{"id":1841,"date":"2017-03-28T01:00:25","date_gmt":"2017-03-28T01:00:25","guid":{"rendered":"https:\/\/www.inforsec.org\/wp\/?p=1841"},"modified":"2017-03-28T01:01:31","modified_gmt":"2017-03-28T01:01:31","slug":"ssltls%e7%9a%84%e8%bf%91%e5%b9%b4%e7%9b%b8%e5%85%b3%e6%94%bb%e5%87%bb%e7%a0%94%e7%a9%b6%e7%bb%bc%e8%bf%b0%ef%bc%88%e4%b8%89%ef%bc%89","status":"publish","type":"post","link":"http:\/\/202.112.238.40\/wp\/?p=1841","title":{"rendered":"SSL\/TLS\u7684\u8fd1\u5e74\u76f8\u5173\u653b\u51fb\u7814\u7a76\u7efc\u8ff0\uff08\u4e09\uff09"},"content":{"rendered":"

SSL\/TLS\u7684\u8fd1\u5e74\u76f8\u5173\u653b\u51fb\u7814\u7a76\u7efc\u8ff0\uff08\u4e09\uff09<\/strong><\/p>\n

\u534f\u8bae\u8bbe\u8ba1\u4e0d\u8db3\u7684\u6f0f\u6d1e (\u9488\u5bf9RC4\u00a0\u7684\u653b\u51fb)<\/strong><\/p>\n

\u4f5c\u8005\uff1a\u97e6\u4fca\u7433 \u00a0\u6e05\u534e\u5927\u5b66<\/p>\n

\u7b80\u4ecb<\/b><\/strong><\/h3>\n

\u6211\u4eec\u5728\u524d\u9762\u4e00\u6587\uff0c\u4ecb\u7ecd\u4e86SSL\/TLS\u5728\u534f\u8bae\u52a0\u5bc6\u65b9\u5f0f\u65b9\u9762\uff0c\u5b58\u5728\u7684\u4e00\u4e9b\u53ef\u4ee5\u88ab\u5229\u7528\u6f0f\u6d1e\u3002\u672c\u6587\u7efc\u5408\u4ecb\u7ecdSSL\/TLS\u4f7f\u7528RC4\u7b97\u6cd5\u52a0\u5bc6\u65f6\uff0c\u53ef\u80fd\u4ea7\u751f\u7684\u653b\u51fb\u65b9\u5f0f\u3002\u6211\u4eec\u9996\u5148\u7b80\u5355\u4ecb\u7ecdRC4\u52a0\u5bc6\u7684\u5de5\u4f5c\u539f\u7406\uff0c\u7136\u540e\u4ecb\u7ecd\u9488\u5bf9RC4\u7684\u653b\u51fb\u7684\u53d1\u5c55\u8fc7\u7a0b\u4ee5\u53ca\u5e94\u5bf9\u7b56\u7565\u3002<\/h3>\n

<\/p>\n

RC4\u52a0\u5bc6\u539f\u7406<\/strong><\/h3>\n

RC4\u662fRon Rivest\u57281987\u5e74\u8bbe\u8ba1\u7684\u52a0\u5bc6\u7b97\u6cd5\uff0c\u4f5c\u4e3a\u4e00\u79cd\u8f83\u65e9\u51fa\u73b0\u4ecd\u88ab\u5927\u91cf\u4f7f\u7528\u7684\u9ad8\u6548\u52a0\u5bc6\u7b97\u6cd5\u3002\u7531\u4e8e\u5bf9CBC\u6a21\u5f0f\u7684\u653b\u51fb\u5927\u91cf\u51fa\u73b0\uff0c\u52a0\u5bc6\u65b9\u5f0f\u7684\u91cd\u5fc3\u5f00\u59cb\u8f6c\u79fb\u5230RC4\uff0c\u4f7f\u5f97RC4\u5f00\u59cb\u5e7f\u6cdb\u7684\u53d7\u5230\u5173\u6ce8\uff0c\u4e5f\u5f00\u59cb\u88ab\u5927\u91cf\u7814\u7a76\u4eba\u5458\u91cd\u89c6\u3002\u867d\u7136\u65e9\u57282001\u5e74\uff0cRC4\u5c31\u88abFluhrer, Mantin\u548cShamir\u7b49\u7814\u7a76\u4eba\u5458\u8bc1\u660e\u5176\u5bc6\u94a5\u8c03\u5ea6\u7b97\u6cd5\u5b58\u5728\u7f3a\u9677[1]\u3002\u5728\u5206\u6790\u5927\u91cf\u7684\u5f31\u5bc6\u94a5\u540e\uff0c\u53d1\u73b0\u5bc6\u94a5\u4e2d\u7684\u5c11\u91cf\u5173\u952e\u4f4d\u7f6e\u5bf9\u5f71\u54cd\u5927\u91cf\u521d\u59cb\u72b6\u6001\u8f93\u51fa\u4f4d\u503c\u5177\u6709\u4e0d\u53ef\u5ffd\u7565\u7684\u6982\u7387\u4f5c\u7528\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5982\u679c\u5229\u7528\u67d0\u4e9b\u4f4d\u7f6e\u7684\u5df2\u77e5\u660e\u6587\uff08\u5982HTTP\u62a5\u5934\u56fa\u5b9a\u503c\uff09\u7834\u89e3\u5bc6\u94a5\u6d41\u7684\u4e00\u90e8\u5206\u5185\u5bb9\uff0c\u53ef\u4ee5\u88ab\u653e\u5927\u5229\u7528\u5230\u7834\u89e3\u5176\u4ed6\u6d41\u4e0a\u7684\u5bf9\u5e94\u4f4d\u7f6e\u3002\u7406\u8bba\u7a81\u7834\u5230\u5b9e\u9645\u5e94\u7528\u5f80\u5f80\u4f1a\u5b58\u5728\u7740\u4e00\u6bb5\u8ddd\u79bb\uff0c\u800c\u8fd1\u51e0\u5e74\u5bf9RC4\u7684\u7814\u7a76\u66f4\u52a0\u6df1\u5165\u3002\u7814\u7a76\u4eba\u5458\u4eec\u6784\u9020\u4e86\u4e00\u4e9b\u80fd\u591f\u5b9e\u9645\u6d4b\u91cf\u7684\u653b\u51fb\uff0c\u52a0\u901f\u4e86RC4\u5728TLS\u5e94\u7528\u4e0a\u7684\u9000\u5f79\u3002<\/p>\n

