Rating:
# Totem
> 100 Points
# Description
> Is this a dream or not? Use your totem to find out. Flag format: ctf{}.
> nc chal.ctf.b01lers.com 2008
> [totem-template.py](totem-template.py)
# Solution
We just have to implement the **cipher decoding algorithms** in python and modify the script.
### Script - [totem_solve.py](totem_solve.py)
```py
from pwn import *
import codecs
from base64 import b64decode
from string import ascii_lowercase
HOST = 'chal.ctf.b01lers.com'
PORT = 2008
r = remote(HOST,PORT)
# https://www.geeksforgeeks.org/baconian-cipher/
def bacon(s):
# Do this
pt = ''
for i in range(0, len(s), 5):
code = s[i:i+5]
bin_code = code.replace('A', '0').replace('B', '1')
int_code = int(bin_code, 2)
ch = chr(97 + int_code)
pt += ch
return pt
def rot13(s):
# And this
return codecs.decode(s, 'rot_13')
# https://exercism.io/tracks/python/exercises/atbash-cipher/solutions/2b513bc799984cc7aeb53513b81824d7
def atbash(s):
# And this one
plain = "abcdefghijklmnopqrstuvwxyz"
cipher = "zyxwvutsrqponmlkjihgfedcba"
pt = ''
for x in s:
pt += plain[cipher.index(x)]
return pt
def Base64(s):
# Lastly this one
return base64.b64decode(s).decode()
if __name__ == '__main__':
count = 0
while True:
r.recvuntil('Method: ')
method = r.recvuntil('\n').strip()
r.recvuntil('Ciphertext: ')
argument = r.recvuntil('\n').strip()
result = globals()[method.decode()](argument.decode()) # :)
# result = method(argument)
r.recv()
r.sendline(result.encode())
count += 1
if count == 1000:
print(r.recv())
exit(0)
print("[+] Done >>> ", count)
```
# Flag
> ctf{4n_313g4nt_s01ut10n_f0r_tr4cking_r341ity}
