geocache_hint_decoder.py

#!/usr/bin/env python

ENCRYPTED_MESSAGE = ""
DECRYPTION_KEY_TOP = "A|B|C|D|E|F|G|H|I|J|K|L|M"
DECRYPTION_KEY_BOTTOM = "N|O|P|Q|R|S|T|U|V|W|X|Y|Z"

decrypted_message = ""
for letter in ENCRYPTED_MESSAGE: 
    find_1 = DECRYPTION_KEY_BOTTOM.find(letter.upper())
    find_2 = DECRYPTION_KEY_TOP.find(letter.upper())
    if find_1 > -1:
        decrypted_letter = DECRYPTION_KEY_TOP[find_1]
    elif find_2 > -1:
        decrypted_letter = DECRYPTION_KEY_BOTTOM[find_2]
    else:
        decrypted_letter = letter
    
    decrypted_letter = decrypted_letter.lower() if letter.islower() else decrypted_letter
    decrypted_message += decrypted_letter

print decrypted_message