{"id":122973,"date":"2026-11-06T03:58:06","date_gmt":"2026-11-05T19:58:06","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/122973.html"},"modified":"2026-11-06T03:58:06","modified_gmt":"2026-11-05T19:58:06","slug":"misc%e5%85%a5%e9%97%a8day3%ef%bc%9apng-%e7%9a%84%e5%9b%9b%e7%a7%8d%e6%ad%bb%e6%b3%95%ef%bc%8c%e4%bb%a5%e5%8f%8a%e6%80%8e%e4%b9%88%e4%b8%80%e7%9c%bc%e7%9c%8b%e5%87%ba%e5%ae%83","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/122973.html","title":{"rendered":"Misc\u5165\u95e8Day3\uff1aPNG \u7684\u56db\u79cd\u201c\u6b7b\u6cd5\u201c\uff0c\u4ee5\u53ca\u600e\u4e48\u4e00\u773c\u770b\u51fa\u5b83\u88ab\u6539\u8fc7"},"content":{"rendered":"

\/* MD \/ \u5bcc\u6587\u672c\u4e2d\u7684 .toc\uff08\u542b\u535a\u5ba2\u56ed\u642c\u5bb6\u7b49\u5d4c\u5957\u7ed3\u6784\uff09\uff1b.toc-box \u5728\u4fa7\u680f\uff0c\u4e0d\u53d7\u5f71\u54cd *\/
\n #content_views .toc,
\n \/* \u7f16\u8f91\u5668\u5e38\u5728\u76ee\u5f55\u524d\u540e\u63d2\u5165\u7a7a p\uff08:empty \u4ecd\u5360 20px\uff09\uff0c\u4e00\u5e76\u53bb\u6389\u907f\u514d\u9876\u7a7a\u9699 *\/
\n #content_views.markdown_views > p:empty:has(+ .toc),
\n #content_views.markdown_views > .toc + p:empty,
\n \/* \u5bcc\u6587\u672c\u65e7\u7248\u76ee\u5f55\u6807\u8bb0 *\/
\n #content_views.htmledit_views #main-toc,
\n #content_views.htmledit_views #hr-toc,
\n #content_views.htmledit_views p[id*=\\”-toc\\”] {
\n display: none !important;
\n }
\n \/* \u76ee\u5f55\u53bb\u6389\u540e\uff0c\u7d27\u8ddf\u7684\u9996\u4e2a\u6807\u9898\u4e0d\u518d\u591a\u51fa\u4e00\u5757\u4e0a\u8fb9\u8ddd *\/
\n #content_views.markdown_views > .toc + h1,
\n #content_views.markdown_views > .toc + h2,
\n #content_views.markdown_views > .toc + h3,
\n #content_views.markdown_views > .toc + h4,
\n #content_views.markdown_views > .toc + p:empty + h1,
\n #content_views.markdown_views > .toc + p:empty + h2,
\n #content_views.markdown_views > .toc + p:empty + h3,
\n #content_views.markdown_views > .toc + p:empty + h4 {
\n margin-top: 0 !important;
\n }<\/p>\n

\u00a0\u56fe\u7247\u9898 90% \u7684\u4fe1\u606f\u5728\u6587\u4ef6\u5934\u548c\u5757\u7ed3\u6784\u91cc，\u4e0d\u5728\u56fe\u91cc\u3002\u6240\u4ee5\u4eca\u5929\u7684\u76ee\u6807\u5c31\u662f：<\/p>\n

1.\u770b\u61c2PNG\u7684\u7ed3\u6784，<\/p>\n

2.\u8ba4\u5f97\u56db\u79cd\u88ab\u52a8\u8fc7\u7684\u73b0\u8c61，<\/p>\n

3.\u4f1a\u4fee\u88ab\u6539\u9ad8\u5ea6\u7684\u56fe\u3002<\/p>\n

\u4eca\u5929\u6d89\u53ca\u7684\u6240\u6709\u7684\u8bc6\u56fe\u5de5\u5177\u5747\u7531AI\u751f\u6210\u5982\u4e0b\u56fe，\u4eca\u5929\u6ca1\u6709\u6d89\u53ca\u5230\u5de5\u5177\u6216\u8005\u73af\u5883\u7684\u4e0b\u8f7d\u6216\u5b89\u88c5：<\/p>\n