RC4\u4ece\u8bbe\u8ba1\u4e4b\u521d\u5230\u73b0\u5728\u5e94\u7528\u4e00\u76f4\u975e\u5e38\u5e7f\u6cdb\uff0c\u539f\u56e0\u5c31\u5728\u4e8e\u5176\u52a0\u5bc6\u65b9\u5f0f\u7b80\u5355\uff0c\u6548\u7387\u975e\u5e38\u9ad8\uff0c\u5728\u7ebf\u4e0a\u5b9e\u65f6\u901a\u8baf\u52a0\u89e3\u5bc6\u7b49\u65b9\u9762\u8d77\u7740\u81f3\u5173\u91cd\u8981\u7684\u4f5c\u7528\u3002\u5982\u56fe3-1\u6240\u793a\uff0cRC4\u7684\u52a0\u5bc6\u539f\u7406\u5e76\u4e0d\u590d\u6742\uff0c\u52a0\u5bc6\u7b97\u6cd5\u4e3b\u8981\u5206\u6210\u4e24\u90e8\u5206\u3002\u7b2c\u4e00\u90e8\u5206\u662f\u5bc6\u94a5\u8c03\u5ea6\u7b97\u6cd5(KSA) \uff0c\u901a\u8fc7\u5bc6\u94a5key \u6765\u521d\u59cb\u5316S \u72b6\u6001\u3002\u7136\u540e\u7b2c\u4e8c\u90e8\u5206\u662f\u4f2a\u968f\u673a\u6570\u751f\u6210\u7b97\u6cd5(PRGA)\uff0c\u901a\u8fc7\u4f7f\u7528KSA\u521d\u59cb\u5316\u540e\u7684S\uff0c\u751f\u6210\u4f2a\u968f\u673a\u5e8f\u5217\uff0c\u66f4\u65b0S\uff0c\u5982\u56fe3-2 \u6240\u793a\uff08\u6765\u6e90\u4e8eGoogle\uff09\u3002<\/p>\n

\"\"<\/p>\n

\u56fe3-1 RC4 \u52a0\u5bc6\u7b97\u6cd5<\/p>\n

\"\"<\/p>\n

\u56fe3-2 RC4\u52a0\u5bc6<\/p>\n

AlFardan\u7b49\u5728[2]\u4e2d\u5206\u6790\u4e86RC4\u7684\u5b89\u5168\u6027\u548c\u8fd1\u51e0\u5e74\u6765RC4\u51fa\u73b0\u7684\u79cd\u79cd\u72b6\u51b5\uff0c\u5f53RC4\u88ab\u7528\u4e8eTLS\u52a0\u5bc6\u65f6\uff0c\u4f5c\u8005\u8bbe\u8ba1\u4e86\u5b9e\u9a8c\u5bf9TLS\u8fdb\u884c\u4e86\u7eaf\u5bc6\u6587\u6587\u672c\u6062\u590d\u653b\u51fb\u3002\u63d0\u4f9b\u4e86\u4e24\u79cd\u660e\u6587\u6062\u590d\u653b\u51fb\u65b9\u6cd5\uff0c\u800c\u4e14\u8fd9\u4e9b\u653b\u51fb\u4e5f\u53ef\u4ee5\u5b9e\u9645\u5e94\u7528\u4e8eRC4\u52a0\u5bc6\u7684TLS\u4f1a\u8bdd\u4e2d\u3002\u5176\u4e2d\u4e3b\u8981\u6839\u636eMantin\u548cShamir \u7b49\u4eba\u5728RC4\u6d41\u4e2d\u53d1\u73b0\u7684\u4e24\u4e2a\u504f\u5dee\u8fdb\u884c\u7684\u8bbe\u8ba1\u3002<\/p>\n

