{"id":350,"date":"2025-11-10T16:07:43","date_gmt":"2025-11-10T08:07:43","guid":{"rendered":"https:\/\/www.sanjiuctf.com\/?p=350"},"modified":"2025-11-10T16:07:44","modified_gmt":"2025-11-10T08:07:44","slug":"python%e9%80%86%e5%90%91","status":"publish","type":"post","link":"https:\/\/www.sanjiuctf.com\/?p=350","title":{"rendered":"python\u9006\u5411"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full is-resized\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/www.sanjiuctf.com\/wp-content\/uploads\/2025\/11\/image-74.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"770\" data-original=\"https:\/\/www.sanjiuctf.com\/wp-content\/uploads\/2025\/11\/image-74.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-351\" style=\"width:359px;height:auto\"  sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u662f\u4e00\u4e2a.pyc\u7684\u6587\u4ef6<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u4e0b\u8f7dpip install uncompyle6<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u53cd\u7f16\u8bd1<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>D:&gt;uncompyle6 target.pyc\nD:pythonLibsite-packagesclickcore.py:1213: UserWarning: The parameter --version is used more than once. Remove its duplicate as parameters should be unique.\n  parser = self.make_parser(ctx)\nD:pythonLibsite-packagesclickcore.py:1206: UserWarning: The parameter --version is used more than once. Remove its duplicate as parameters should be unique.\n  self.parse_args(ctx, args)\n# uncompyle6 version 3.9.2\n# Python bytecode version base 3.8.0 (3413)\n# Decompiled from: Python 3.12.0 (tags\/v3.12.0:0fb18b0, Oct  2 2023, 13:03:39) &#91;MSC v.1935 64 bit (AMD64)]\n# Embedded file name: \u592a\u597d\u4e86\u662fpython\u7cd5\u624b\u6211\u4eec\u6709\u6551\u4e86.py\n# Compiled at: 2025-10-04 20:43:26\n# Size of source mod 2**32: 1347 bytes\ncipher = &#91;\n 48, 55, 57, 50, 53, 55, 53, 50, 52, 50, 48, 55, 101, 52, 53, 50,\n 52, 50, 52, 50, 48, 55, 53, 55, 55, 55, 50, 54, 53, 55, 54, 55,\n 55, 55, 53, 54, 98, 55, 97, 54, 50, 53, 56, 52, 50, 52, 99, 54,\n 50, 50, 52, 50, 50, 54]\n\ndef str_to_hex_bytes(s: str) -&gt; bytes:\n    return s.encode(\"utf-8\")\n\ndef enc(data: bytes, key: int) -&gt; bytes:\n    return bytes(&#91;b ^ key for b in data])\n\ndef en3(b: int) -&gt; int:\n    return b &lt;&lt; 4 &amp; 240 | b &gt;&gt; 4 &amp; 15\n\ndef en33(data: bytes, n: int) -&gt; bytes:\n    \"\"\"\u6574\u4f53 bitstream \u5faa\u73af\u5de6\u79fb n \u4f4d\"\"\"\n    bit_len = len(data) * 8\n    n = n % bit_len\n    val = int.from_bytes(data, \"big\")\n    val = (val &lt;&lt; n | val &gt;&gt; bit_len - n) &amp; (1 &lt;&lt; bit_len) - 1\n    return val.to_bytes(len(data), \"big\")\n\nif __name__ == \"__main__\":\n    flag = \"\"\n    data = str_to_hex_bytes(flag)\n    data = enc(data, 17)\n    data = bytes(&#91;en3(b) for b in data])\n    data = data&#91;None&#91;None:-1]]\n    data = en33(data, 32)\n    if data.hex() == cipher:\n        print(\"Correct! \")\n    else:\n        print(\"Wrong\uff01\uff01\uff01\uff01\uff01\uff01\uff01\uff01\")\n\n# okay decompiling target.pyc\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a\u4ee3\u7801\u52a0\u5bc6\u8fc7\u7a0b<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>1.\u5c06flag\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5b57\u8282\u5e8f\u5217\uff08UTF-8\u7f16\u7801\uff09\n2.\u5bf9\u6bcf\u4e2a\u5b57\u8282\u4e0e17\u8fdb\u884c\u5f02\u6216\n3.