{"id":244886,"date":"2022-02-09T04:54:05","date_gmt":"2022-02-08T20:54:05","guid":{"rendered":"https:\/\/www.idc.net\/help\/244886\/"},"modified":"2022-02-09T04:54:05","modified_gmt":"2022-02-08T20:54:05","slug":"%e5%8c%ba%e5%9d%97%e9%93%be%e5%89%8d%e7%bd%ae%e7%9f%a5%e8%af%86%e4%b9%8bhash-%ef%bc%88%e4%b8%80%ef%bc%89","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/244886\/","title":{"rendered":"\u533a\u5757\u94fe\u524d\u7f6e\u77e5\u8bc6\u4e4bHash \uff08\u4e00\uff09"},"content":{"rendered":"

\n

\u5b9a\u4e49<\/h4>\n

hash \u662f\u4e00\u79cd\u628a\u4efb\u610f\u957f\u5ea6\u8f93\u5165\u53d8\u6362\u6210\u56fa\u5b9a\u957f\u5ea6\u8f93\u51fa\u7684\u4e00\u79cd\u7b97\u6cd5\u3002<\/p>\n

\u5047\u8bbe\u6211\u4eec\u5df2\u7ecf\u5b9a\u4e49\u4e86\u4e00\u4e2a hash \u51fd\u6570\u540d\u4e3a H\uff0c\u8f93\u5165\u5185\u5bb9\u4e3a message\uff0c\u8f93\u51fa\u5185\u5bb9\u4e3a x\uff0c\u90a3\u4e48\u5c31\u6709\u5982\u4e0b\u516c\u5f0f\u3002<\/p>\n

