{"id":205,"date":"2025-01-14T13:17:50","date_gmt":"2025-01-14T05:17:50","guid":{"rendered":"https:\/\/www.okabe.xin\/?p=205"},"modified":"2025-01-14T13:17:50","modified_gmt":"2025-01-14T05:17:50","slug":"%e9%87%8d%e5%ba%86ctf","status":"publish","type":"post","link":"https:\/\/www.okabe.xin\/wordpress\/?p=205","title":{"rendered":"\u91cd\u5e86CTF"},"content":{"rendered":"\n

\u4e5d\u4e5d\u5f52\u4e00<\/strong><\/h1>\n\n\n\n

\u6253\u5f00\u9644\u4ef6<\/p>\n\n\n\n

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45 33 35 44 6f 46 2b 72 67 4d 71 71 74 5a 7a 67 73 44 6a 44 6d 4f 31 4e 37 30 42 55 79 67 6d 44 59 39 45 57 77 59 41 41 41 41 41 53 55 56 4f 52 4b 35 43 59 49 49 3d 69 56 42 4f 52 77 30 4b 47 67 6f 41 41 41 41 4e 53 55 68 45 55 67 41 41 41 44 77 41 41 41 41 38 41 51 41 41 41 41 41 53 68 2b 54 66 41 41 41 41 55 30 6c 45 51 56 52 34 6e 4d 33 51 4d 52 4b 41 4d 41 68 45 30 55 66 47 50 72 6d 42 39 37 38 64 4f 51 45 32 32 6a 6e 59 75 68 58 46 6e 2f 30 41 53 69 62 44 6e 64 64 68 54 36 64 73 47 4b 53 73 37 48 72 69 34 58 70 58 56 65 58 38 32 69 66 43 36 70 67 44 74 57 58 30 50 62 41 2f 58 4f 68 64 41 37 47 30 2f 78 6e 4d 4b 75 31 64 66 38 73 46 57 59 45 57 41 56 7a 58 32 45 4d 41 41 41 41 41 53 55 56 4f 52 4b 35 43 59 49 49 3d 69 56 42 4f 52 77 30 4b 47 67 6f 41 41 41 41 4e 53 55 68 45 55 67 41 41 41 44 77 41 41 41 41 38 41 51 41 41 41 41 41 53 68 2b 54 66 41 41 41 41 56 30 6c 45 51 56 52 34 6e 4d 32 51 4d 51 71 41 41 41 77 44 54 33 45 2f 2f 2f 2f 4b 2b 49 49 34 69 43 41 6f 6e 65 33 53 6b 67 51 75 46 48 34 32 52 6d 78 59 62 2b 46 39 6b 45 68 70 70 6b 77 74 6b 53 6d 7a 37 52 7a 75 58 55 61 57 30 57 62 75 59 34 4e 30 79 69 78 65 2b 78 67 37 4e 35 49 76 36 38 45 69 78 4a 47 46 6f 58 35 61 44 78 61 52 5a 76 72 50 43 59 58 58 4a 43 6e 69 50 54 61 79 41 41 41 41 41 45 6c 46 54 6b 53 75 51 6d 43 43 69 56 42 4f 52 77 30 4b 47 67 6f 41 41 41 41 4e 53 55 68 45 55 67 41 41 41 44 77 41 41 41 41 38 41 51 41 41 41 41 41 53 68 2b 54 66 41 41 41 41 5a 55 6c 45 51 56 52 34 6e 49 57 52 73 51 33 44 51 41 7a 45 2b 49 62 37 38 77 62 5a 66 79 78 76 63 42 76 51 6a 56 4d 6c 30 4b 75 36 67 75 42 42 45 6c 68 41 44 74 37 35 44 52 51 49 48 52 6b 44 7a 65 7a 42 4a 6b 30 6e 4a 6d 4c 64 65 46 4c 4e 37 4a 47 59 5a 50 52 45 4b 55 79 65 34 32 59 46 4e 70 34 53 6e 42 6c 53 39 57 2f 46 4e 79 79 38 62 75 41 61 39 32 70 32 58 53 63 66 36 4a 72 2f 6c 55 59 63 62 2f 67 41 72 73 73 74 73 70 74 67 72 35 63 41 41 41 41 41 53 55 56 4f 52 4b 35 43 59 49 49 3d 69 56 42 4f 52 77 30 4b 47 67 6f 41 41 41 