\u5355\u5b57\u8282\u504f\u5dee\u653b\u51fb<\/strong><\/h3>\n

RC4\u5728\u5bc6\u7801\u5b66\u4e2d\u5b58\u5728\u6700\u91cd\u8981\u7684\u95ee\u9898\u5c31\u662f\u52a0\u5bc6\u504f\u5dee\u95ee\u9898\u3002Mantin\u7b49\u4eba\u901a\u8fc7\u7edf\u8ba1\u5206\u6790\uff0c\u8d1d\u53f6\u65af\u5206\u6790\u7b49\u65b9\u6cd5[3]\u53d1\u73b0\u5bc6\u94a5\u6d41\u4e2d\u7684\u7b2c\u4e8c\u5b57\u8282\u503e\u5411\u4e8e\u4e3a0\u7684\u6982\u7387\u6bd4\u4e00\u822c\u60c5\u51b5\u8981\u9ad8\uff0c\u4e3a1\/128\u800c\u4e0d\u662f\u6b63\u5e38\u76841\/256\u3002<\/p>\n

\"\"<\/p>\n

\u56fe 3-3 RC4\u52a0\u5bc6\u4e2d\u5f00\u59cb\u4e24\u8f6eS0<\/sub>[2]=0 \u800cS0<\/sub>[1] 0<\/p>\n

\u5728S\u521d\u59cb\u5316\u7ed3\u675f\u751f\u6210\u5bc6\u94a5\u6d41\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6700\u521d\uff0ci\u548cj\u4e3a0\u3002\u7528X\u8868\u793aS0 <\/sub>[1]\uff0c\u5219\u5728\u7b2c\u4e00\u8f6e\u4e2d\u5c06i\u66f4\u65b0\u4e3a1\uff0c\u5e76\u5c06j\u66f4\u65b0\u4e3a0 + S0 <\/sub>[1] = X\uff0c\u5e76\u4e14\u4f4d\u7f6e\u7684\u5185\u5bb9X\u548cY\u4e5f\u53731\u548cX\u88ab\u4ea4\u6362\u3002\u7b2c\u4e00\u4e2a\u8f93\u51fa\u662fS1 <\/sub>[X + Y]\uff0c\u5b83\u53ef\u4ee5\u662f\u5177\u6709\u57fa\u672c\u4e0a\u5747\u5300\u6982\u7387\u5206\u5e03\u7684\u4efb\u4f55\u503c\u3002\u73b0\u5728\u4f7f\u7528S0<\/sub>\u00a0[2] = 0\u7684\u5047\u8bbe\u3002\u5728\u7b2c\u4e8c\u8f6e\u4e2d\uff0ci\u88ab\u9012\u589e\u52302\uff0c\u5e76\u4e14j\u589e\u52a0\u5230X + 0 = X\uff0c\u56e0\u6b64\u6211\u4eec\u4ea4\u6362\u4f4d\u7f6e2\u548cX\u7684\u503c0\u548cX\uff0c\u5e76\u4e14\u8f93\u51faS2 <\/sub>[X + 0] = S2<\/sub>\u00a0[X] = 0\u3002\u4ee5\u4e0b\u8bc1\u660e\uff0c\u5bf9\u4e8e\u5927\u7ea61 \/ N\u7684\u5bc6\u94a5\uff0c\u7b2c\u4e8c\u4e2a\u8f93\u51fa\u4e3a0\uff0c\u6982\u7387\u4e3a1\uff0c\u800c\u5bf9\u4e8e\u5176\u4ed6\u76841 – 1 \/ N\u4e2a\u5bc6\u94a5\uff0c\u7b2c\u4e8c\u4e2a\u8f93\u51fa\u4e3a0\uff0c\u6982\u7387\u4e3a1 \/ N \u5747\u5300\u5206\u5e03\uff09\u3002\u7ed3\u679c\uff0c\u7b2c\u4e8c\u4f4d\u7f6e\u8f93\u51fa\u4e3a0\u7684\u603b\u6982\u7387\u4e3a\uff1a<\/p>\n

