{"id":337,"date":"2025-08-18T16:00:54","date_gmt":"2025-08-18T08:00:54","guid":{"rendered":"https:\/\/www.hurkin.top\/?p=337"},"modified":"2025-08-18T17:06:28","modified_gmt":"2025-08-18T09:06:28","slug":"lilctf-misc","status":"publish","type":"post","link":"https:\/\/www.hurkin.top\/index.php\/2025\/lilctf-misc\/","title":{"rendered":"LILCTF-MISC\u90e8\u5206"},"content":{"rendered":"

LILCTF-MISC\u90e8\u5206<\/h1>\n

PNG Master<\/h2>\n

\u6587\u4ef6\u5c3e\u90e8\u6709base64\uff0c\u89e3\u4e00\u4e0b<\/p>\n

flag1:4c494c4354467b<\/p>\n

\u7136\u540elsb\u9690\u5199<\/p>\n

exp<\/p>\n

# -*- coding: UTF-8 -*-\r\nfrom PIL import Image\r\ndef mod(x, y):\r\n    return x % y\r\ndef toasc(strr):\r\n    return int(strr, 2)\r\ndef func(le, str1, str2):\r\n    b = \"\"\r\n    im = Image.open(str1)\r\n    lenth = le * 8\r\n    width = im.size[0]\r\n    height = im.size[1]\r\n    count = 0\r\n    for h in range(0, height):\r\n        for w in range(0, width):\r\n            # \u83b7\u5f97(w,h)\u70b9\u50cf\u7d20\u7684\u503c\r\n            pixel = im.getpixel((w, h))\r\n            # \u6b64\u5904\u4f593\uff0c\u4f9d\u6b21\u4eceR\u3001G\u3001B\u4e09\u4e2a\u989c\u8272\u901a\u9053\u83b7\u5f97\u6700\u4f4e\u4f4d\u7684\u9690\u85cf\u4fe1\u606f\r\n            if count % 3 == 0:\r\n                count += 1\r\n                b = b + str(mod(int(pixel[0]), 2))\r\n                if count == lenth:\r\n                    break\r\n            if count % 3 == 1:\r\n                count += 1\r\n                b = b + str(mod(int(pixel[1]), 2))\r\n                if count == lenth:\r\n                    break\r\n            if count % 3 == 2:\r\n                count += 1\r\n                b = b + str(mod(int(pixel[2]), 2))\r\n                if count == lenth:\r\n                    break\r\n        if count == lenth:\r\n            break\r\n    with open(str2, \"wb\") as f:\r\n        for i in range(0, len(b), 8):\r\n            # \u4ee5\u6bcf8\u4f4d\u4e3a\u4e00\u7ec4\u4e8c\u8fdb\u5236\uff0c\u8f6c\u6362\u4e3a\u5341\u8fdb\u5236\r\n            stra = toasc(b[i:i+8])\r\n            # \u5c06\u8f6c\u6362\u540e\u7684\u5341\u8fdb\u5236\u6570\u89c6\u4e3aascii\u7801\uff0c\u518d\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u5199\u5165\u5230\u6587\u4ef6\u4e2d\r\n            f.write(bytes([stra]))\r\nif __name__ == \"__main__\":\r\n    le = 3000  # \u6587\u4ef6\u957f\u5ea6\r\n    # \u542b\u6709\u9690\u85cf\u4fe1\u606f\u7684\u56fe\u7247\r\n    new = r\"E:Downloada.png\"\r\n    # \u4fe1\u606f\u63d0\u53d6\u51fa\u540e\u6240\u5b58\u653e\u7684\u6587\u4ef6\r\n    tiqu = r\"E:Downloadget_flag.txt\"\r\n    func(le, new, tiqu)<\/code><\/pre>\n
\u83b7\u5f97flag2:5930755f3472335f4d<\/p>\n
\"\"<\/p>\n