H(message) = x<\/pre>\n
\u8fd9\u662f\u4e00\u4e2a\u538b\u7f29\u7684\u8fc7\u7a0b\uff0c\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u4f1a\u628a\u8f93\u51fa\u503c\u79f0\u4e4b\u4e3a hash \u503c\u3002<\/p>\n
\u63a5\u4e0b\u6765\u901a\u8fc7\u4e00\u4e2a\u5177\u4f53\u7684\u6848\u4f8b\u6765\u4e86\u89e3 hash \u7684\u8fc7\u7a0b\u3002<\/p>\n
\u6211\u4eec\u5b9a\u4e49\u8fd9\u6837\u4e00\u4e2a\u573a\u666f\uff0c\u7ea6\u5b9a\u4efb\u610f\u6b63\u6574\u6570\uff0c\u8981\u5b58\u653e\u5728\u957f\u5ea6\u4e3a 6 \u7684\u6570\u7ec4\u4e2d\uff0c\u90a3\u4e48\u6b64\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u5229\u7528 hash \u7684\u601d\u60f3\u8bbe\u8ba1\u4ec0\u4e48\u6837\u7684\u65b9\u6848\u6765\u505a\u5230\u8fd9\u4e2a\u4e8b\u60c5\u5462\uff1f<\/p>\n
\u6570\u7ec4\u7684\u5177\u4f53\u4f4d\u7f6e\u6211\u4eec\u53ef\u4ee5\u7528\u4e0b\u6807\u6765\u8868\u793a 0, 1, 2, 3, 4, 5\u3002\u60f3\u8981\u5c06\u4efb\u610f\u6b63\u6574\u6570\u653e\u5165\u5230\u6570\u7ec4\u4e2d\uff0c\u90a3\u4e48\u6211\u4eec\u53ea\u9700\u8981\u8bbe\u8ba1\u4e00\u4e2a\u51fd\u6570\uff0c\u8f93\u5165\u503c\u4e3a\u4efb\u610f\u6b63\u6574\u6570\uff0c\u8f93\u51fa\u503c\u4e3a\u8be5\u6570\u7ec4\u4e0b\u6807\u4e2d\u7684\u4efb\u610f\u4e00\u4e2a\u5373\u53ef\uff0c\u5f97\u5230\u4e86\u8f93\u51fa\u503c\uff0c\u6211\u4eec\u5c31\u76f8\u5f53\u4e8e\u77e5\u9053\u5e94\u8be5\u628a\u8f93\u5165\u503c\u653e\u5230\u6570\u7ec4\u4e2d\u7684\u67d0\u4e2a\u4f4d\u7f6e\u4e86\u3002<\/p>\n
\n
\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u6c42\u4f59\u6cd5\u6765\u5b9a\u4e49\u8fd9\u4e2a hash \u51fd\u6570\u3002<\/p>\n
function<\/span> suplus<\/span>(number<\/span>) {
  return<\/span> number<\/span> %<\/span> 6<\/span>
}<\/pre>\n
\u4e8e\u662f\uff0c\u968f\u4fbf\u53d6\u51e0\u4e2a\u6570\uff0c\u5f97\u5230 hash \u503c\u4e4b\u540e\u5c31\u80fd\u5b58\u5165\u6570\u7ec4\u5bf9\u5e94\u7684\u4f4d\u7f6e\u3002<\/p>\n
\/\/ \u8f93\u5165\u503c\uff1a61<\/span>
suplus<\/span>(61<\/span>) =<\/span> 1<\/span><\/pre>\n
\n
\/\/ \u8f93\u5165\u503c\uff1a101
suplus(101) = 5<\/pre>\n
\n
\u6b64\u65f6\u7684\u54c8\u5e0c\u503c\u8868\u793a\u7684\u662f\u6570\u7ec4\u7684\u4e0b\u6807\uff0c\u56e0\u6b64\u5728\u5f88\u591a\u5e94\u7528\u573a\u666f\uff0c\u8f93\u51fa\u7ed3\u679c\u54c8\u5e0c\u503c\u4e5f\u88ab\u79f0\u4e3a\u54c8\u5e0c\u5730\u5740\u3002<\/p>\n
\u54c8\u5e0c\u78b0\u649e<\/h4>\n
\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u8f93\u5165\u503c\u7684\u8303\u56f4\u4e00\u5b9a\u5927\u4e8e\u8f93\u51fa\u503c\u7684\u8303\u56f4\uff0c\u8fd9\u662f hash \u7684\u91cd\u8981\u7279\u6027\u4e4b\u4e00\u3002\u56e0\u6b64\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u4e0d\u540c\u7684\u8f93\u5165\u4f1a\u5f97\u5230\u76f8\u540c\u7684\u8f93\u51fa\u7ed3\u679c\u3002<\/p>\n
\/\/ \u4e0d\u540c\u7684\u8f93\u5165\uff0c\u5f97\u5230\u4e86\u76f8\u540c\u7684\u8f93\u51fa\uff0c\u54c8\u5e0c\u5730\u5740\u76f8\u540c<\/span>
suplus<\/span>(7<\/span>)  =<\/span> 1<\/span>
suplus<\/span>(61<\/span>) =<\/span> 1<\/span><\/pre>\n
\u6b64\u65f6\u54c8\u5e0c\u5730\u5740\u76f8\u540c\uff0c\u6309\u7167\u89c4\u5219\uff0c\u6211\u4eec\u4e0d\u5f97\u4e0d\u628a\u4e0d\u540c\u7684\u503c\uff0c\u5b58\u5165\u76f8\u540c\u7684\u4f4d\u7f6e\uff0c\u8fd9\u79cd\u60c5\u51b5\u5c31\u88ab\u79f0\u4e4b\u4e3a\u54c8\u5e0c\u78b0\u649e\uff08collision\uff09\u3002<\/p>\n
\u89e3\u51b3\u54c8\u5e0c\u78b0\u649e\u7684\u65b9\u6cd5\u5f88\u591a\uff0c\u8fd9\u91cc\u4ecb\u7ecd\u4e00\u4e2a\u6bd4\u8f83\u5e38\u89c1\u7684\u65b9\u6cd5\uff1a\u4ee5\u6570\u7ec4\u7684\u6bcf\u4e2a\u5730\u5740\u4e3a\u6839\u8282\u70b9\uff0c\u6784\u5efa\u4e00\u4e2a\u65b0\u7684\u94fe\u8868\u3002<\/p>\n
\u4f8b\u5982\u5f53\u8f93\u5165\u6570\u5b57\u5206\u522b\u4e3a 7, 61 \u65f6\u3002<\/p>\n
\n
\u4f46\u662f\u5f53\u6570\u636e\u91cf\u5e9e\u5927\u65f6\uff0c\u94fe\u8868\u7684\u67e5\u8be2\u901f\u5ea6\u6bd4\u8f83\u4f4e\u6548\uff0c\u56e0\u6b64\u6211\u4eec\u5728\u5b9e\u8df5\u4e2d\uff0c\u4f1a\u5c06\u94fe\u8868\u66ff\u6362\u6210\u7ea2\u9ed1\u6811\u7b49\u64cd\u4f5c\u6548\u7387\u66f4\u9ad8\u7684\u6570\u636e\u7ed3\u6784\u3002<\/p>\n
\u5f53\u7136\uff0c\u6700\u7406\u60f3\u7684\u60c5\u51b5\u662f\u8f93\u51fa\u8303\u56f4\u8db3\u591f\u5e7f\uff0c\u4e0d\u51fa\u73b0 hash \u78b0\u649e\u3002\u56e0\u6b64\u6211\u4eec\u5b9e\u8df5\u4e2d\u4f7f\u7528\u7684 hash \u51fd\u6570\uff0c\u8f93\u51fa\u503c\u7684\u8303\u56f4\u90fd\u975e\u5e38\u5e9e\u5927\uff0c\u4f8b\u5982\u65e9\u671f\u7528\u5f97\u6bd4\u8f83\u591a\u7684 md5\uff0c\u73b0\u5728\u4f7f\u7528\u6bd4\u8f83\u591a\u7684sha256\uff1a\u6bd4\u7279\u5e01\u4e2d\u4f7f\u7528\u7684\u54c8\u5e0c\u7b97\u6cd5\u3002\u4f46\u662f\u7531\u4e8e\u8f93\u5165\u503c\u8303\u56f4\u4e00\u5b9a\u5927\u8f93\u51fa\u503c\u8303\u56f4\uff0c\u56e0\u6b64\u7406\u8bba\u4e0a\u54c8\u5e0c\u78b0\u649e\u4e00\u5b9a\u4f1a\u5b58\u5728\u3002<\/p>\n
\n
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\u672c\u6587\u8f6c\u8f7d\u81ea\u5fae\u4fe1\u516c\u4f17\u53f7\u300c\u8fd9\u6ce2\u80fd\u53cd\u6740\u300d\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u4e8c\u7ef4\u7801\u5173\u6ce8\u3002\u8f6c\u8f7d\u672c\u6587\u8bf7\u8054\u7cfb\u8fd9\u6ce2\u80fd\u53cd\u6740\u516c\u4f17\u53f7\u3002<\/p>\n
\n","protected":false},"excerpt":{"rendered":"
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