41 4e 53 55 68 45 55 67 41 41 41 44 77 41 41 41 41 38 41 51 41 41 41 41 41 53 68 2b 54 66 41 41 41 41 55 6b 6c 45 51 56 52 34 6e 4d 32 50 73 51 33 41 4d 41 7a 44 6d 44 36 67 2f 6e 2b 6c 63 67 47 37 64 43 76 67 72 4e 58 6b 51 53 43 74 56 62 69 7a 34 65 4c 4e 39 30 41 4d 7a 64 69 4a 53 64 4f 4f 6e 4d 51 36 63 6c 61 42 4c 50 66 45 41 54 57 4d 4c 71 49 35 2f 4b 78 4b 54 74 75 72 5a 6e 51 6c 56 55 66 4f 74 57 47 7a 5a 74 66 50 38 67 42 32 69 79 64 6a 50 33 35 38 6a 51 41 41 41 41 42 4a 52 55 35 45 72 6b 4a 67 67 67 3d 3d 69 56 42 4f 52 77 30 4b 47 67 6f 41 41 41 41 4e 53 55 68 45 55 67 41 41 41 44 77 41 41 41 41 38 41 51 41 41 41 41 41 53 68 2b 54 66 41 41 41 41 54 6b 6c 45 51 56 52 34 6e 4d 32 4f 77 52 47 41 4d 42 41 43 4e 7a 5a 77 36 62 39 4b 55 67 46 2b 54 4d 5a 48 46 4a 2f 65 69 7a 6c 32 41 50 6a 5a 53 62 59 46 78 33 78 73 52 47 65 30 74 72 65 57 63 4d 63 4b 7a 4e 43 6a 64 65 75 4b 44 45 49 51 4e 71 4f 79 51 30 35 39 32 4b 4d 4c 65 38 76 42 70 63 51 55 55 74 68 38 41 6c 72 73 47 70 59 46 2f 4a 7a 39 41 41 41 41 41 45 6c 46 54 6b 53 75 51 6d 43 43 69 56 42 4f 52 77 30 4b 47 67 6f 41 41 41 41 4e 53 55 68 45 55 67 41 41 41 44 77 41 41 41 41 38 41 51 41 41 41 41 41 53 68 2b 54 66 41 41 41 41 59 55 6c 45 51 56 52 34 6e 49 57 50 4d 52 4c 44 51 41 67 44 39 32 37 53 77 2f 39 66 71 62 78 67 30 39 69 70 37 49 4e 4b 4d 77 69 4a 68 57 41 43 6d 32 73 65 68 4e 6a 39 76 4c 6f 46 56 66 68 79 2f 76 63 59 72 58 4d 58 42 54 70 34 78 50 4c 63 39 61 48 57 47 38 34 74 6c 69 74 41 6e 37 73 4d 4e 58 41 56 68 6f 6e 4c 4d 75 65 63 54 66 50 74 49 51 66 44 77 4c 37 54 4f 4f 55 45 38 2f 62 47 4e 54 2f 59 71 53 67 35 59 63 74 78 55 51 41 41 41 41 42 4a 52 55 35 45 72 6b 4a 67 67 67 3d 3d 69 56 42 4f 52 77 30 4b 47 67 6f 41 41 41 41 4e 53 55 68 45 55 67 41 41 41 44 77 41 41 41 41 38 41 51 41 41 41 41 41 53 68 2b 54 66 41 41 41 41 55 6b 6c 45 51 56 52 34 6e 4d 32 50 77 52 47 41 51 41 77 43 56 78 76 67 4f 72 44 2f 37 72 41 43 2f 4b 67 66 39 66 6a 4b 69 35 6d 51 54 51 41 4c 47 56 5a 4f 50 51 30 4f 7a 6a 79 7a 62 6f 54 78 50 72 6f 35 4d 76 6c 59 76 38 78 69 45 50 75 59 63 6a 42 52 75 35 57 45 30 6b 73 32 4c 68 79 6a 31 68 30 70 74 45 79 43 32 6a 38 2f 30 77 48 48 55 78 37 2b 53 33 30 67 49 77 41 41 41 41 42 4a 52 55 35 45 72 6b 4a 67 67 67 3d 3d<\/pre>\n\n\n\n
\u4e00\u773c16\u8fdb\u5236\uff0c\u8f6c\u5b57\u7b26<\/p>\n\n\n\n
\u968f\u6ce2\u9010\u6d41\u8f6c\u5373\u53ef<\/p>\n\n\n\n
