{"id":2276,"date":"2026-06-15T09:38:02","date_gmt":"2026-06-15T01:38:02","guid":{"rendered":"https:\/\/shr1mp.top\/?p=2276"},"modified":"2026-06-16T18:48:22","modified_gmt":"2026-06-16T10:48:22","slug":"hnctf","status":"publish","type":"post","link":"https:\/\/shr1mp.top\/index.php\/2026\/06\/15\/hnctf\/","title":{"rendered":"H&NCTF\uff08\u672a\u5b8c\uff09"},"content":{"rendered":"\n

base\u73a9\u660e\u767d\u4e86<\/h2>\n\n\n\n
\n

hint\uff1aBBBBig5???<\/strong><\/p>\n<\/blockquote>\n\n\n\n

\u7ed9\u4e86\u4e00\u4e2a\u52a0\u5bc6\u7684zip\u548c\u4e00\u4e2aJPG\u6587\u4ef6\uff0c\u4e22\u8fdb\u968f\u6ce2\u9010\u6d41\uff0c\u53d1\u73b0JPG\u6587\u4ef6\u5c3e\u5b58\u5728\u989d\u5916\u6570\u636e<\/p>\n\n\n\n

\"\"\/<\/div><\/figure>\n\n\n\n

\u82e500\u662f\u5206\u9694\u7b26\uff0c\u90a3\u4e48\u591a\u7684\u6570\u636e\u5219\u4e3a\uff1a<\/p>\n\n\n\n

