ae\u4ef6\u5934\u5b57\u6bb5\uff0c\u53ef\u4ee5\u770b\u51fa\uff0c\u73b0\u5b9e\u4e2d\u7684\u90ae\u4ef6\u7ba1\u7406\u8005\u5e76\u6ca1\u6709\u5c31\u6b64\u8fbe\u6210\u5171\u8bc6\u3002\u5171\u540c\u7b7e\u540d\u7684\u5b57\u6bb5\u6bd4\u4f8b\u4e0b\u964d\u7684\u975e\u5e38\u5feb\uff0c\u6392\u540d\u7b2c10\u7684reply-to\u5b57\u6bb5\u4ec5\u88ab\u4e0d\u523012%\u7684\u57df\u540d\u7b7e\u540d\u4fdd\u62a4\u3002\u5e76\u4e14\u53ea\u67092.2%\u7684\u57df\u540d\u90e8\u7f72\u4e86RFC 6376\u6240\u63a8\u8350\u7684<em><strong>Oversigning\u4fdd\u62a4\u673a\u5236<\/strong><\/em>\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"569\" src=\"https:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2022\/12\/image-47-1024x569.png\" alt=\"\" class=\"wp-image-5749\" srcset=\"http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-47-1024x569.png 1024w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-47-300x167.png 300w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-47-768x427.png 768w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-47-360x200.png 360w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-47-150x83.png 150w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-47-250x139.png 250w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-47.png 1179w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"text-align:center\">\u56fe\u886811\u00a0\u88abDKIM\u7b7e\u540d\u4fdd\u62a4\u7684\u90ae\u4ef6\u5934\u5b57\u6bb5\u6392\u540d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>b) \u4f7f\u7528\u4e0d\u5b89\u5168\u7684 &#8220;l=&#8221;\u6807\u7b7e\u3002<\/strong>\u5728DKIM\u8bb0\u5f55\u4e2d\uff0cl\u6807\u7b7e\u4e3b\u8981\u662f\u7528\u6765\u8868\u660e\u9700\u8981\u88abDKIM\u7b7e\u540d\u8ba1\u7b97\u7684\u90ae\u4ef6\u6b63\u6587\u957f\u5ea6\u3002\u4f46\u662f &#8220;l=&#8221; \u6807\u7b7e\u7684\u6ee5\u7528\u53ef\u80fd\u4f1a\u5bfc\u81f4DKIM\u534f\u8bae\u88ab\u7ed5\u8fc7\uff0c\u653b\u51fb\u8005\u53ef\u4ee5\u901a\u8fc7\u7ed3\u5408Content-Type\u5934\u5b57\u6bb5\u548c &#8220;l=&#8221; \u6807\u7b7e\u5c31\u53ef\u4ee5\u5b9e\u73b0\u5bf9\u90ae\u4ef6\u6b63\u6587\u5185\u5bb9\u7684\u66ff\u6362\uff0c\u53ef\u4ee5\u5728\u4e0d\u7834\u574fDKIM\u7b7e\u540d\u7684\u60c5\u51b5\u4e0b\u5411\u7ec8\u7aef\u7528\u6237\u663e\u793a\u865a\u5047\u7684\u90ae\u4ef6\u6b63\u6587\u3002\u5c3d\u7ba1\u76f8\u5173\u98ce\u9669\u5728RFC 