\u8fd9\u79cd\u7c7b\u578b\u7684\u504f\u5dee\u5728\u5bc6\u7801\u5b66\u4e2d\u662f\u6781\u5176\u5371\u9669\u7684\uff0c\u53ea\u8981\u77e5\u9053\u4e86RC4\u5bc6\u94a5\u6d41\u4e2d\u7684\u7b2c\u4e8c\u5b57\u8282\u503e\u5411\u4e8e0\uff0c\u90a3\u4e48\u5c31\u80fd\u591f\u77e5\u9053\u7ecf\u8fc7\u52a0\u5bc6\u7684\u5bc6\u6587\u7684\u7b2c\u4e8c\u5b57\u8282\u3002\u5176\u4ed6\u5b58\u5728\u504f\u5dee\u7684\u5b57\u8282\u4e5f\u662f\u540c\u6837\u7684\u3002\u5982\u679c\u8981\u5728TLS\u4e2d\u8fdb\u884c\u653b\u51fb\uff0c\u9700\u8981\u5efa\u7acb\u591a\u4e2a\u8fde\u63a5\uff0c\u83b7\u53d6\u76f8\u540c\u660e\u6587\u88ab\u591a\u79cd\u4e0d\u540c\u5bc6\u94a5\u52a0\u5bc6\u7684\u5bc6\u6587\u6570\u636e\u3002\u89c2\u5bdf\u7b2c\u4e8c\u5b57\u8282\u7684\u503c\uff0c\u5982\u679c\u51fa\u73b0\u9891\u7387\u8f83\u9ad8\uff0c\u90a3\u4e48\u8fd9\u4e2a\u503c\u5f88\u53ef\u80fd\u5c31\u662f\u660e\u6587\u5185\u5bb9\u4e2d\u7684\u76f8\u540c\u503c\u3002<\/p>\n

\u5728AlFardan\u00a0\u7b49\u4eba\u53d1\u8868\u7684\u8bba\u6587[2]\u4e2d\uff0c\u5176\u4e2d\u4e00\u4e2a\u653b\u51fb\u901a\u8fc7\u5206\u6790244<\/sup>\u4e2aRC4\u5bc6\u94a5\u7684\u5bc6\u94a5\u6d41\uff0c\u53d1\u73b0\u5728\u6700\u5f00\u59cb\u7684256\u4e2a\u5b57\u8282\u4e2d\u90fd\u5b58\u5728\u7740\u591a\u79cd\u504f\u5dee\u3002\u4ed6\u4eec\u901a\u8fc7\u6539\u8fdb\u7b97\u6cd5\uff0c\u5206\u522b\u5904\u7406\u4e0d\u540c\u4f4d\u7f6e\u7684\u591a\u79cd\u504f\u5dee\u3002\u6700\u540e\u7684\u6548\u679c\u80fd\u591f\u8fbe\u5230\u5728232<\/sup>\u4e2a\u6570\u636e\u6837\u672c\u4e0b\uff0c\u7834\u89e3\u5168\u90e8256\u5b57\u8282\u7684\u5185\u5bb9\u80fd\u591f\u8fbe\u5230100\u3002\u800c\u4e14\u5728\u88ab\u653b\u51fb\u5b57\u7b26\u5b58\u5728\u5df2\u77e5\u90e8\u5206\u7684\u60c5\u51b5\u4e0b\uff0c\u6570\u636e\u6837\u672c\u7684\u6570\u91cf\u80fd\u51cf\u5c11\u5230228<\/sup>\uff0c\u8fdc\u4f4e\u4e8e\u5e94\u8be5\u5b58\u5728\u76842128<\/sup>\u7684\u5b89\u5168\u6027\u3002<\/p>\n

\u5728\u73b0\u5b9e\u751f\u6d3b\u4e2d\uff0c\u8fd9\u79cd\u653b\u51fb\u6682\u65f6\u8fd8\u662f\u5f88\u96be\u5b9e\u65bd\u7684\u3002\u56e0\u4e3a\u6700\u5c11\u9700\u8981\u6536\u96c6228<\/sup>\u4e2a\u6570\u636e\u6837\u672c\uff0c\u88ab\u52a8\u653b\u51fb\u5f88\u96be\u5728\u5408\u7406\u7684\u65f6\u95f4\u5185\u7b26\u5408\u8981\u6c42\u3002\u5c31\u7b97\u6bcf\u79d2\u8fdb\u884c\u4e00\u6b21\u8fde\u63a5\uff0c\u4e5f\u9700\u89818\u5e74\u5de6\u53f3\u7684\u65f6\u95f4\u624d\u80fd\u6536\u96c6\u9f50\u3002\u6240\u4ee5\u53ea\u6709\u8fdb\u884c\u4e3b\u52a8\u653b\u51fb\uff0c\u901a\u8fc7\u6ce8\u5165JavaScript\u6076\u610f\u811a\u672c\u8fdb\u884c\u4e2d\u95f4\u4eba\u653b\u51fb\u3002\u800c\u4e14\u80fd\u7834\u89e3\u7684\u5185\u5bb9\u662f\u524d256\u5b57\u8282\uff0c\u5982\u679c\u6d4f\u89c8\u5668\u628a\u6709\u6548\u5185\u5bb9\u653e\u5230256\u5b57\u8282\u540e\uff0c\u8fd9\u4e2a\u653b\u51fb\u5c31\u5f88\u96be\u5f97\u5230\u6709\u6548\u7684\u5185\u5bb9\u3002<\/p>\n

