HACKCTF - 나는 해귀다

 

문제 화면

 

해당 문제는 다음과 같이 첨부파일 하나를 주고, 이를 풀어보면

 

사진

 

다음과 같은 사진 하나를 준다.

hex이야기가 나오니 ihex를 통해 hex를 봐보면

 

ihex화면

 

iend로 png파일 하나가 끝난 후에 더 코드가 있는 것을 보니 뒷부분만 추출해서 뽑아보았다.

 

2번째 화면

 

iend가 있어야하는데 거꾸로 된거를 봐서 뒤집어줘야겠다고 생각했다.

다만 고려해야할것이 그냥 뒤집으면 4321 --> 1234 가 되는데 hex특징상 4321 --> 2143 이 되어야하기에 그부분을 고려해서 코딩해줬다.

 

 

a = "82826042 AE444E45 49000000 001DC6AE DA679F36 2C0FFF7F EFFD0400 00A00944 0000A009 440000A0 09440000 A0094400 00A00944 0000A009 440000A0 09440000 A0094400 00A00944 0000A009 440000A0 09440000 A0094400 00A00944 0000A009 440000A0 09440000 A0094400 00A00944 0000A009 440000A0 09440000 A0094400 00A00944 0000A009 440000A0 09440000 A0094400 00A00944 0000A009 440000A0 09440000 A0094400 00A00944 0000A009 440000A0 09440000 A0094400 00A00944 0000A009 440000A0 09440000 A0094400 00A00944 0000A009 440000A0 09440000 A0094400 00A00944 0000A009 440000A0 09440000 A0094400 00A00944 0000A009 440000A0 09440000 A0094400 00A00944 0000A009 440000A0 09440000 A0094400 00A00944 0000A009 440000A0 09440000 A0094400 00A00944 0000A009 440000A0 09440000 A0094400 00A00944 0000A009 440000A0 09440000 A0094400 00A00944 0000A009 440000A0 09440000 A0094400 00A00944 0000A009 440000A0 09440000 A0094400 00A00944 0000A009 440000A0 09440000 A0094400 00A00944 0000A009 440000A0 09440000 A0094400 00A00944 0000A009 440000A0 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5BF7E3CC D1D75FBA 3642941D 2B47AEAA FDE0D7CB 098BFAB1 795B75F9 A353B36C 0EB774CD A0089156 AC2F0DDA FE721A34 5ECED734 B7916A66 1D703BBB 8C2FD695 1D73B1EC 5931D71E 375CD307 EF6D3683 0F176EC3 D1B815D7 96AF4DBC 9F2F47E0 9D4DC177 77A52F2F 508DDC66 E75B1CE4 CFAE4F70 C6C90E67 9CE65627 CE5AB098 5BDF939E B072DF25 F5E37C39 B926E6AB 8FADEAC1 AEDD14D5 5EAC2EB3 66693BAD 79BA476E DF1F6AAE DAC39B75 813F55AF D755DDCB 074312DE 533D23C3 E0A1BD59 D68AC4E7 3AC1D1B5 A61D4F2F 3D609ADB AE58D618 CB5FF419 7DBBEB97 E2F58CCC 0F556A38 BBB68025 5F498AFE 7E6B1368 C4C58AEA 70B9A46A D75535FC 6A375C0C 1D7EF4F8 BBAA3B27 19E21C39 6E307759 BF7AB6EB DB1796B7 7EB34CC3 DB3796AF 4DBC9F36 63E4ED46 8DFDD1EF D0F4A607 A91E94E0 D02F1E39 D4FAF4CC E79CFB4F DEC2F277 5DD30786 B2EB52F0 68C5E186 FBA33E4B 1DE44FB8 F32E31D6 19E9C6F1 F9BF5835 BD8149FD 5D73B6EF 3529EB5E 7EABCFFF BE56BE58 FC8EFEBE AD2D3DB9 BCBAFA9D 5AC6FEE5 47F5E25F FBE6EBE1 BAB75C3E 0B57A870 CDE12E1C