\"\"\u4e00.PNG\u9aa8\u67b6<\/p>\n

1.1PNG\u4e0d\u662f\u4e00\u6574\u5757\u6570\u636e，\u800c\u662f\u4e00\u4e32\u62fc\u63a5\u8d77\u6765\u7684\u201c\u5757\u201d，\u6bcf\u5757\u7684\u6784\u9020\u4e00\u6a21\u4e00\u6837：<\/p>\n

\u7c7b\u4f3c\u4e8e：\u30104\u5b57\u8282\u957f\u5ea6\u3011\u30104\u5b57\u8282\u957f\u5ea6\u3011\u3010N\u5b57\u8282\u6570\u636e\u3011\u30104\u5b57\u8282CRC\u3011\u3002<\/p>\n

\u70b9\u51fbMisc.bat，\u7136\u540e\u8f93\u51653，enter,\u8fdb\u5165\u8bfb\u53d6\u56fe\u7247PNG\u7684\u754c\u9762，\u5982\u4e0b\u56fe：<\/p>\n

\"\"<\/p>\n

\u7136\u540e\u5c06\u7cfb\u7edf\u751f\u6210\u7684\u6b63\u5e38\u56fe\u7247\u590d\u5236\u8fdb\u521a\u624d\u7684\u56fe\u7247\u8bfb\u53d6\u754c\u9762，\u6b63\u5e38\u56fe\u7247\u8bfb\u53d6\u7684\u7ed3\u679c\u5982\u4e0b\u56fe：<\/p>\n

\"\"<\/p>\n

\u7531\u4e0a\u56fe\u53ef\u4ee5\u89c2\u5bdf\u5230\u6b63\u5e38\u56fe\u7247\u7684\u5404\u79cd\u4fe1\u606f，PNG\u56db\u4e2a\u5757\u7684\u5206\u5de5\u5206\u522b\u662f：1.IHDR，\u56fe\u50cf\u5934，\u56fa\u5b9a13\u5b57\u8282（13\u7ec416 \u8fdb\u5236\u5b57\u7b26），\u524d8\u5b57\u8282\u662f\u5bbd\u548c\u9ad8，\u6539\u9ad8\u5ea6\u662fCTF\u4e2d\u5e38\u89c1\u7684\u95ee\u9898；2.IDAT\u771f\u6b63\u7684\u50cf\u7d20\u6570\u636e，zlib（zlib \u662f\u4e00\u5957\u514d\u8d39\u3001\u5f00\u6e90\u3001\u65e0\u635f\u538b\u7f29\u5e93）\u538b\u7f29\u8fc7；3.tXEt，\u6587\u672c\u4fe1\u606f，\u7528\u6765\u5199\u4f5c\u8005，\u6ce8\u91ca；4.IEND\u7ed3\u675f\u6807\u5fd7，\u5fc5\u987b\u662f\u6587\u4ef6\u7684\u6700\u540e\u4e00\u4e2a\u5757\u3002<\/p>\n

1.2\u4e3a\u4ec0\u4e48CRC\u662f\u5173\u952e？<\/p>\n

\u56e0\u4e3a\u5f53\u6587\u4ef6\u91cc\u7684CRC==\u91cd\u7b97\u7684CRC\u2014\u2014\u7cfb\u7edf\u62a5OK；<\/p>\n

\u4f46\u5f53\u6709\u4eba\u6539\u4e86\u5757\u5185\u5bb9\u4f46\u6ca1\u6539CRC\u2014\u2014\u7cfb\u7edf\u62a5BAD；<\/p>\n

