break_caesar.py

# decrypt the Caesar cipher by brute force

ciphertext = "hpwwozypjzfnclnvpoespnzopjzflcpyzhlyzqqtntlwnzopmcplvpcszhhzfwojzftxaczgpespnlpdlcntaspcezxlvpteslcopcezmcplvcplozyezespypiedepaezqtyozfe"

# Code #2 at https://www.geeksforgeeks.org/python-split-string-into-list-of-characters/
def split(word):
    return list(word)


def decrypt(char, offset):
    result = ''
    if (char.isupper()):
        result += chr((ord(char) - offset - 65) % 26 + 65)
    else:
        result += chr((ord(char) - offset - 97) % 26 + 97)
    return result


for i in range(1, 26):
    print('offset :', i)
    for c in split(ciphertext):
        print(decrypt(c,i),end='')
    print()