c46540cc76b79b<\/code><\/pre>\n\n\n\n
\u7531\u63d0\u793a\u731c\u6d4b\u5230\u662fbig5\u7f16\u7801<\/p>\n\n\n\n
\u5f97\u5230\uff1a<\/p>\n\n\n\n
46ZA90za2w==<\/code><\/pre>\n\n\n\n
\u7528\u8fd9\u4e2a\u5bc6\u7801\u53ef\u4ee5\u6253\u5f00\u538b\u7f29\u5305\uff0c\u6253\u5f00\u540e\u5f97\u5230\u4e00\u4e2aQRCode<\/p>\n\n\n\n
\"\"\/<\/div><\/figure>\n\n\n\n
\u6ce8\u610f\u5230\u524d\u9762\u7684\u5f97\u5230\u768446ZA90za2w==\uff0c\u8fd9\u4e32\u6570\u5b57\u51fa\u73b00\\9\\a\\z\\A \\Z\u3002\u731c\u6d4b\u662fBase62\u7f16\u7801\uff08\u4e0eBase64\u6bd4\u65e0+\/=<\/p>\n\n\n\n
\uff09,\u591a\u6b21\u5c1d\u8bd5\u540e\uff0c\u5f97\u5230\u89e3\u7801key\u662fa-z0-9A-Z<\/p>\n\n\n\n
\"\"\/<\/div><\/figure>\n\n\n\n
\u661f\u591c\u56de\u58f0\u6863\u6848<\/h3>\n\n\n\n
\u9996\u5148\u9898\u76ee\u9644\u4ef6\u662f\u4f2a\u52a0\u5bc6\uff0c\u6253\u5f00\u540e\u5f97\u5230\u4e00\u4e2adat<\/p>\n\n\n\n
\"\"\/<\/div><\/figure>\n\n\n\n
\u6839\u636e\u8fd9\u6bb5\u6570\u636e\uff0c\u63d0\u793a\u6211\u4eec\u5012\u8fc7\u6765\u8bfb\u6587\u4ef6\u5c3e\u7684\u6570\u636e\uff1a<\/p>\n\n\n\n
\"\"\/<\/div><\/figure>\n\n\n\n
\u518dBaase64\u5f97\u5230\uff1a<\/p>\n\n\n\n
\"\"\/<\/div><\/figure>\n\n\n\n
\u8fd9\u6bb5JSON\u6570\u636e\u610f\u5473\u7740\uff1a<\/p>\n\n\n\n
hint<\/code>\uff1a\u4ece offset 128<\/code> \u53d6 169<\/code> \u5b57\u8282\uff0cROT13 \u89e3\u7801\u3002
ppm<\/code>\uff1a\u4ece offset 1024<\/code> \u53d6 989094<\/code> \u5b57\u8282\uff0c\u6574\u4f53\u53cd\u8f6c\u5f97\u5230\u661f\u56fe\u3002
wav<\/code>\uff1a\u4ece offset 990118<\/code> \u53d6 60044<\/code> \u5b57\u8282\uff0c\u9010\u5b57\u8282 xor 35<\/code> \u5f97\u5230\u97f3\u9891\u3002<\/p>\n\n\n\n
rot13:<\/p>\n\n\n\n
The sky does not hide words in plain sight.\nOnly the brightest points remember the route.\nThe echo is honest because it repeats.\nA false note is louder than a true one<\/code><\/pre>\n\n\n\n
\u8fd9\u6bb5\u63d0\u793a\u544a\u8bc9\u6211\u4eec\u770b\u6700\u660e\u4eae\u7684\u70b9\u548c\u5173\u6ce8\u865a\u5047\u7684\u58f0\u97f3<\/p>\n\n\n\n
ppm\uff1a<\/p>\n\n\n\n
\"\"\/<\/div><\/figure>\n\n\n\n
    \n
  1. \u904d\u5386\u6bcf\u4e2a\u50cf\u7d20\u7684 r, g, b<\/code>\uff0c\u53ea\u6311\u9009\u4eae\u70b9\u50cf\u7d20\uff0c\u4e5f\u5c31\u662f max(r, g, b) >= 240<\/code> \u7684\u201c\u661f\u661f\u201d\u3002<\/li>\n\n\n\n
  2. \u5bf9\u8fd9\u4e9b\u4eae\u70b9\u7684 r\/g\/b<\/code> \u5206\u91cf\u5206\u522b\u53d6\u6700\u4f4e\u4f4d & 1<\/code>\uff0c\u62fc\u6210\u4e8c\u8fdb\u5236\u6bd4\u7279\u6d41\u3002<\/li>\n\n\n\n
  3. \u6bcf 8 \u4f4d\u8f6c\u6210 1 \u5b57\u8282\uff0c\u5f97\u5230\u9690\u85cf\u6570\u636e\u3002<\/li>\n\n\n\n
  4. \u5728\u9690\u85cf\u6570\u636e\u4e2d\u67e5\u627e part1=<\/code>\uff0c\u4e00\u76f4\u8bfb\u5230\u7a7a\u5b57\u8282 \\x00<\/code> \u4e3a\u6b62\u3002<\/li>\n\n\n\n
  5. \u518d\u4ece\u6d88\u606f\u91cc\u63d0\u53d6 rhythm=...<\/code>\uff0c\u8fdb\u884c Base64 \u89e3\u7801\u3002<\/li>\n<\/ol>\n\n\n\n
    import base64\nimport re\n\ndat = open(\"cosmic_archive.dat\", \"rb\").read()\n\nppm = dat[1024:1024 + 989094][::-1]\nopen(\"stars.ppm\", \"wb\").write(ppm)\n\ntokens = ppm.decode(\"ascii\").split()\nvalues = list(map(int, tokens[4:]))\n\nbits = []\nfor i in range(0, len(values), 3):\n    r, g, b = values[i:i+3]\n    if max(r, g, b) >= 240:\n        bits += [str(r & 1), str(g & 1), str(b & 1)]\n\ndata = bytes(int(\"\".join(bits)[i:i+8], 2) for i in range(0, len(bits)\/\/8*8, 8))\n\nstart = data.index(b\"part1=\")\nmsg = data[start:data.index(b\"\\x00\", start)]\n\nprint(msg.decode())\n\nrhythm = re.search(rb\"rhythm=([A-Za-z0-9+\/=]+)\", msg).group(1)\nprint(base64.b64decode(rhythm).decode())<\/code><\/pre>\n\n\n\n