6376\u4e2d\u5df2\u7ecf\u6709\u6240\u63cf\u8ff0\uff0c\u4f46\u662f\u8bba\u6587\u53d1\u73b0\uff0c\u81f3\u4eca\u8fd8\u67096,860\u4e2a\u57df\u540d\u4f7f\u7528\u8fd9\u79cd\u4e0d\u5b89\u5168\u7684l\u6807\u7b7e\uff0c\u5176\u4e2d\u67091,273\u4e2a\u4e3aAlexa\u6392\u540d\u524d100\u4e07\u7684\u6d41\u884c\u57df\u540d\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"518\" src=\"https:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2022\/12\/image-48-1024x518.png\" alt=\"\" class=\"wp-image-5750\" srcset=\"http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-48-1024x518.png 1024w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-48-300x152.png 300w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-48-768x389.png 768w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-48-150x76.png 150w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-48-250x127.png 250w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2022\/12\/image-48.png 1361w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"text-align:center\">\u56fe\u886812&nbsp;\u5229\u7528\u4e0d\u5b89\u5168\u7684 &#8220;l=&#8221;\u6807\u7b7e\u8fdb\u884c\u90ae\u4ef6\u4f2a\u9020\u653b\u51fb\u7684\u793a\u4f8b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>c) \u4f7f\u7528\u4e0d\u591f\u5b89\u5168\u7684\u54c8\u5e0c\u7b97\u6cd5\uff08SHA-1\uff09<\/strong>\u3002\u54c8\u5e0c\u7b97\u6cd5\u662f\u521b\u5efa\u6570\u5b57\u7b7e\u540d\u7684\u5173\u952e\uff0c\u5176\u6297\u78b0\u649e\u6027\u53ef\u4ee5\u76f4\u63a5\u5f71\u54cd\u6570\u5b57\u7b7e\u540d\u7b97\u6cd5\u7684\u4fdd\u62a4\u6548\u679c\u3002SHA-1\u548cSHA-256\u662fDKIM\u4e2d\u5e38\u7528\u7684\u54c8\u5e0c\u7b97\u6cd5\u3002\u4f46\u662f\u8fd1\u5e74\u6765\u4e00\u7cfb\u5217\u7684\u5de5\u4f5c\u8868\u660e\uff0cSHA-1\u7684\u6297\u78b0\u649e\u6027\u8f83\u5dee\u3002\u57282018\u5e74\uff0cRFC 8301\u5df2\u7ecf\u5efa\u8bae\u4e0d\u518d\u4f7f\u7528rsa-sha1\u6765\u7b7e\u7f72\u6216\u9a8c\u8bc1DKIM\u7b7e\u540d\u3002NIST\u4e5f\u57282011\u5e74\u6b63\u5f0f\u5e9f\u6b62\u4e86SHA-1\u7684\u4f7f\u7528\u3002\u4f46\u662f\u76ee\u524drsa-sha1\u7b97\u6cd5\u4ecd\u7136\u88ab\u73b0\u5b9e\u4e2d\u7684\u90ae\u4ef6\u670d\u52a1\u5e7f\u6cdb\u4f7f\u7528\u3002\u7814\u7a76\u53d1\u73b0\uff0c1,451,956\uff0865.9%\uff09\u4e2a\u57df\u540d\u4ecd\u7136\u4f7f\u7528rsa-sha1\u6765\u751f\u6210DKIM\u7b7e\u540d\uff0c\u5176\u4e2d3,292\u4e2a\u4e3aAlexa\u6392\u540d\u524d100\u7684\u6d41\u884c\u57df\u540d\u3002<br><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>04<\/strong><strong>\u3010\u9632\u5fa1\u5efa\u8bae\u3011<\/strong><br>\u4f5c\u8005\u8054\u7cfb\u4e86\u6240\u6709\u53d7\u5f71\u54cd\u7684\u7535\u5b50\u90ae\u4ef6\u670d\u52a1\u7ba1\u7406\u5458\uff0c\u62a5\u544a\u4e86\u8bba\u6587\u53d1\u73b0\u7684\u5b89\u5168\u95ee\u9898\u3002\u5176\u4e2d\uff0c4\u5bb6\u7535\u5b50\u90ae\u4ef6\u4f9b\u5e94\u5546\u548c24\u5bb6\u76f8\u5173\u7684\u7535\u5b50\u90ae\u4ef6\u7ba1\u7406\u5458\u627f\u8ba4\u4e86\u5b89\u