ROT-13 / Caesar

Caesar Cipher

Python

bandit11@bandit:~$ python
Python 2.7.13 (default, Sep 26 2018, 18:42:22) 
[GCC 6.3.0 20170516] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import codecs
>>> codecs.decode("Gur cnffjbeq vf 5Gr8L4qetPEsPk8htqjhRK8XSP6x2RHh", "rot_13")
u'The password is passwordBandit12'

Online

ROT13 decoder: Decrypt and convert ROT13 to textcryptii

Caesar cipher: Encode and decode onlinecryptii

Script

# coding=utf-8

# caesar cipher 2 - picoCTF2018
# Inspiré de: https://www.tutorialspoint.com/cryptography_with_python/cryptography_with_python_caesar_cipher

message = 'PICO#4&[C!ESA2?#I0H%R3?JU34?A2%N4?S%C5R%]' #encrypted message

characters = list(map(chr, range(32,126)))
LETTERS = ''.join(characters)

for key in range(len(LETTERS)):
   translated = ''
   for symbol in message:
      if symbol in LETTERS:
         num = LETTERS.find(symbol)
         num = num - key
         if num < 0:
            num = num + len(LETTERS)
         translated = translated + LETTERS[num]
      else:
         translated = translated + symbol
   print('key #%s: %s' % (key, translated))

Sources

OverTheWire - Bandit 20xSs0rZ

PicoCTF 2018 - Cryptography0xSs0rZ