{"id":69,"date":"2023-08-15T13:53:07","date_gmt":"2023-08-15T13:53:07","guid":{"rendered":"http:\/\/mikuhacker.cn\/wp-blog\/?p=69"},"modified":"2025-01-17T09:40:11","modified_gmt":"2025-01-17T09:40:11","slug":"nepctf-2023-wp","status":"publish","type":"post","link":"http:\/\/mikuhacker.cn\/?p=69","title":{"rendered":"NepCTF 2023 WP"},"content":{"rendered":"\n<p class=\"has-very-dark-gray-color has-very-light-gray-background-color has-text-color has-background\">\u524d\u8a00\uff1a\u8fd9\u6b21\u6bd4\u8d5b\u53ea\u89e3\u51fa\u4e86\u4e24\u9053Misc\uff0cWeb\u65b9\u5411\u56e0\u4e3a\u7f3a\u4e4fjava\u76f8\u5173\u7684\u77e5\u8bc6\uff08\u505a\u7684\u9898\u592a\u5c11\u4e86\uff09\uff0c\u6ca1\u6709\u4e86\u89e3\u8fc7shiro\u53cd\u5e8f\u5217\u5316\u6f0f\u6d1e\u2014\u2014\u660e\u660e\u5e94\u8be5\u7b97\u662f\u57fa\u7840\u7684\u4e1c\u897f\uff0c\u4f46\u540e\u9762\u770b\u5e08\u5085\u4eec\u7684wp\u624d\u4e86\u89e3\uff0c\u8fd8\u662f\u592a\u83dc\u4e86\u2014\u2014\u5bfc\u81f4\u8fdeWeb\u7684\u7b7e\u5230\u9898\u90fd\u6ca1\u89e3\u51fa\uff0c\u6ca1\u62ff\u5230Web\u7b7e\u5230\u9898\u7684flag\u4e8e\u662f\u5176\u5b83\u7684Web\u9898\u8fde\u770b\u7684\u8d44\u683c\u90fd\u6ca1\u6709T^T\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">I. \u4e0eAI\u5171\u821e\u7684\u54c8\u592b\u66fc\uff08Misc\uff09<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/mikuhacker.cn\/wp-content\/uploads\/2023\/08\/\u4e0eAI\u5171\u821e\u7684\u54c8\u592b\u66fc-1.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"http:\/\/mikuhacker.cn\/wp-content\/uploads\/2023\/08\/\u4e0eAI\u5171\u821e\u7684\u54c8\u592b\u66fc-1.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" style=\"aspect-ratio:4.830508474576271;width:570px;height:auto\"\/><\/div><figcaption class=\"wp-element-caption\"><br><\/figcaption><\/figure>\n\n\n\n<p class=\"has-pale-pink-color has-text-color\">\u4e0b\u8f7d\u9644\u4ef6\u540e\u53ef\u4ee5\u770b\u5230\u6709\u4e00\u4e2acompressed.bin\u7684\u4e8c\u8fdb\u5236\u6587\u4ef6\uff0c\u9898\u76ee\u5e94\u8be5\u662f\u8981\u628a\u8fd9\u4e2a\u6587\u4ef6\u6309\u7279\u5b9a\u65b9\u5f0f\u89e3\u538b\u5f97\u5230flag,\u4e8e\u662f\u76f4\u63a5\u770bhuffman.py\u6587\u4ef6<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/mikuhacker.cn\/wp-content\/uploads\/2023\/08\/\u5c4f\u5e55\u622a\u56fe-2023-08-12-150458.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"http:\/\/mikuhacker.cn\/wp-content\/uploads\/2023\/08\/\u5c4f\u5e55\u622a\u56fe-2023-08-12-150458.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<p class=\"has-pale-pink-color has-text-color\">\u76f4\u63a5\u6765\u770b\u4e3b\u51fd\u6570\uff0ccompress\uff08\uff09\u51fd\u6570\u662f\u7528\u6765\u538b\u7f29input.txt\u6587\u4ef6\uff0cdecompress\uff08\uff09\u7528\u6765\u89e3\u538bcompressed.bin\u6587\u4ef6<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/mikuhacker.cn\/wp-content\/uploads\/2023\/08\/\u5c4f\u5e55\u622a\u56fe-2023-08-12-150513-1024x590.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"http:\/\/mikuhacker.cn\/wp-content\/uploads\/2023\/08\/\u5c4f\u5e55\u622a\u56fe-2023-08-12-150513-1024x590.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<p class=\"has-pale-pink-color has-text-color\">\u91cd\u65b0\u770b\u4e0b\u4ee3\u7801\uff0c\u53ef\u4ee5\u770b\u5230\u8fd9\u662f\u7528\u54c8\u592b\u66fc\u51fd\u6570\u6765\u5bf9\u6587\u4ef6\u8fdb\u884c\u89e3\u538b\u7f29\u64cd\u4f5c\uff0c\u4e0d\u8fc7\u6587\u4ef6\u91cc\u7f3a\u5c11\u5bf9decompress\uff08\uff09\u51fd\u6570\u7684\u5b9a\u4e49\uff0c\u6240\u4ee5\u8981\u8865\u5145\u4e00\u4e2adecompress\uff08\uff09\u51fd\u6570\u3002\u624b\u6413\u54c8\u592b\u66fc\u592a\u96be\u4e86\uff0c\u9898\u76ee\u90fd\u8bf4\u4e86\u8981\u548cAI\u5171\u821e\u4e86\uff0c\u6240\u4ee5\u76f4\u63a5\u62ff\u53bb\u7ed9ChatGpt\u6413\u4e00\u4e2adecompress\u51fd\u6570<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/mikuhacker.cn\/wp-content\/uploads\/2023\/08\/\u5c4f\u5e55\u622a\u56fe-2023-08-12-150537-1024x477.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"http:\/\/mikuhacker.cn\/wp-content\/uploads\/2023\/08\/\u5c4f\u5e55\u622a\u56fe-2023-08-12-150537-1024x477.