5168\u95ee\u9898\u7684\u5b58\u5728\uff0cZoho.com\u8fd8\u63d0\u4f9b\u4e86200\u7f8e\u5143\u7684\u6f0f\u6d1e\u5956\u52b1\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f5c\u8005\u5f00\u53d1\u4e86\u4e00\u4e2a\u5728\u7ebf\u6d4b\u8bd5\u5de5\u5177\uff08https:\/\/nospoofing.cn\uff09\uff0c\u5e2e\u52a9\u7535\u5b50\u90ae\u4ef6\u7ba1\u7406\u5458\u9a8c\u8bc1\u548c\u90e8\u7f72\u5176DKIM\u8bb0\u5f55\uff0c\u671f\u671b\u6539\u5584DKIM\u90e8\u7f72\u7684\u73b0\u72b6\u3002\u8bba\u6587\u4e5f\u5bf9DKIM\u7684\u534f\u8bae\u8bbe\u8ba1\u548c\u534f\u8bae\u5b9e\u73b0\u63d0\u51fa\u4e86\u4e24\u9879\u5efa\u8bae\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1. DKIM Key Expiration Date\u3002<\/strong>&nbsp;\u5728DKIM\u8bb0\u5f55\u4e2d\u589e\u52a0\u4e00\u4e2aDKIM\u5bc6\u94a5\u8fc7\u671f\u65e5\u671f\u7684\u5b57\u6bb5\uff0c\u5e2e\u52a9\u7f13\u89e3\u8fc7\u6e21\u671f\u4e0d\u660e\u786e\u7684\u95ee\u9898\uff0c\u4fc3\u8fdb\u5bc6\u94a5\u7684\u5b9a\u671f\u66f4\u6362\u3002\u53d1\u9001\u670d\u52a1\u53ef\u4ee5\u81ea\u4e3b\u51b3\u5b9a\u662f\u5426\u4f7f\u7528\u8fd9\u4e2a\u5b57\u6bb5\u3002\u5982\u679c\u53d1\u9001\u65b9\u652f\u6301\u8be5\u5b57\u6bb5\uff0c\u90ae\u4ef6\u63a5\u6536\u65b9\u5728\u9a8c\u8bc1DKIM\u7b7e\u540d\u65f6\uff0c\u5e94\u8be5\u9996\u5148\u6839\u636e\u8fd9\u4e2a\u5b57\u6bb5\u6765\u786e\u5b9a\u5f53\u524d\u6536\u5230\u7684\u90ae\u4ef6\u7684DKIM\u7b7e\u540d\u662f\u5426\u6709\u6548\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2. Default Oversigning Mechanism\u3002<\/strong>Oversigning\u673a\u5236\u662f\u4e00\u79cd\u6709\u6548\u4fdd\u62a4\u7528\u6237\u514d\u53d7DKIM\u91cd\u653e\u653b\u51fb\u7684\u9632\u5fa1\u673a\u5236\u3002\u4f46\u662f\u7814\u7a76\u7ed3\u679c\u663e\u793a\uff0c\u73b0\u5b9e\u4e2d\u91c7\u7528\u8be5\u673a\u5236\u7684\u90ae\u4ef6\u670d\u52a1\u5e76\u4e0d\u591a\u3002\u56e0\u6b64\uff0c\u6700\u597d\u7684\u65b9\u6cd5\u662f\u6539\u53d8\u6d41\u884c\u7684DKIM\u5e93\u7684\u5b9e\u73b0\uff0c\u5728\u7b7e\u7f72DKIM\u7b7e\u540d\u65f6\u9ed8\u8ba4\u91c7\u7528Oversigning\u7b56\u7565\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u8ff0\u4e24\u9879\u63aa\u65bd\u6709\u52a9\u4e8e\u63d0\u9ad8DKIM\u7684\u4fdd\u62a4\u6548\u679c\uff0c\u4f7fDKIM\u7b7e\u540d\u514d\u53d7\u91cd\u653e\u653b\u51fb\u7684\u5f71\u54cd\uff0c\u5e76\u4e0d\u4f1a\u5bf9\u73b0\u6709\u7684\u534f\u8bae\u90e8\u7f72\u4ea7\u751f\u989d\u5916\u5f71\u54cd\u3002<br><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>05<\/strong><strong>\u3010\u603b\u7ed3\u3011<\/strong><br>\u8bba\u6587\u9996\u6b21\u5bf9\u771f\u5b9e\u4e92\u8054\u7f51\u4e2dDKIM\u534f\u8bae\u7684\u90e8\u7f72\u73b0\u72b6\u8fdb\u884c\u4e86\u5927\u89c4\u6a21\u7