\u5bf9\u6bcf\u4e2a\u5b57\u8282\u8fdb\u884c\u9ad8\u4f4e4\u4f4d\u4ea4\u6362\uff08en3\u51fd\u6570\uff09\n4.\u5bf9\u6574\u4e2a\u5b57\u8282\u5e8f\u5217\u8fdb\u884c\u5207\u7247\u64cd\u4f5c\uff1adata&#91;None&#91;None:-1]]\uff0c\u8fd9\u4e2a\u5199\u6cd5\u770b\u8d77\u6765\u6709\u95ee\u9898\uff0c\u5b9e\u9645\u4e0a\u53ef\u80fd\u662f\u53cd\u7f16\u8bd1\u7684\u9519\u8bef\u3002\u6839\u636e\u4e0a\u4e0b\u6587\uff0c\u8fd9\u4e2a\u5207\u7247\u64cd\u4f5c\u53ef\u80fd\u662f\u53cd\u8f6c\u5b57\u8282\u5e8f\u5217\uff0c\u5373data&#91;::-1]\u3002\n5.\u5bf9\u6574\u4e2a\u5b57\u8282\u5e8f\u5217\u8fdb\u884c\u5faa\u73af\u5de6\u79fb32\u4f4d\uff08en33\u51fd\u6570\uff09<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u52a0\u5bc6\u6b65\u9aa4\u7684\u9006\u5e8f\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u6574\u4f53bitstream\u5faa\u73af\u53f3\u79fb32\u4f4d\uff08de33\u51fd\u6570\uff09<\/li>\n\n\n\n<li>\u53cd\u8f6c\u5b57\u8282\u987a\u5e8f\uff08\u518d\u6b21\u53cd\u8f6c\uff09<\/li>\n\n\n\n<li>\u5bf9\u6bcf\u4e2a\u5b57\u8282\u8fdb\u884c\u9ad8\u4f4e4\u4f4d\u4ea4\u6362\uff08\u4e0een3\u76f8\u540c\uff0c\u56e0\u4e3a\u4ea4\u6362\u4e24\u6b21\u7b49\u4e8e\u672c\u8eab\uff09<\/li>\n\n\n\n<li>\u5bf9\u6bcf\u4e2a\u5b57\u8282\u4e0e17\u8fdb\u884c\u5f02\u6216\uff08\u4e0e\u52a0\u5bc6\u76f8\u540c\uff0c\u56e0\u4e3a\u5f02\u6216\u4e24\u6b21\u7b49\u4e8e\u672c\u8eab\uff09<\/li>\n\n\n\n<li>\u5c06\u5b57\u8282\u89e3\u7801\u4e3a\u5b57\u7b26\u4e32<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">py3\u89e3\u5bc6\u4ee3\u7801:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>cipher = &#91;\n    48, 55, 57, 50, 53, 55, 53, 50, 52, 50, 48, 55, 101, 52, 53, 50,\n    52, 50, 52, 50, 48, 55, 53, 55, 55, 55, 50, 54, 53, 55, 54, 55,\n    55, 55, 53, 54, 98, 55, 97, 54, 50, 53, 56, 52, 50, 52, 99, 54,\n    50, 50, 52, 50, 50, 54\n]\n\ndef de3(b: int) -&gt; int:\n    \"\"\"en3 \u7684\u9006\u64cd\u4f5c - \u9ad8\u4f4e4\u4f4d\u4ea4\u6362\"\"\"\n    return b &lt;&lt; 4 &amp; 240 | b &gt;&gt; 4 &amp; 15\n\ndef de33(data: bytes, n: int) -&gt; bytes:\n    \"\"\"en33 \u7684\u9006\u64cd\u4f5c - \u6574\u4f53 bitstream \u5faa\u73af\u53f3\u79fb n \u4f4d\"\"\"\n    bit_len = len(data) * 8\n    n = n % bit_len\n    val = int.from_bytes(data, \"big\")\n    val = (val &gt;&gt; n | val &lt;&lt; bit_len - n) &amp; ((1 &lt;&lt; bit_len) - 1)\n    return val.to_bytes(len(data), \"big\")\n\ndef decrypt():\n    # \u5c06 cipher \u5217\u8868\u8f6c\u6362\u4e3a\u5b57\u8282\n    # cipher \u5b9e\u9645\u4e0a\u662f\u5341\u516d\u8fdb\u5236\u5b57\u7b26\u4e32\u7684 ASCII \u7801\u503c\n    hex_str = ''.join(chr(x) for x in cipher)\n    print(f\"Hex string: {hex_str}\")\n\n    # \u5c06\u5341\u516d\u8fdb\u5236\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5b57\u8282\n    data = bytes.fromhex(hex_str)\n    print(f\"\u539f\u59cb\u6570\u636e: {data.hex()}\")\n\n    # \u89e3\u5bc6\u6b65\u9aa4\uff08\u4e0e\u52a0\u5bc6\u76f8\u53cd\u7684\u987a\u5e8f\uff09\uff1a\n    # 1. \u5faa\u73af\u53f3\u79fb32\u4f4d\uff08\u52a0\u5bc6\u662f\u5de6\u79fb\uff09\n    data = de33(data, 32)\n    print(f\"\u5faa\u73af\u53f3\u79fb\u540e: {data.hex()}\")\n\n    # 2. \u53cd\u8f6c\u5b57\u8282\u987a\u5e8f\uff08\u52a0\u5bc6\u662f\u53cd\u8f6c\uff09\n    data = data&#91;::-1]\n    print(f\"\u53cd\u8f6c\u540e: {data.hex()}\")\n\n    # 3. \u9ad8\u4f4e4\u4f4d\u4ea4\u6362\uff08\u4e0e\u52a0\u5bc6\u76f8\u540c\uff0c\u56e0\u4e3a\u4ea4\u6362\u4e24\u6b21\u7b49\u4e8e\u539f\u503c\uff09\n    