\u53cc\u5b57\u8282\u504f\u5dee<\/strong><\/h3>\n

\u9664\u4e86\u5355\u5b57\u8282\u504f\u5dee\uff0c\u5728RC4\u6d41\u4e2d\u8fd8\u53d1\u73b0\u4e86\u5b58\u5728\u591a\u5b57\u8282\u504f\u5dee\u3002\u4e0e\u5355\u5b57\u8282\u504f\u79fb\u76f8\u53cd\uff0c\u5927\u591a\u6570\u6240\u8bc6\u522b\u7684\u591a\u5b57\u8282\u504f\u79fb\u4e0d\u662f\u5355\u4e00\u4f4d\u7f6e\uff0c\u800c\u662f\u4ee5\u89c4\u5219\u95f4\u9694\u5468\u671f\u6027\u8fde\u7eed\u51fa\u73b0\u5728\u52a0\u5bc6\u6d41\u4e2d\u3002<\/p>\n

\u5728AlFardan\u7b49\u4eba\u53d1\u5e03\u7684\u7b2c\u4e8c\u4e2a\u653b\u51fb\u4e2d\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528\u53cc\u5b57\u8282\u504f\u5dee\u6765\u7834\u89e3\u660e\u6587\u3002\u5229\u7528\u53cc\u5b57\u8282\u8fdb\u884c\u653b\u51fb\u65f6\u4e0d\u9700\u8981\u5927\u91cf\u4e0d\u540c\u7684RC4\u5bc6\u94a5\u52a0\u5bc6\u7684\u6837\u672c\uff0c\u5728\u540c\u4e00\u4e2a\u8fde\u63a5\u4e0a\u80fd\u591f\u83b7\u53d6\u591a\u4e2a\u6837\u672c\uff0c\u4ece\u800c\u6709\u6548\u7684\u51cf\u5c11\u4e86\u9700\u8981\u5efa\u7acb\u7684\u8fde\u63a5\u6570\u3002\u800c\u53cc\u5b57\u8282\u653b\u51fb\u80fd\u591f\u572813*230<\/sup>\u4e2a\u6570\u636e\u6837\u672c\u4e0b\uff0c\u7834\u89e316\u5b57\u8282\u7684\u660e\u6587\u6570\u636e\u5185\u5bb9\u3002\u4e3a\u4e86\u4f7f\u76ee\u6807cookie\u5904\u4e8eTLS\u6d88\u606f\u4e2d\u7684\u56fa\u5b9a\u4f4d\u7f6e\uff0c\u4f5c\u8005\u5728HTTP\u5934\u4e2d\u6dfb\u52a0\u4e86\u586b\u5145\uff0c\u8fd9\u4f7f\u5f97\u52a0\u5bc6\u7684POST\u8bf7\u6c42\u8fbe\u5230512\u5b57\u8282\uff0c\u8fd9\u4e5f\u4ea7\u751f\u4e86\u4e00\u4e9b\u989d\u5916\u7684\u5f00\u9500\u3002\u6309\u7167\u6bcf\u5c0f\u65f6\u751f\u6210600\u4e07\u4e2a\u5bc6\u6587\u7684\u901f\u5ea6\u8fdb\u884c\u5b9e\u9a8c\uff0c\u9700\u8981\u5927\u7ea62000\u5c0f\u65f6\u6765\u6536\u96c6\u6570\u636e\u3002\u8fd9\u4e2a\u653b\u51fb\u6784\u9020\u4ea7\u751f\u4e86\u5927\u91cf\u7684\u7f51\u7edc\u6d41\u91cf\uff0c\u5728\u5b9e\u9645\u7f51\u7edc\u4e2d\uff0c\u8fd9\u4e2a\u653b\u51fb\u6682\u65f6\u4e5f\u4e0d\u80fd\u6784\u6210\u5a01\u80c1\uff0c\u4f46\u662f\u8bc1\u5b9e\u4e86\u53cc\u5b57\u8282\u504f\u5dee\u786e\u5b9e\u53ef\u4ee5\u88ab\u5229\u7528\u3002<\/p>\n

\u653b\u51fb\u6539\u8fdb<\/strong><\/h3>\n

\u5728[6]\u4e2d\uff0c\u4f5c\u8005\u63d0\u51fa\u4e0d\u53d8\u6027\u5f31\u70b9(Invariance Weakness)\uff0c\u8fd9\u662fRC4\u52a0\u5bc6\u4e2d\u7684\u5b58\u5728\u7684L\u5f62\u952e\u6a21\u5f0f\u3002\u5b83\u4e00\u65e6\u5b58\u5728\u4e8eRC4\u952e\u4e2d\uff0c\u5728\u6574\u4e2a\u521d\u59cb\u5316\u8fc7\u7a0b\u4e2d\u4f1a\u4fdd\u6301\u90e8\u5206\u7f6e\u6362\u72b6\u6001\u3002\u5f53\u7531PRGA\u7b97\u6cd5\u5904\u7406\u65f6\uff0c\u8be5\u5b8c\u6574\u90e8\u5206\u5305\u62ec\u7f6e\u6362\u7684\u6700\u4f4e\u6709\u6548\u4f4d\uff0c\u901a\u8fc7\u6d41\u7684\u957f\u524d\u7f00\u786e\u5b9a\u6240\u79f0\u4f2a\u968f\u673a\u8f93\u51fa\u6d41\u7684\u6700\u4f4e\u6709\u6548\u4f4d\uff0c\u5982\u56fe3-4\u6240\u793a\u3002\u8fd9\u4e9b\u5b58\u5728\u504f\u5dee\u7684\u6d41\u5b57\u8282\u4e0e\u660e\u6587\u5b57\u8282\u8fdb\u884c\u5f02\u6216\u8fd0\u7b97\uff0c\u5bfc\u81f4\u4ece\u5bc6\u6587\u5230\u660e\u6587\u7684\u8f6c\u6362\u5b58\u5728\u7740\u6cc4\u6f0f\u3002\u8fd9\u4e9b\u6a21\u5f0f\u901a\u5e38\u53d1\u751f\u5728\u4e0d\u540c\u6570\u91cf\u7684LSB(Least significant bits)\uff0c\u5355\u4e2aLSB\uff0c2\u4e2aLSB\uff0c3\u4e2aLSB\u81f37\u4e2aLSB\uff0c\u5206\u522b\u5bfc\u81f4\u4e0d\u540c\u7c7b\u522b\u7684\u5f31RC4\u5bc6\u94a5\u3002<\/p>\n