684\u6d4b\u91cf\uff0c\u63ed\u793a\u4e86DKIM\u534f\u8bae\u7684\u5b9e\u73b0\u548c\u90e8\u7f72\u5b58\u5728\u6f5c\u5728\u7684\u5b89\u5168\u98ce\u9669\u3002\u7814\u7a76\u53d1\u73b0\uff0cAlexa\u524d100\u4e07\u57df\u540d\u4e2d\u670928.1%\u7684\u57df\u540d\u5df2\u7ecf\u542f\u7528\u4e86DKIM\u3002\u7136\u800c\uff0cDKIM\u7684\u7ba1\u7406\u4e0d\u5584\u5728\u7535\u5b50\u90ae\u4ef6\u751f\u6001\u7cfb\u7edf\u4e2d\u4ecd\u7136\u666e\u904d\u5b58\u5728\uff0c\u5305\u62ec\u8bed\u6cd5\u9519\u8bef\u3001DKIM\u5bc6\u94a5\u7ba1\u7406\u95ee\u9898\u548c\u4e0d\u5b89\u5168\u7684DKIM\u7b7e\u540d\u7b49\u95ee\u9898\uff0c\u524a\u5f31\u4e86DKIM\u5bf9\u4e8e\u90ae\u4ef6\u5b89\u5168\u7684\u4fdd\u62a4\uff0c\u7ed9\u7535\u5b50\u90ae\u4ef6\u7528\u6237\u5e26\u6765\u4e86\u4e25\u91cd\u7684\u5b89\u5168\u98ce\u9669\u3002\u4e3a\u7f13\u89e3\u76f8\u5173\u5b89\u5168\u98ce\u9669\uff0c\u4f5c\u8005\u5411\u76f8\u5173\u5382\u5546\u6c47\u62a5\u4e86\u5b89\u5168\u6f0f\u6d1e\uff0c\u5e76\u63d0\u4f9b\u4e86\u4e00\u4e2a\u5728\u7ebf\u5de5\u5177\uff08nospoofing.cn\uff09\u5e2e\u52a9\u90ae\u4ef6\u7ba1\u7406\u5458\u9a8c\u8bc1\u548c\u90e8\u7f72\u5176DKIM\u8bb0\u5f55\u3002\u8bba\u6587\u7814\u7a76\u6210\u679c\u6709\u52a9\u4e8e\u6539\u5584DKIM\u7684\u90e8\u7f72\u73b0\u72b6\uff0c\u51cf\u5c0f\u90ae\u4ef6\u4f2a\u9020\u653b\u51fb\u7684\u5371\u5bb3\uff0c\u63d0\u9ad8\u7535\u5b50\u90ae\u4ef6\u751f\u6001\u7cfb\u7edf\u7684\u6574\u4f53\u5b89\u5168\u6027\u3002<br>\u539f\u6587\u94fe\u63a5https:\/\/www.usenix.org\/system\/files\/sec22-wang-chuhan.pdf<br>\u539f\u4f5c\u8005&nbsp;PPT \u94fe\u63a5https:\/\/www.usenix.org\/system\/files\/sec22_slides-wang_chuhan.pdf<br><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u53c2\u8003\u6587\u732e<br>[1]Scott Kitterman. Sender policy framework (SPF) for authorizing use of domains in email, version 1. RFC, 7208:1\u201364, 2014.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">[2]&nbsp;Dave Crocker, Tony Hansen, and Murray S. Kucherawy. Domainkeys identified mail (DKIM) signatures. RFC, 6376:1\u201376, 2011.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">[3] Murray S. Kucherawy and Elizabeth D. Zwicky. Domain-based message authentication, reporting, and conformance (DMARC). RFC, 7489:1\u201373, 2015.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">[4] Zakir Durumeric, David Adrian, Ariana Mirian, James Kasten, Elie Bursztein, Nicolas Lidzborski, Kurt Thomas, Vijay Eranti, Michael Bailey, and J. Alex Halderman. Neither snow nor rain nor MITM&#8230;: an empirical analysis of email delivery security. (IMC 2015)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">[5] &nbsp;Ian D. Foster, Jon Larson, Max Masich, Alex C. Snoeren, Stefan Savage, and Kirill Levchenko. Security by any other name: On the effectiveness of provider based email security . (CCS 2015).