data = bytes(&#91;de3(b) for b in data])\n    print(f\"\u9ad8\u4f4e\u4f4d\u4ea4\u6362\u540e: {data.hex()}\")\n\n    # 4. \u5f02\u621617\uff08\u4e0e\u52a0\u5bc6\u76f8\u540c\uff0c\u56e0\u4e3a\u5f02\u6216\u4e24\u6b21\u7b49\u4e8e\u539f\u503c\uff09\n    data = bytes(&#91;b ^ 17 for b in data])\n    print(f\"\u5f02\u6216\u89e3\u5bc6\u540e: {data.hex()}\")\n\n    # \u5c1d\u8bd5\u89e3\u7801\n    try:\n        flag = data.decode('utf-8')\n        return flag\n    except UnicodeDecodeError:\n        # \u5982\u679cUTF-8\u89e3\u7801\u5931\u8d25\uff0c\u5c1d\u8bd5\u5176\u4ed6\u7f16\u7801\u6216\u76f4\u63a5\u663e\u793a\u5b57\u8282\n        print(f\"\u89e3\u7801\u5931\u8d25\uff0c\u539f\u59cb\u5b57\u8282: {data}\")\n        return None\n\n# \u6267\u884c\u89e3\u5bc6\nif __name__ == \"__main__\":\n    flag = decrypt()\n    if flag:\n        print(f\"nFlag: {flag}\")\n    else:\n        print(\"\u89e3\u5bc6\u6210\u529f\u4f46\u65e0\u6cd5\u89e3\u7801\u4e3a\u6709\u6548\u5b57\u7b26\u4e32\")<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/www.sanjiuctf.com\/wp-content\/uploads\/2025\/11\/image-75.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1010\" height=\"279\" data-original=\"https:\/\/www.sanjiuctf.com\/wp-content\/uploads\/2025\/11\/image-75.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-352\"  sizes=\"auto, (max-width: 1010px) 100vw, 1010px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/www.sanjiuctf.com\/wp-content\/uploads\/2025\/11\/image-76.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"745\" height=\"201\" data-original=\"https:\/\/www.sanjiuctf.com\/wp-content\/uploads\/2025\/11\/image-76.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-353\"  sizes=\"auto, (max-width: 745px) 100vw, 745px\" \/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">SYC{jtfgdsfda554_a54d8as53}<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u662f\u4e00\u4e2a.pyc\u7684\u6587\u4ef6 \u53cd\u7f16\u8bd1 \u8fd9\u4e2a\u4ee3\u7801\u52a0\u5bc6\u8fc7\u7a0b \u52a0\u5bc6\u6b65\u9aa4\u7684\u9006\u5e8f\uff1a py3\u89e3\u5bc6\u4ee3\u7801: SYC{jtfgdsfda [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10,9],"tags":[],"class_list":["post-350","post","type-post","status-publish","format-standard","hentry","category-10","category-wp"],"_links":{"self":[{"href":"https:\/\/www.sanjiuctf.com\/index.php?rest_route=\/wp\/v2\/posts\/350","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sanjiuctf.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.sanjiuctf.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.sanjiuctf.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sanjiuctf.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=350"}],"version-history":[{"count":1,"href":"https:\/\/www.sanjiuctf.com\/index.php?rest_route=\/wp\/v2\/posts\/350\/revisions"}],"predecessor-version":[{"id":354,"href":"https:\/\/www.sanjiuctf.com\/index.php?rest_route=\/wp\/v2\/posts\/350\/revisions\/354"}],"wp:attachment":[{"href":"https:\/\/www.sanjiuctf.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=350"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sanjiuctf.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=350"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sanjiuctf.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=350"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}