\"\"<\/p>\n

\u56fe3-4 Invariance\u00a0Weakness<\/p>\n

SSL\u534f\u8bae\u5728\u8bb8\u591a\u5bc6\u7801\u5957\u4ef6\u4e2d\u4f7f\u7528RC4\u8fdb\u884c\u52a0\u5bc6\u3002\u5728\u63e1\u624b\u534f\u8bae\u4e2d\uff0c\u4e3a\u4e0a\u6e38\u548c\u4e0b\u6e38\u901a\u4fe1\u751f\u6210RC4\u52a0\u5bc6\u5bc6\u94a5\u3002\u5728\u8bb0\u5f55\u534f\u8bae\u4e2d\uff0c\u4e0a\u6e38\u5bc6\u94a5\u7528\u4e8e\u5ba2\u6237\u7aef\u5230\u670d\u52a1\u5668\u901a\u4fe1\u7684\u52a0\u5bc6\uff0c\u800c\u4e0b\u6e38\u5bc6\u94a5\u7528\u4e8e\u670d\u52a1\u5668\u5230\u5ba2\u6237\u7aef\u901a\u4fe1\u7684\u52a0\u5bc6\u3002\u91cd\u8981\u7684\u662f\u8981\u6ce8\u610f\uff0c\u52a0\u5bc6\u662f\u6709\u72b6\u6001\u7684\uff0c\u4f7f\u7528\u7b2c\u4e00\u4e2a\u5bc6\u94a5\u6d41\u5b57\u8282\u6765\u52a0\u5bc6\u7b2c\u4e00\u4e2a\u6d88\u606f\uff0c\u540e\u7eed\u7684\u5bc6\u94a5\u6d41\u5b57\u8282\u7528\u4e8e\u52a0\u5bc6\u4e0b\u4e00\u4e2a\u6d88\u606f\u7b49\u3002\u8003\u8651\u5230\u4e0d\u53d8\u6027\u5f31\u70b9\u4ec5\u5728\u5bc6\u94a5\u6d41\u7684\u524d100\u4e2a\u5b57\u8282\u4e2d\u8868\u793a\uff0c\u5b83\u53ea\u80fd\u7528\u4e8e\u53d7\u4fdd\u62a4\u7684\u4e0a\u6e38\u6d41\u91cf\u7684\u524d100\u4e2a\u5b57\u8282\u548c\u53d7\u4fdd\u62a4\u4e0b\u6e38\u6d41\u91cf\u7684\u524d100\u4e2a\u5b57\u8282\u3002\u5047\u8bbe\u6bcf\u4e2a\u65b9\u5411\u4e0a\u7684\u7b2c\u4e00\u4e2a\u52a0\u5bc6\u6d88\u606f\u662fSSL\u63e1\u624b\u5b8c\u6210\u6d88\u606f\uff08SSL\u7684\u5178\u578b\u4f7f\u7528\u4e2d\u4e3a36\u5b57\u8282\uff09\uff0c\u5219\u5927\u7ea664\u5b57\u8282\u7684\u79d8\u5bc6\u660e\u6587\u6570\u636e\u5c06\u88ab\u4fdd\u7559\u3002\u4e0a\u6e38\u5bc6\u94a5\u6d41\u7684\u524d36\u4e2a\u5b57\u8282\u7528\u4e8e\u52a0\u5bc6Finished\u6d88\u606f\uff0c\u4e0b\u4e00\u4e2a\u5b57\u8282\u7528\u4e8e\u52a0\u5bc6\u5b9e\u9645\u5e94\u7528\u6570\u636e\u3002<\/p>\n

