چالش TurnOB¶

> file *
flag.enc: ASCII text, with no line terminators
turnob:   ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=60dbfb0af3f9c3f987d055cfc11f6da40cdbcf75, for GNU/Linux 3.2.0, stripped

> cat flag.enc
5c:1b:72:35:35:64:5c:6d:95:ef:69:a6:d6:09:f8:6d:bc:9d:f8:99:16:0e:d5:f8:16:f0:7a:a1:d2:09:aa:f8:a2:bb:f8:8c:d2:7e:a7:%

> echo -n 'abc' | ./turnob
12:1f:2c:%

from string import printable
from subprocess import Popen, PIPE, STDOUT

p = Popen(['./turnob'], stdout=PIPE, stdin=PIPE, stderr=STDOUT)
ans = p.communicate(input=printable.encode())[0].decode()


d = {j:i for i, j in zip(printable, ans.split(':'))}

with open("flag.enc") as f:
    s = f.read()

for i in s.split(':')[:-1]:
    print(d[i], end='')