iVBORw0KGgoAAAANSUhEUgAAADwAAAA8AQAAAAASh+TfAAAAUElEQVR4nM2QsQ3AMAgEj8g93n\/KZ4JPEbmLoPU3gHQ6BHBdbAueM\/42FQFqmAW40OAByI5ZX9k1eGJ3KyDAUC1z0t0FkPLksXL8TyRiN8wLEPUTAyw6+sEAAAAASUVORK5CYII=iVBORw0KGgoAAAANSUhEUgAAADwAAAA8AQAAAAASh+TfAAAAX0lEQVR4nIWRMQ6AMAwDL4jd\/P+V7gvMUBYESjpZ6uWiJAWClTp43jcAMY57BiwNjCxPjBX9fb0YK5Mncu8pyLqyhl4KpGN28DV4wE35DoF+rgMqqtZzgsDjDmO1N70BUygmDY9EWwYAAAAASUVORK5CYII=iVBORw0KGgoAAAANSUhEUgAAADwAAAA8AQAAAAASh+TfAAAAU0lEQVR4nM3QMRKAMAhE0UfGPrmB978dOQE22jnYuhXFn\/0ASibDnddhT6dsGKSs7Hri4XpXVeX82ifC6pgDtWX0PbA\/XOhdA7G0\/xnMKu1df8sFWYEWAVzX2EMAAAAASUVORK5CYII=iVBORw0KGgoAAAANSUhEUgAAADwAAAA8AQAAAAASh+TfAAAAV0lEQVR4nM2QMQqAAAwDT3E\/\/\/\/K+II4iCAone3SkgQuFH42RmxYb+F9kEhppkwtkSmz7RzuXUaW0WbuY4N0yixe+xg7N5Iv68EixJGFoX5aDxaRZvrPCYXXJCniPTayAAAAAElFTkSuQmCCiVBORw0KGgoAAAANSUhEUgAAADwAAAA8AQAAAAASh+TfAAAAZUlEQVR4nIWRsQ3DQAzE+Ib78wbZfyxvcBvQjVMl0Ku6guBBElhADt75DRQIHRkDzezBJk0nJmLdeFLN7JGYZPREKUye42YFNp4SnBlS9W\/FNyy8buAa92p2XScf6Jr\/lUYcb\/gArsstsptgr5cAAAAASUVORK5CYII=iVBORw0KGgoAAAANSUhEUgAAADwAAAA8AQAAAAASh+TfAAAAUklEQVR4nM2PsQ3AMAzDmD6g\/n+lcgG7dCvgrNXkQSCtVbiz4eLN90AMzdiJSdOOnMQ6claBLPfEATWMLqI5\/KxKTturZnQlVUfOtWGzZtfP8gB2iydjP358jQAAAABJRU5ErkJggg==iVBORw0KGgoAAAANSUhEUgAAADwAAAA8AQAAAAASh+TfAAAATklEQVR4nM2OwRGAMBACNzZw6b9KUgF+TMZHFJ\/eizl2APjZSbYFx3xsRGe0treWcMcKzNCjdeuKDEIQNqOyQ0592KMLe8vBpcQUUth8AlrsGpYF\/Jz9AAAAAElFTkSuQmCCiVBORw0KGgoAAAANSUhEUgAAADwAAAA8AQAAAAASh+TfAAAAYUlEQVR4nIWPMRLDQAgD927Sw\/9fqbxg09ip7INKMwiJhWACm2sehNj9vLoFVfhy\/vcYrXMXBTp4xPLc9aHWG84tlitAn7sMNXAVhonLMuecTfPtIQfDwL7TOOUE8\/bGNT\/YqSg5YctxUQAAAABJRU5ErkJggg==iVBORw0KGgoAAAANSUhEUgAAADwAAAA8AQAAAAASh+TfAAAAUklEQVR4nM2PwRGAQAwCVxvgOrD\/7rAC\/Kgf9fjKi5mQTQALGVZOPQ0OzjyzboTxPro5MvlYv8xiEPuYcjBRu5WE0ks2Lhyj1h0ptEyC2j8\/0wHHUx7+S30gIwAAAABJRU5ErkJggg==<\/pre>\n\n\n\n
\u8fd9\u4e2a\u672b\u5c3e\u53cc\u7b49\u53f7<\/p>\n\n\n\n
\u4e00\u773cbase64<\/p>\n\n\n\n
\u6839\u636e\u5df2\u6709\u7ecf\u9a8c<\/p>\n\n\n\n
iVBORw0K\u5c31\u662fPNG\u7684\u6587\u4ef6\u5934\u7684base64\u5f62\u5f0f<\/p>\n\n\n\n
\u6240\u4ee5\u91cc\u9762\u662f\u4e2aPNG\u683c\u5f0f\u7684\u56fe\u7247<\/p>\n\n\n\n
\u540c\u65f6\u4e5f\u5f88\u5bb9\u6613\u53d1\u73b0\uff0ciVBORw0K\u8fd9\u4e2a\u4e0d\u6b62\u51fa\u73b0\u4e86\u4e00\u6b21<\/p>\n\n\n\n
\u4e5f\u5c31\u662f\u8bf4\u4e0d\u6b62\u6709\u4e00\u5f20\u56fe\u7247<\/p>\n\n\n\n
\u90a3\u6839\u636e\u9898\u76ee\uff0c\u5f88\u597d\u731c\u5230\u4f1a\u6709\u4e5d\u5f20\u56fe\u7247<\/p>\n\n\n\n
\u5206\u522b\u63d0\u53d6\u51fa\u6765\u8fd9\u4e5d\u5f20\u56fe\u7247<\/p>\n\n\n\n
\u5f97\u5230\u56fe\u7247\u5185\u5bb9<\/p>\n\n\n\n
\u5bf9\u9f50\uff0c\u626b\u63cf\uff0c\u5f97\u51faflag<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