\u5f88\u660e\u663e\u7684\uff0c\u591a\u4e86\u4e00\u4e2a\u5f02\u5e38\u5757\uff0c\u89e3\u538b\u51fa\u4e00\u4e2ahint.txt\u548csecret.bin<\/p>\n
\u63d0\u793a\u96f6\u5bbd\uff0c\u53bb\u89e3\u4e00\u4e0b<\/p>\n
\"\"<\/p>\n
\"\"<\/p>\n
\u8fde\u5728\u4e00\u8d77\u83b7\u5f97flag<\/p>\n
LILCTF{Y0u_4r3_Mas7er_in_PNG}<\/p>\n
\u63d0\u524d\u653e\u51fa\u9644\u4ef6<\/h2>\n
\u9996\u5148\u6784\u9020\u4e00\u4e2atar\u6587\u4ef6<\/p>\n
\"\"<\/p>\n
\u4e0d\u96be\u53d1\u73b0 \u6587\u4ef6\u7ed3\u6784\u5f88\u597d\u63a7\u5236\uff0c\u5168\u662f00000000<\/p>\n
\u6784\u9020tar\u5934\u53bb\u8fdb\u884c\u660e\u6587\u653b\u51fb\uff0c\u5f88\u5feb\u5c31\u51fa\u6765\u4e86\uff08\u5176\u5b9e\u6839\u636e\u5df2\u77e5LILCTF{\u4e5f\u53ef\u4ee5\u6784\u9020\u5185\u5bb9\u53bb\u6253\uff0c\u4f46\u662f\u504f\u79fb\u91cf\u4f1a\u6709\u70b9\u591a\uff09\"img\"<\/p>\n
LILCTF{Z1pCRyp70_1s_n0t_5ecur3}<\/code><\/pre>\n
\u662f\u8c01\u6ca1\u6709\u9605\u8bfb\u53c2\u8d5b\u987b\u77e5\uff1f<\/h2>\n
\u5c31\u5728\u8fd9\u91cc<\/p>\n
\"\"<\/p>\n
LILCTF{Me4n1ngFu1_w0rDs}<\/p>\n
v\u621150(R)MB<\/strong><\/h2>\n
\u5bf9\u8fd9\u4e2a\u56fe\u7247\u7684\u5730\u5740\u6293\u4e2a\u5305\uff0c\u91cd\u653e\u5c31\u80fd\u770b\u5230\u4ed6\u7684\u6b63\u786eContent-Type<\/code>\u5176\u5b9e\u662fimage\/png\"\"<\/code>\"img\"<\/p>\n
yakit\u5f00\u6e32\u67d3\u76f4\u63a5\u5c31\u80fd\u51fa\u5b8c\u6574\u56fe\u7247<\/p>\n
\"\"\"img\"<\/p>\n","protected":false},"excerpt":{"rendered":"
LILCTF-MISC\u90e8\u5206 PNG Master \u6587\u4ef6\u5c3e\u90e8\u6709base64\uff0c\u89e3\u4e00\u4e0b flag1:4c494c4354467b \u7136\u540el …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-337","post","type-post","status-publish","format-standard","hentry","category-some-competition"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.hurkin.top\/index.php\/wp-json\/wp\/v2\/posts\/337","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hurkin.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hurkin.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hurkin.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hurkin.top\/index.php\/wp-json\/wp\/v2\/comments?post=337"}],"version-history":[{"count":4,"href":"https:\/\/www.hurkin.top\/index.php\/wp-json\/wp\/v2\/posts\/337\/revisions"}],"predecessor-version":[{"id":345,"href":"https:\/\/www.hurkin.top\/index.php\/wp-json\/wp\/v2\/posts\/337\/revisions\/345"}],"wp:attachment":[{"href":"https:\/\/www.hurkin.top\/index.php\/wp-json\/wp\/v2\/media?parent=337"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hurkin.top\/index.php\/wp-json\/wp\/v2\/categories?post=337"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hurkin.top\/index.php\/wp-json\/wp\/v2\/tags?post=337"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}