\u6240\u4ee5\u5b89\u88c5\u4e4b\u524d\u8bbe\u8ba1\u597d\u7684\u8ba1\u5212，\u4eca\u5929\u4e0d\u7528\u5b66\u4f1a\u7b97CRC，\u53ea\u8981\u4f1a\u770b，\u6216\u8005\u5fc3\u91cc\u77e5\u9053：\u53ea\u8981CRC\u62a5BAD，iu\u7acb\u523b\u77e5\u9053\u8fd9\u4e2a\u5757\u88ab\u52a8\u8fc7\u3002<\/p>\n

\u4e8c.\u56db\u79cd\u201c\u6b7b\u6cd5\u201d<\/p>\n

\u4ee5\u4e0b\u6240\u6709\u6d89\u53ca\u5230\u7684\u4f8b\u5b50\u56fe\u7247\u5747\u7531AI\u751f\u6210<\/p>\n

\"\"<\/p>\n

2.1:flag\u76f4\u63a5\u8eba\u5728tEXt\u91cc<\/p>\n

\u8fd9\u5c5e\u4e8e\u660e\u6587\u6587\u672c\u7c7b，\u662f\u6700\u76f4\u63a5，\u6700\u7b80\u5355\u7684\u4e00\u79cd，\u9009\u62e9\u8fd9\u4e2aNormal\u7684\u56fe\u7247，\u901a\u8fc7\u8bfb\u53d6\u56fe\u7247\u7684tEXt\u5185\u5bb9，\u76f4\u63a5\u53ef\u4ee5\u627e\u5230\u660e\u786e\u7684Flag，\u5982\u4e0b\u56fe：<\/p>\n

\"\"<\/p>\n

\u770b\u4e0a\u9762\u56fe\u7247\u91cc\u8bfb\u53d6\u51fa\u6765\u7684\u4fe1\u606f，\u6709\u6548\u4fe1\u606f\u5c31\u662f： flag{this_is_in_a_tEXt_chunk}\u3002<\/p>\n

2.2：\u9ad8\u5ea6\u88ab\u6539（\u6700\u7ecf\u5178）<\/p>\n

\u770b\u5230\u8fd9\u4e2atampered_height.png\u56fe\u7247，\u5b83\u662f\u6709\u4e00\u90e8\u5206\u7f3a\u5931\u7684，\u6211\u4eec\u5c1d\u8bd5\u8bfb\u53d6\u5b83\u7684\u5173\u952e\u4fe1\u606f，\u5982\u4e0b\u56fe:<\/p>\n

\"\"<\/p>\n

\u6211\u4eec\u89c2\u5bdf\u5230CRC\u62a5\u4e86BAD，\u6240\u4ee5\u6211\u4eec\u5224\u65ad\u51fa\u6765\u8fd9\u4e2a\u56fe\u7247\u88ab\u6539\u8fc7，\u518d\u770b\u662fIHDR\u51fa\u73b0\u4e86\u9519\u8bef，\u6240\u4ee5\u56fe\u7247\u88ab\u52a8\u7684\u662f\u5934\u90e8，\u800c\u4e0d\u662f\u50cf\u7d20，\u56fe\u7247\u80fd\u6253\u5f00，\u4f46\u660e\u663e\u7531\u7f3a\u9677\u7684，\u8fd9\u5c31\u662f\u9898\u76ee\u7279\u5f81，\u7136\u540e\u5229\u7528\u5de5\u5177\u6539\u6b63\u786e\u7684\u9ad8\u5ea6，（\u4eca\u5929\u7684\u8ba1\u5212\u91cc\u4e0d\u8981\u6c42\u624b\u6539\u9ad8\u5ea6，\u800c\u662f\u7528\u5de5\u5177），\u6240\u4ee5\u6211\u4eec\u4f7f\u7528\u5de5\u5177\u4fee\u6539\u56fe\u7247，\u751f\u6210\u7b2c\u4e94\u5f20\u56fe\u7247\u3002\u518d\u6b21\u6253\u5f00，\u8bfb\u53d6\u4fe1\u606f，\u53d1\u73b0\u5982\u4e0b\u56fe：<\/p>\n

