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[原创]KCTF 2023 第八题 AI核心地带
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发表于: 2023-9-18 02:03
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输入范围是数字
COUNT & 1 == 1时，计算结果相加为 mod 10
COUNT & 1 != 1时，计算结果相加不为 mod 10，有其他校验
观察到401283，edi != 9 时为正确输入
修改程序爆破
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | def CCC(i): if(i & 1): num = (52 - (0xFFFEC610 >> (i % 0x1F))) % 10 else: num = (52 - (0xFFFEC610 >> (i % 0x1F))) % 10 return numimport subprocessimport osF = ""for L in range(1000): tempF = F print(tempF) num = CCC(L) if(L&1): F += chr(48+num) s = subprocess.Popen("Z.exe",stdout=subprocess.PIPE, stdin=subprocess.PIPE, shell=True) s.stdin.write((F).encode()+b"\n") s.stdin.close() out = s.stdout.read() if(b'OK' in out): print("ACCEPTED",F) exit(0) continue else: T=-1 for i in range(0,10): if(i == num): continue s = subprocess.Popen("Z.exe",stdout=subprocess.PIPE, stdin=subprocess.PIPE, shell=True) s.stdin.write((tempF+chr(48+i)).encode()+b"\n") s.stdin.close() out = s.stdout.read() s.stdout.close() if(b'OK' in out): F += chr(48+i) print("ACCEPTED",F) exit(0) if(b'FAIL' in out): F += chr(48+i) T=i break if(T==-1): print("Error") |
得到一个非常长的答案
582606981190746395118531851185249089744027265368693769576937697816165851808443150195011501950410798490871663488927792799277958360668112074539521851185318514909974002766535869476937695769681626582180144305010501950115040079949037162348792789277927995826067811907483951185218511853490897410272653986937694769376988161658318084433501950105019504207984904716634829277927892779584606681100745395418511852185149009740027365358697769376947696816365821809443050125019501050400790490371673487927
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