\u867d\u7136\u5bf9\u5728TLS\u4e2dRC4\u52a0\u5bc6\u65b9\u5f0f\u8fdb\u884c\u4e86\u5f88\u591a\u9ad8\u8c03\u7684\u653b\u51fb\uff0c\u4f46\u662f\u6839\u636eGarman\u7b49\u4eba\u57282015\u5e74\u7684\u7edf\u8ba1\u4e2d\uff0c\u53d1\u73b0RC4\u52a0\u5bc6\u8fd8\u662f\u5360\u4e86\u7ea630\u7684TLS\u6d41\u91cf\u6bd4\u4f8b[4]\u3002Garman\u7b49\u7814\u7a76\u4eba\u5458\u4e5f\u57282015\u5e743\u6708\u53d1\u5e03\u4ed6\u4eec\u5728TLS\u4e2d\u5bf9RC4\u7684\u653b\u51fb\u7ec6\u8282[4]\uff0c\u5176\u4e2d\u91cd\u70b9\u662f\u6062\u590d\u7528\u6237\u5bc6\u7801\u3002\u901a\u8fc7\u5e94\u7528\u8d1d\u53f6\u65af\u5206\u6790\u65b9\u6cd5\u5c06\u5bc6\u7801\u7684\u5148\u9a8c\u4fe1\u606f\u548c\u6536\u96c6\u7684\u5bc6\u6587\u7ed3\u5408\uff0c\u8f6c\u5316\u4e3a\u5bc6\u7801\u7684\u540e\u9a8c\u6982\u7387\u3002\u6839\u636e\u8bba\u6587\u4e2d\u7684\u7ed3\u679c\u663e\u793a\uff0c\u9488\u5bf9RC4\u7684\u653b\u51fb\u6548\u679c\u53ea\u4f1a\u8d8a\u505a\u8d8a\u597d\uff0c\u76ee\u524d\u80fd\u591f\u505a\u5230226<\/sup>\u6b21\u52a0\u5bc6\u7528\u6765\u6062\u590d\u7528\u6237\u5bc6\u7801\u5177\u6709\u5f88\u597d\u7684\u6210\u529f\u7387\uff0c\u6bd4\u4e4b\u524d234<\/sup>\u6b21\u7684\u6548\u679c\u597d\u5f88\u591a\u3002\u4f5c\u8005\u5206\u6790\u4e86\u4e0d\u540c\u53c2\u6570\u6761\u4ef6\u5bf9\u653b\u51fb\u6548\u679c\u7684\u5f71\u54cd\uff0c\u5982\u4f7f\u7528\u5148\u9a8c\u6982\u7387\u6784\u9020\u7684\u6210\u529f\u7387\u4f1a\u663e\u8457\u8f83\u9ad8\uff1b\u968f\u7740\u5bc6\u7801\u957f\u5ea6\u7684\u589e\u52a0\uff0c\u653b\u51fb\u7684\u6210\u529f\u7387\u663e\u8457\u4e0b\u964d\uff1b\u5141\u8bb8\u5927\u7684\u5bc6\u7801\u6d4b\u8bd5\u6570\u91cf\u503c\u80fd\u63d0\u9ad8\u653b\u51fb\u7684\u6210\u529f\u7387\uff1b\u800c\u4f7f\u7528Base64\u7f16\u7801\u65b9\u5f0f\uff0c\u4f1a\u589e\u52a0\u5bc6\u7801\u7684\u957f\u5ea6\uff0c\u4f46\u662f\u7531\u4e8e\u7f16\u7801\u4f1a\u5f15\u5165\u5197\u4f59\uff0c\u53c8\u4f1a\u6709\u5229\u4e8e\u653b\u51fb\uff0c\u6574\u4f53\u6548\u679c\u4e0a\u662f\u6709\u5229\u4e8e\u653b\u51fb\u3002<\/p>\n