ACBF7D3C 37833F6D 9A8E6B72 62EF726D A2AD686C 1C15C3AC 668B5F6E D0073BE9 315FCEEF 03627151 F5B03FD5 D854BF73 C1DB55B0 69703876 1BF3DC9D 51D93ACC 558776E3 18F5ABC2 AE62D1E3 1D468ADA 32946E15 28B796AF 4DBC9F1F 76DEA3DA 31D7ED27 C63F4E6E F19F5E39 9CF79F49 E6576701 B2A94F9B B15B8B4B E1FA0D75 49F25AEF D77BFC6F 0F631F23 C61FEF5E AC57D72E EB63B675 42668B4D 5E78E21B 9723B39F 79CE3735 76D61FE3 7B52B1BC F4A466E7 5B069A41 7EDDE5C1 52F3B2DE F8197175 1BD94F44 B87C69E5 C412FEF7 4A7138CD C6D85297 3EE4DB4D A0C9BEB6 EF0EAF0B F75F1E5B BF38DFA3 A00EF7D2 62BF9DAD 88EE6F51 BDC176FC 376F34BF 7FDF97BF D7FFA3CE FF27DB31 BD760D6C 5934B818 9E87A7FF 3AA3B676 9C40EB63 2E386EBA E7B6B794 1AAE79D4 5C3DBB17 54C5BCB5 7A6DE4F9 5356AD2B 7F37DDAB 86DADB4F 8C7A5F8B C399CF59 F15E6572 76B24DC7 C9ECB856 B7F1BB05 6519F25D 6F8BC7A3 BDF35B4F DDF86F23 72A3BAD8 3D61163E CA77FAE7 F452FF1B ADDCED79 99886E3C 8EF0BE1E A9EEABDA BE7B0F74 C4E0DB5B 2E1F05D3 CB6BC57E 6D865A8D BBCF44BC 73A63F6D 564D17ED C580AA66 F6A65EB7 116DC8B1 391DE1A6 EF55749B BFD6BAD7 F2E6247F 567EB7F5 F36D6E80 27DFEA3B 4FDC1FCE 620CDB7F 07678AE5 477CEF31 941D1B8C 83D7D4EC C9DB64EE A923E1BD 769B747F 80B32427 D68F896E 7E0CA93C BD3DE474 E6E602BB 9A94137E 3178F476 182D8DA7 D955CBDF B05C792E AC1A5B1E BFCB8377 EA1CFEB9 75BAF966 948D4F06 F91DDB4B 8DDC65D5 C4ECD66E 0B57A25B B7E90E1B FB587007 2BAFA00B A8ED3F70 7F398833 6DF60713 C5893AA3 A27AADB6 F3EBC66E EBD1B93F BDDDBCA9 23F97BED 36E8FEC7 B79E3BC9 AEEC0425 9379F5A3 E25B9F83 2A4F2F4F 791D39B9 80AEE6A5 04DF8C5E 3C18FDD5 B6B346FC F7930F4D 36B33DFA ED06FEA1 BBEF23BB 4B7733D5 CCED166E 0B57A25B B7E8CE3B FC507027 2927C627 A4FC132F 2AB68366 D0040F51 DA7EE0FE 731066DB C999A85C FCBA18AB DF1F1744 DD4754F1 99BAA61B 70D1A6FB 3C61195B 98382B75 247DAF22 9EA5F0F8 AA35F38E B9379F59 5F6DBFBC 1952797A 7BC0E9CE 4F50FEE4 A5BE6B66 112E1EAF CB787CF9 7533EBA5 C7A29DBC CDDA1372 76D7B78B DA76472F 67D7512F E9FBB4FE 2EE8FDD5 9AD4F556 6E0B579F 7D54F59F 2F4AECDC FA9DEB15 B970CF56 B89B7EF8 B833E3D0 040F51DA 7EE0FE73 1066DBEA 99AB671F B2AFD717 55EE9DBA BD93751D B3FF27DB 7A05C336 9A8D4611 D60AC6F1 A7CA923F A6BF65DC 52918F5A FAB8AA87 F43D7F5A 22BE5C6A 3E4DE7D6 57DB6FEF 06549E5E 9EF7DA73 B3D33BAA 63FE9865 BBA3F84E BA2CFEF2 765BEFD3 AD4CE5D2 F1F3E96E DA85DCD8 465A0CBD DB5BBD68 FD4E12EA 22DA76EF 91DFAFA3 C7FAE58F DBAD16E7 F5CDC16A F1D7E4AD 6C632B93 