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">[6] &nbsp;Hang Hu and Gang Wang. End-to-end measurements of email spoofing attacks. (USENIX Security 2018).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4eca\u5929\u5206\u4eab\u7684\u8bba\u6587\u4e3b\u9898\u4e3a\u90ae\u4ef6\u534f\u8bae\u5b89\u5168\uff0c\u7531\u6765\u81ea\u6e05\u534e\u5927\u5b66\u3001\u534e\u5317\u8ba1\u7b97\u6280\u672f\u7814\u7a76\u6240\u3001\u5947\u5b89\u4fe1\u53caCoremail\u7684\u7814\u7a76\u4eba\u5458\u5171\u540c\u5b8c\u6210\u3002DomainKeys Identified Mail\uff08DKIM\uff09\u662f\u4e00\u4e2a\u7528\u4e8e\u4fdd\u62a4\u7535\u5b50\u90ae\u4ef6\u5185\u5bb9\u7684\u5b8c\u6574\u6027\u8ba4\u8bc1\u534f\u8bae\u3002\u8be5\u534f\u8bae2011\u5e74\u88ab\u6b63\u5f0f\u6807\u51c6\u5316[2]\uff0c\u76ee\u524d\u5df2\u88ab\u96c5\u864e\u3001\u8c37\u6b4c\u548c\u5176\u4ed6\u77e5\u540d\u7535\u5b50\u90ae\u4ef6\u670d\u52a1\u63d0\u4f9b\u5546\u6240\u91c7\u7528\u3002\u7531\u4e8eDKIM\u534f\u8bae\u7684\u7279\u6027\uff0c\u5bf9\u5176\u8fdb\u884c\u5927\u89c4\u6a21\u6d4b\u91cf\u662f\u975e\u5e38\u56f0\u96be\u7684\u3002\u56e0\u6b64\uff0cDKIM\u7684\u73b0\u5b9e\u90e8\u7f72\u60c5\u51b5\u53ca\u53ef\u80fd\u5b58\u5728\u7684\u5b89\u5168\u98ce\u9669\u957f\u671f\u7f3a\u4e4f\u5ba2\u89c2\u800c\u4e25\u8c28\u7684\u5206\u6790\u7814\u7a76\u3002\u8bba\u6587\u9996\u6b21\u5bf9DKIM\u534f\u8bae\u7684\u90e8\u7f72\u60c5\u51b5\u8fdb\u884c\u4e86\u5927\u89c4\u6a21\u6d4b\u91cf\uff0c\u5e76\u6df1\u5165\u5206\u6790\u5176\u5b89\u5168\u95ee\u9898\u3002 <a class=\"continue-reading-link\" href=\"http:\/\/202.112.238.40\/wp\/?p=5735\"> Continue reading <span class=\"meta-nav\">&rarr; <\/span><\/a><\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-5735","post","type-post","status-publish","format-standard","hentry","category-research"],"_links":{"self":[{"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=\/wp\/v2\/posts\/5735","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5735"}],"version-history":[{"count":1,"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=\/wp\/v2\/posts\/5735\/revisions"}],"predecessor-version":[{"id":5751,"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=\/wp\/v2\/posts\/5735\/revisions\/5751"}],"wp:attachment":[{"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5735"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5735"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5735"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}