Vanhoef\u00a0\u548c\u00a0Piessens[5] \u4e5f\u57282015\u5e747\u6708\u63d0\u51fa\u4e86\u8fdb\u4e00\u6b65\u7684\u6539\u8fdb\uff0c\u6253\u7834Wi-Fi\u4fdd\u62a4\u8bbf\u95ee\u65f6\u95f4\u5bc6\u94a5\u5b8c\u6574\u6027\u534f\u8bae\uff08WPA-TKIP\uff09\uff0c\u5e76\u9488\u5bf9TLS\u534f\u8bae\u8bbe\u8ba1\u5b9e\u7528\u7684\u660e\u6587\u6062\u590d\u653b\u51fb\u3002\u4f7f\u7528\u7edf\u8ba1\u5047\u8bbe\u68c0\u9a8c\u7684\u65b9\u6cd5\uff0c\u53d1\u73b0RC4\u5bc6\u94a5\u6d41\u4e2d\u65b0\u7684\u504f\u5dee\uff0c\u5e76\u63ed\u793a\u4e86\u521d\u59cb\u5bc6\u94a5\u6d41\u5b57\u8282\u4e2d\u7684\u8bb8\u591a\u65b0\u504f\u5dee\uff0c\u4ee5\u53ca\u51e0\u4e2a\u65b0\u7684\u957f\u671f\u504f\u5dee\u3002\u5229\u7528\u8fd9\u4e9b\u504f\u5dee\uff0c\u5c3d\u53ef\u80fd\u7684\u51cf\u5c11\u8fd4\u56de\u7684\u5019\u9009\u5217\u8868\u3002\u4f5c\u8005\u8fd8\u5f15\u5165\u4e86\u4e00\u79cd\u751f\u6210\u5927\u91cf\u76f8\u540c\u6570\u636e\u5305\u7684\u65b9\u6cd5\u6765\u6253\u7834WPA-TKIP\uff0c\u8fd9\u4e9b\u5206\u7ec4\u901a\u8fc7\u751f\u6210\u5176\u660e\u6587\u5019\u9009\u5217\u8868\u6765\u89e3\u5bc6\uff0c\u5e76\u4e14\u4f7f\u7528\u5197\u4f59\u5206\u7ec4\u7ed3\u6784\u6765\u4fee\u526a\u4e0d\u826f\u5019\u9009\u3002\u4ece\u89e3\u5bc6\u7684\u6570\u636e\u5305\u4e2d\u53ef\u4ee5\u5f97\u5230TKIP MIC\u5bc6\u94a5\uff0c\u80fd\u591f\u7528\u4e8e\u6ce8\u5165\u548c\u89e3\u5bc6\u6570\u636e\u5305\u3002\u4f5c\u8005\u901a\u8fc7\u5728\u53d7\u5bb3\u8005\u7684\u6d4f\u89c8\u5668\u4e2d\u8fd0\u884c\u6076\u610f\u7684Javascript \uff0c\u901a\u8fc7\u6536\u96c69*227<\/sup>\u4e2a\u5de6\u53f3\u7684HTTPS\u52a0\u5bc6\u540e\u7684\u8bf7\u6c42\uff0c\u80fd\u591f\u5c06\u653b\u51fb\u65f6\u95f4\u7f29\u77ed\u5230\u7ea652\u5c0f\u65f6\u3002\u5176\u4e2d\u6bcf\u4e2a\u8bf7\u6c42\u90fd\u662f\u5177\u6709\u76f8\u540c\u5bc6\u94a5\u52a0\u5bc6\u540e\u7684\u5bc6\u6587\uff0c\u4e3a\u4e86\u572875\u5c0f\u65f6\u5185\u5b8c\u6210\u653b\u51fb\uff0c\u5219\u9700\u8981\u5728\u6bcf\u79d2\u5185\u53d1\u51fa\u7ea64450\u4e2a\u8bf7\u6c42\u3002\u867d\u7136\u5bf9\u6bd4AlFardan\u8bbe\u8ba1\u7684\u653b\u51fb\u9700\u89812000\u5c0f\u65f6\u8981\u5c0f\u5f88\u591a\uff0c\u4f46\u662f\u5728\u8ddd\u79bb\u5b9e\u9645\u53ef\u7528\u4e8e\u73b0\u5b9e\u653b\u51fb\u8fd8\u5dee\u4e00\u70b9\u3002\u56e0\u4e3a\u5728\u77ed\u65f6\u95f4\u5185\u53d1\u9001\u5982\u6b64\u5927\u91cf\u7684\u8bf7\u6c42\u4f1a\u5f88\u5bb9\u6613\u88ab\u670d\u52a1\u5668\u68c0\u6d4b\u51fa\u6765\uff0c\u4f46\u662f\u8fd9\u4e2a\u5b9e\u9a8c\u7ed3\u679c\u786e\u5b9e\u5c06\u9488\u5bf9RC4\u7684\u653b\u51fb\u53c8\u5411\u5b9e\u9645\u53ef\u884c\u7684\u8fb9\u7f18\u63a8\u8fdb\u4e86\u4e00\u5927\u6b65\u3002<\/p>\n

\u603b\u7ed3<\/strong><\/h3>\n

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\u53c2\u8003\u6587\u732e\uff1a<\/strong><\/h3>\n

[ 1 ] S. R. Fluhrer, I. Mantin and A. Shamir. Weaknesses in the key scheduling algorithm of RC4. In Cryptography, 2001<\/p>\n

[ 2 ] N. AlFardan, R. Holloway and D. J. Bernstein. On the security of RC4 in TLS. In USENIX, Aug, 2013<\/p>\n

[ 3 ] I. Mantin and A. Shamir. A practical attack on broadcast RC4. In in Computer Science, 2001<\/p>\n

[ 4 ] C. Garman and K. G. Paterson. Attacks only get better: password recovery attacks against RC4 in TLS<\/p>\n

[ 5 ] M. Vanhoef and F. Piessens. All your biases belong to us: breaking RC4 in WPA-TKIP and TLS. In USENIX, Aug, 2015<\/p>\n

[ 6 ] I. Mantin. Bar-Minzva attack: breaking SSL with 13-year old RC4 weakness. In Blackhat, 2015<\/p>\n

[7] Y. Sheffer\uff0c R. Holz\u00a0and P. Saint-Andre. Recommendations for Secure Use of Transport Layer Security (TLS) and Datagram Transport Layer Security (DTLS). IETF RFC 7525. May 2015.<\/p>\n","protected":false},"excerpt":{"rendered":"

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