    \u5f97\u5230\u90e8\u5206flag<\/p>\n\n\n\n
    part1=flag{F4k3_Zip_St4rs_;rhythm=Yzg6MmE=<\/code><\/pre>\n\n\n\n
    Yzg6MmE=\u7ecf\u8fc7Base64\u89e3\u5bc6\u540e\u5f97\u5230\uff1a<\/p>\n\n\n\n
    c8:2a<\/code><\/pre>\n\n\n\n
    \u9996\u5148\uff0cWAV \u53c2\u6570\u662f\uff1a\u5355\u58f0\u9053\u30018-bit\u30018000 Hz\u300160000<\/code> \u4e2a\u91c7\u6837\u70b9\u3002<\/p>\n\n\n\n
    \u4e0a\u4e00\u6b65\u661f\u56fe\u91cc\u5f97\u5230 rhythm=c8:2a<\/code>\uff0cBase64 \u89e3\u7801\u662f c8:2a<\/code>\uff0c\u5176\u4e2d 0xc8 = 200<\/code>\uff0c\u6240\u4ee5\u628a PCM \u6570\u636e\u6309\u6bcf 200<\/code> \u4e2a\u91c7\u6837\u5206\u5757\u3002<\/p>\n\n\n\n
    \u97f3\u9891 hint \u91cc\u8bf4 \u201cecho repeats \/ false note is louder\u201d\uff0c\u6240\u4ee5\u7528\u7b2c 0 \u5757\u4f5c\u4e3a\u91cd\u590d\u56de\u58f0\u57fa\u51c6\uff0c\u9010\u5757\u6bd4\u8f83\u5dee\u5f02\u3002<\/p>\n\n\n\n
    \u53d1\u73b0\u51e0\u4e4e\u6240\u6709\u6709\u6548\u5dee\u5f02\u90fd\u96c6\u4e2d\u5728\u5757\u5185\u4f4d\u7f6e 137<\/code>\uff0c\u8fd9\u662f\u88ab\u66ff\u6362\u7684\u201cfalse note\u201d\u3002<\/p>\n\n\n\n
    \u53d6\u7b2c 0 \u5757\u8be5\u4f4d\u7f6e\u7684\u539f\u59cb\u5b57\u8282\uff0c\u52a0\u4e0a\u540e\u7eed\u5dee\u5f02\u5757\u8be5\u4f4d\u7f6e\u7684\u5b57\u8282\uff0c\u76f4\u5230\u9047\u5230\u5206\u9694\u7528\u7684\u672a\u53d8\u5316\u5757\u3002<\/p>\n\n\n\n
    \u5f97\u5230\u5b57\u8282\u5e8f\u5217\uff1a[107, 68, 78, 117, 105, 26, 89, 71, 27, 73, 117, 111, 73, 66, 26, 87]<\/p>\n\n\n\n
    \u7528 0x2a<\/code> \u9010\u5b57\u8282\u5f02\u6216\uff0c\u5f97\u5230\u97f3\u9891\u91cc\u7684\u5269\u4f59\u90e8\u5206\uff1a<\/p>\n\n\n\n
    And_C0sm1c_Ech0}\n\n\n<\/code><\/pre>\n\n\n\n
    \u5f97\u5230flag\uff1aflag{F4k3_Zip_St4rs_And_C0sm1c_Ech0}<\/p>\n\n\n\n
      \n
    1. <\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"
      base\u73a9\u660e\u767d\u4e86 hint\uff1aBBBBig5??? \u7ed9\u4e86\u4e00\u4e2a\u52a0\u5bc6\u7684zip\u548c\u4e00\u4e2aJPG\u6587\u4ef6\uff0c\u4e22\u8fdb\u968f\u6ce2\u9010\u6d41\uff0c\u53d1\u73b0JP […]<\/p>\n","protected":false},"author":1,"featured_media":1002,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_gspb_post_css":"","footnotes":""},"categories":[9],"tags":[],"class_list":["post-2276","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-misc"],"_links":{"self":[{"href":"https:\/\/shr1mp.top\/index.php\/wp-json\/wp\/v2\/posts\/2276","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/shr1mp.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/shr1mp.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/shr1mp.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/shr1mp.top\/index.php\/wp-json\/wp\/v2\/comments?post=2276"}],"version-history":[{"count":22,"href":"https:\/\/shr1mp.top\/index.php\/wp-json\/wp\/v2\/posts\/2276\/revisions"}],"predecessor-version":[{"id":2301,"href":"https:\/\/shr1mp.top\/index.php\/wp-json\/wp\/v2\/posts\/2276\/revisions\/2301"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/shr1mp.top\/index.php\/wp-json\/wp\/v2\/media\/1002"}],"wp:attachment":[{"href":"https:\/\/shr1mp.top\/index.php\/wp-json\/wp\/v2\/media?parent=2276"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/shr1mp.top\/index.php\/wp-json\/wp\/v2\/categories?post=2276"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/shr1mp.top\/index.php\/wp-json\/wp\/v2\/tags?post=2276"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}