\"\"<\/p>\n

\u6211\u4eec\u770b\u5230\u56fe\u7247\u5b8c\u6574\u51fa\u73b0，CRC\u4e5f\u6ca1\u62a5BAD，\u800c\u662fOK，\u8bf4\u660e\u6539\u597d\u4e86\u3002<\/p>\n

2.3：IEND\u540e\u9762\u85cf\u4e1c\u897f<\/p>\n

\u6211\u4eec\u5148\u8bf4\u7ed3\u8bba：IEND\u7ed3\u675f\u4f4d\u7f6e==\u6587\u4ef6\u5927\u5c0f\u8bc1\u660e\u6587\u4ef6\u5c31\u662f\u5e72\u51c0\u7684，\u5426\u5219\u5c31\u8bf4\u660e\u540e\u9762\u6709\u8d27<\/span>\u3002<\/p>\n

\u6211\u4eec\u770bpng_with_zip.png\u8fd9\u4e2a\u7167\u7247，\u6709\u4ee5\u4e0b\u4fe1\u606f<\/p>\n

\"\"<\/p>\n

\u63a5\u4e0b\u6765\u5206\u6790：<\/p>\n

\u9996\u5148PNG\u7684\u7b7e\u540d\u56fa\u5b9a\u662f8\u5b57\u8282，\u7136\u540e\u6211\u4eec\u770b\u5230\u8fd9\u91cc\u7684IHDR\u957f\u5ea6\u662f13，\u90a3\u6211\u4eec\u5c31\u53ef\u4ee5\u7b97\u51faIHDR\u5360\u51e0\u4e2a\u5b57\u8282：4+4+13+4=25\u7531\u6b64\u7c7b\u63a8，IDAT\u53604+4+261+4=306\u5b57\u8282，IEND\u957f\u5ea6\u662f0，\u6211\u4eec\u5c31\u7b97\u5b83\u53604+4+0+4=12\u5b57\u8282，\u7136\u540e\u7b97\u51fa\u6574\u4f53\u53608+25+306+12=351\u5b57\u8282，\u7136\u540e\u6839\u636e\u56fe\u7247\u4fe1\u606f，\u8be5\u56fe\u7247\u7684\u957f\u5ea6\u662f492\u5b57\u8282，\u5bf9\u6bd4\u53d1\u73b0\u8be5\u56fe\u7247\u957f\u5ea6\u548c352\u7684IEND\u4e0d\u76f8\u7b49，\u6240\u4ee5\u5224\u65ad\u6709\u79c1\u8d27\u3002492-352=141\u5b57\u8282，\u6240\u4ee5\u8fd9\u5c31\u662fIEND\u540e\u9762\u85cf\u4e1c\u897f\u3002<\/p>\n

2.4：\u6587\u4ef6\u5934\u88ab\u6539<\/p>\n

\u524d\u63d0\u6761\u4ef6，\u56fe\u7247\u60f3\u8981\u6b63\u5e38\u6253\u5f00，\u6587\u4ef6\u5934\u5fc5\u987b\u662f\u56fa\u5b9a\u7684：89 50 4E 47 0D 0A 1A 0A<\/span>，\u8fd9\u6587\u4ef6\u5934\u5fc5\u987b\u662f\u56fa\u5b9a\u7684，\u4e00\u4e2a\u5b57\u90fd\u4e0d\u80fd\u6539\u3002\u63a5\u4e0b\u6765，\u6211\u4eec\u770b\u7b2c\u4e00\u5f20\u56fe\u7247，\u5982\u4e0b\u56fe：<\/p>\n

\"\"<\/p>\n

\u6211\u4eec\u5c1d\u8bd5\u5206\u6790\u6587\u4ef6\u7684\u4fe1\u606f，\u6309\u7167\u5e38\u89c4\u6b65\u9aa4\u64cd\u4f5c，\u5f97\u51fa\u4ee5\u4e0b\u7ed3\u679c：<\/p>\n