flag{87f2c9a3-2b7e-11ee-be56-0242ac120002}<\/p>\n\n\n\n
Affine<\/strong><\/h1>\n\n\n\n
\u770b\u52a0\u5bc6\u6e90\u7801<\/p>\n\n\n\n
\u5199\u89e3\u7801\u7a0b\u5e8f<\/p>\n\n\n\n
def A(B, C):
    if B == 0:
        return (C, 0, 1)
    D, E, F = A(C % B, B)
    G = F - (C \/\/ B) * E
    H = E
    return (D, G, H)
\u200b
def I(J, K):
    D, L, _ = A(J, K)
    if D != 1:
        raise ValueError(f\"No modular inverse for {J} under modulo {K}\")
    return L % K
\u200b
def M(N):
    O = []
    for P in N:
        for Q in range(32, 127):
            R = 3 if Q % 2 != 0 else 127
            S = I(R, 128)
            if (R * Q + 3) % 128 == P:
                O.append(chr(Q))
                break
    return ''.join(O)
\u200b
T = [29, 23, 38, 56, 116, 34, 81, 75, 28, 44, 34, 44, 40, 10, 31, 79, 29, 44, 10, 79, 29, 44, 40, 10, 38, 33, 38, 50, 10, 79, 44, 31, 50, 28, 33, 44, 77, 31, 46, 75, 33, 122]
\u200b
U = M(T)
print(U)<\/pre>\n\n\n\n
\u8fd0\u884c\uff0c\u62ff\u5230flag<\/p>\n\n\n\n
flag{5283c5c7-d4fc-4fc7-abae-4cde3bc6d98b}<\/pre>\n\n\n\n
ez_moooo<\/strong><\/h1>\n\n\n\n
def a(b: int) -> str:
    c = []
    while b > 0:
        d = b & 0xFF
        b >>= 8
        e = None
        for f in \"abcdefghijklmnopqrstuvwxyz012345676879_-{}\":
            if pow(ord(f), 3, 113) == d:
                e = f
                break
        if e is None:
            raise ValueError(\"Decryption failed: No matching character found.\")
        c.append(e)
    return ''.join(reversed(c))
\u200b
g = 13886761501271471256742975735606875665043393810046672609286397781950883002410651016649476270428546593
\u200b
h = a(g)
print(h)<\/pre>\n\n\n\n
\u8fd0\u884c\uff0c\u62ff\u5230flag<\/p>\n\n\n\n
flag{1ef8d6e8-7d04-45ed-b5fb-976842142213}<\/pre>\n","protected":false},"excerpt":{"rendered":"
\u4e5d\u4e5d\u5f52\u4e00 \u6253\u5f00\u9644\u4ef6 69 56 42 4f 52 77 30 4b 47 67 6f 41 41 41 41  […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-205","post","type-post","status-publish","format-standard","hentry","category-ctf"],"_links":{"self":[{"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/205","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=205"}],"version-history":[{"count":0,"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/205\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=205"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=205"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=205"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}