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>def decompress(input_file, output_file):\n with open(input_file, 'rb') as f:\n     # Read frequency information\n     num_freq = int.from_bytes(f.read(1), byteorder='big')\n     frequencies = {}\n     for _ in range(num_freq):\n         byte = int.from_bytes(f.read(1), byteorder='big')\n         freq = int.from_bytes(f.read(4), byteorder='big')\n         frequencies&#91;byte] = freq\n    # Build Huffman tree\n    root = build_huffman_tree(frequencies)\n\n    # Read compressed data\n    compressed_data = \"\"\n    while True:\n        byte = f.read(1)\n        if len(byte) == 0:\n            break\n        compressed_data += \"{0:08b}\".format(int.from_bytes(byte, byteorder='big'))\n\n    # Remove padding\n    padding = int(compressed_data&#91;-8:], 2)\n    compressed_data = compressed_data&#91;:-8-padding]\n\n# Decode compressed data\ncurrent_node = root\ndecompressed_data = \"\"\nfor bit in compressed_data:\n    if bit == '0':\n        current_node = current_node.left\n    else:\n        current_node = current_node.right\n\n    if current_node.char is not None:\n        decompressed_data += chr(current_node.char)\n        current_node = root\n\nwith open(output_file, 'w') as f:\n    f.write(decompressed_data)<\/code><\/pre>\n\n\n\n<p><br><\/p>\n\n\n\n<p class=\"has-pale-pink-color has-text-color\">\u628a\u51fd\u6570\u8865\u8fdbhuffman.py\u540e\u5728huffman.py\u6240\u5728\u6587\u4ef6\u5939\u5185\u521b\u5efainput.txt\u548cdecompressed.txt\u6587\u4ef6\uff0c\u7136\u540e\u8fd0\u884chuffman.py\u6587\u4ef6\u5373\u53ef\u5728decompressed.txt\u4e2d\u770b\u5230flag<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/mikuhacker.cn\/wp-content\/uploads\/2023\/08\/\u5c4f\u5e55\u622a\u56fe-2023-08-12-150629.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"http:\/\/mikuhacker.cn\/wp-content\/uploads\/2023\/08\/\u5c4f\u5e55\u622a\u56fe-2023-08-12-150629.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">II. Code\uff08Misc\uff09<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/mikuhacker.cn\/wp-content\/uploads\/2023\/08\/\u5c4f\u5e55\u622a\u56fe-2023-08-12-170119-1024x576.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"http:\/\/mikuhacker.cn\/wp-content\/uploads\/2023\/08\/\u5c4f\u5e55\u622a\u56fe-2023-08-12-170119-1024x576.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<p class=\"has-pale-pink-color has-text-color\">\u4e00\u4e2a\u5199c\u8bed\u8a00\u7684\u5e73\u53f0\uff0c\u9898\u76ee\u63d0\u793a\u5b58\u5728\u73af\u5883\u53d8\u91cf\uff0c\u6240\u4ee5flag\u5e94\u8be5\u662f\u85cf\u5728\u73af\u5883\u53d8\u91cf\u4e2d\uff0c\u53ea\u8981\u628a\u73af\u5883\u53d8\u91cf\u5168\u90e8\u6253\u5370\u51fa\u6765\u5c31\u597d\u4e86<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/mikuhacker.cn\/wp-content\/uploads\/2023\/08\/\u5c4f\u5e55\u622a\u56fe-2023-08-12-173334-1024x576.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"http:\/\/mikuhacker.cn\/wp-content\/uploads\/2023\/08\/\u5c4f\u5e55\u622a\u56fe-2023-08-12-173334-1024x576.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<p class=\"has-pale-pink-color has-text-color\">\u5c1d\u8bd5\u6253\u5370\u73af\u5883\u53d8\u91cf\uff0c\u7ed3\u679c\u53d1\u73b0\u88abban\u4e86\u3002\u5b9e\u9645\u4e0a\u88abban\u7684\u53ea\u662fsystem\u548cenv\u5b57\u7b26\uff0c\u53ea\u8981\u628aenv\u6539\u6210en\u6216\u5176\u5b83\u540d\u5b57\u5c31\u53ef\u4ee5\u7ed5\u8fc7\u4e86\uff0c\u4e0d\u8fc7\u770b\u522b\u4eba\u7684wp\u53d1\u73b0\u8fd8\u53ef\u4ee5\u5728\u5b57\u7b26\u4e2d\u95f4\u52a0\u4e2a\u53cd\u659c\u6760\u7136\u540e\u6362\u4e00\u4e0b\u884c\u6765\u8fdb\u884c\u7ed5\u8fc7\uff08\u5947\u602a\u7684\u7ed5\u8fc7\u59ff\u52bf\u589e\u52a0\u4e86\uff09\u3002\u7f16\u8bd1\u540e\u5373\u53ef\u6253\u5370\u51faflag<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include&lt;stdlib.h&gt;\nextern char**en;\nint main()\n{\nchar**var;\nfor(var=en;*var!=NULL;++var)\nprintf(\"%s \\n\",*var);\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u70b9\u611f\u60f3<\/h2>\n\n\n\n<p class=\"has-very-dark-gray-color has-very-light-gray-background-color has-text-color 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