\"\"<\/p>\n

\u6211\u4eec\u770b\u5230\u4e0a\u9762\u663e\u793a\u7684PNG\u7b7e\u540d\u4e0d\u6b63\u786e，\u518d\u4ed4\u7ec6\u89c2\u5bdf，\u53d1\u73b0\u8be5\u6587\u4ef6\u4e2d\u7684\u7b7e\u540d\u662f 89 50 4E 47 0D 0A 1A 00，\u6700\u540e\u7684\u5b57\u7b2600\u548c\u6211\u4eec\u4e0a\u9762\u6240\u89c4\u5b9a\u7684\u56fa\u5b9a\u7b7e\u540d0A\u4e0d\u4e00\u6837，\u6240\u4ee5\u7531\u6b64\u5224\u65ad，PNG\u7b7e\u540d\u4e0d\u6b63\u786e\u5c31\u662f\u6587\u4ef6\u56fe\u7247\u6253\u4e0d\u5f00\u7684\u539f\u56e0\u3002<\/p>\n

\u4ee5\u4e0a\u5c31\u662f\u5e38\u89c1\u7684\u56db\u79cd\u6b7b\u6cd5\u3002<\/p>\n

\u4e09.CRC BAD \u5728 IHDR \u548c IDAT，\u662f\u4e24\u4ef6\u4e8b<\/p>\n

IHDR\u91cc\u88c5\u7684\u662f13\u5b57\u8282\u53c2\u6570，\u5305\u62ec\u5bbd\u9ad8，\u4f4d\u6df1\u7b49，IDAT\u91cc\u88c5\u7684\u662f\u538b\u7f29\u8fc7\u7684\u50cf\u7d20\u53c2\u6570\u3002IHDR\u62a5\u9519\u662f\u8bfb\u6cd5\u9519\u4e86，\u6253\u4e0d\u5f00\u6216\u8005\u989c\u8272\u4e71；IDAT\u62a5\u9519\u662f\u753b\u9762\u5c40\u90e8\u82b1\u6389，\u6216\u8005\u5b8c\u5168\u770b\u4e0d\u51fa\u5f02\u5e38\u3002<\/p>\n

IHDR\u62a5\u9519\u53ef\u4ee5\u4fee\u590d，IDAT\u62a5\u9519\u4e00\u822c\u4e0d\u80fd\u4fee\u590d\u3002<\/span><\/p>\n

\u56db.\u56fe\u7247\u9898\u6392\u67e5\u6b65\u9aa4<\/p>\n

  • file\/\u770bPNG\u59348\u5b57\u8282\u662f\u4e0d\u662f89 50 4E 47 0D 0A 1A 0A<\/span>；<\/li>\n
  • Strings\/findstr\u626b\u660e\u6587，\u770b\u6709\u6ca1\u6709Flag；<\/li>\n
  • \u770bCRC\u662f\u5426\u62a5BAD，\u4e14\u770b\u5728\u54ea\u51fa\u73b0\u7684BAD；<\/li>\n
  • \u770bIEND\u4e4b\u540e\u6709\u6ca1\u6709\u6b8b\u7559，\u5c31\u662f\u89e3\u9898\u5173\u952e\u3002<\/li>\n

    \u4ee5\u4e0a\u5c31\u662f\u4eca\u5929\u535a\u5ba2\u7684\u5185\u5bb9，\u4eca\u5929\u4e3b\u8981\u5c31\u662f\u5b66\u5230\u4e86\u4e09\u70b9：<\/p>\n

  • \u56fe\u7247\u9898\u7684\u7ebf\u7d22\u5728\u7ed3\u6784\u548c\u5b57\u8282\u91cc，\u4e0d\u5728\u50cf\u7d20\u91cc；<\/span><\/li>\n
  • CRD BAD\u8bf4\u660e\u5757\u88ab\u6539\u8fc7，BAD\u5728IHDR\u8981\u4fee，BAD\u5728IDAT\u8981\u62c6；<\/span><\/li>\n
  • IEND\u7ed3\u675f\u4f4d\u7f6e<\u6587\u4ef6\u5927\u5c0f\u2014\u2014\u5c3e\u90e8\u6709\u95ee\u9898\u3002<\/span><\/li>\n","protected":false},"excerpt":{"rendered":"

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