93C5F046 AD3BEFC4 F7746C4D BF7D247A D9FD9A90 8FF02931 5FCF8A89 C15940C1 8ED5F066 52F4DD91 7FCE54D1 9DF9B338 063D34FE 6123C19B 6D00B460 1D63EC6F 06DD9F9F A7B1D36E 4FEF5753 FBBBF993 79F595F6 DBC3827C CAF4CF5B 3DD8E577 3FB123FE 72F65BD4 87F4C3EC EC386FDB 421870F3 6F7A127F 5E7FCB50 C7F6AFEF F7747F5F 28783296 B3BF7F17 F3A4B4BF 05ABCE4D DB3C232E 5CFB3C57 7F31626D FBE933E6 F8536677 2E80EFF2 7D262BF9 D4A7F9CE 831DEBE0 CCA5E9AA 8AADFFB9 43AD81FC DF9C2EDD 5D34F270 E9A1AFBC B68FFDAA F33BB6B7 5247D4F1 9A6D89FD DAC88B0E 3C99379F 595E673E 1DDBCCAC 4F507E6F 2B05FBC5 32DD8F26 373CB79D 0FC98D6E F64777FB FECFA9D8 C6B30EFB 519F2BC9 4FA38B5E 34D9FA74 077E371B 3C7F0547 097C2E7D D819CAC4 C2F1DFAB DFAB72CE C4DBF7F6 53B17401 729315FC EA53FCFE 7B837C19 94BD34DD 4CE666CD ECA7776B 0BB717E4 3F4D1B77 E07C6587 29A0FDDD D0F753EC 1AADA3EF EE2DB47D CD035CDB CFAFCF33 9E2673A8 3DA7F2B7 1B50C4E7 6DF78B5C DFED5BDD 7EED93F5 C6C759DE B9CBB7E4 91FEC8FF 29F8F8B5 CDA6CFD3 D3383E3B AE0BF685 7F5F0339 5B6CAFF3 DCB23CA8 7E3EFF5F A0BE4E71 3863D446 7DEE7E3F 0FA00FCF A4C57F3A 94FF3D00 5FBED57E B94F2C2F 2E61DB62 975ABAE2 E74C1C27 8D7D85DB 8BF21FA6 2BB9A587 D7ED1B05 DD1B963C CD247FCD D5F157CA B80BDE44 E3DBBCFA CCFA00EA FFAC72E4 EFF73CCB AC7EEC63 3F3765C5 CBDBB496 24FF9FCF CAF2EEB6 594BAFB2 72EB336F EF247EEE 1AB1FB6E 2D7F69BA 8CD50983 E3B7705B B0C1F76F B1C0ACCC F9EB1FCF CFFBFD7E BF7B1FAD F7A1E529 BFB5FDFE 7FCFC7E3 F1F97DF7 A00C4F82 FA008270 A008F3F4 013CCB7D D6DB9680 2CBF8DBF 4011CFFE 7BC77CDC AB7EF3FB FD27F033 9EEDF1F7 C6FEEBF3 FC7FE672 D006CBEF 304923FC 7E3F06F7 9F9FEBFC 151EF67F EBEEF743 E3C6DFA0 08CDF000 2FEF7FCF C5DFFC7E 7FAFCCDF 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802510 00028025 10000280 25100002 80251000 02802410 00007FEF FE6B87AE D483C1C0 812D35F5 AF72AEDA A4A09200 71172F52 E660E327 4D1D3C72 03971BD0 05B638DB 81DBDDED 5E785441 4449C523 000064A8 6FC701C3 0E0000C3 0E000073 59487009 00000005 61FC0B8F B1000041 4D416704 000000E9 1CCEAE00 42475273 01000000 9D9A31F2 00000002 08DD0200 00800300 00524448 490D0000 000A1A0A 0D474E50 89"
a = a.replace(" ", "")
a = a[::-1]
print(a)
ret = ""
for i in range(0, len(a)-1) :
    if i % 2 == 0 :
        ret += a[i+1]
    elif i % 2 == 1 :
        ret += a[i-1]
print(ret)
 
 

 

위와같이 코드를 짜고 나온 부분을 다시 ihex에 넣어서 저장하면

 

flag사진

 

위와 같이 나오게 된다. 참고로 한번 더 뒤집으면 인증이 가능합니다.