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Python/ciphers/brute_force_caesar_cipher.py at Python-3.9rc2 · davgit/Python · GitHub

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def decrypt(message):

"""

>>> decrypt('TMDETUX PMDVU')

Decryption using Key #0: TMDETUX PMDVU

Decryption using Key #1: SLCDSTW OLCUT

Decryption using Key #2: RKBCRSV NKBTS

Decryption using Key #3: QJABQRU MJASR

Decryption using Key #4: PIZAPQT LIZRQ

Decryption using Key #5: OHYZOPS KHYQP

Decryption using Key #6: NGXYNOR JGXPO

Decryption using Key #7: MFWXMNQ IFWON

Decryption using Key #8: LEVWLMP HEVNM

Decryption using Key #9: KDUVKLO GDUML

Decryption using Key #10: JCTUJKN FCTLK

Decryption using Key #11: IBSTIJM EBSKJ

Decryption using Key #12: HARSHIL DARJI

Decryption using Key #13: GZQRGHK CZQIH

Decryption using Key #14: FYPQFGJ BYPHG

Decryption using Key #15: EXOPEFI AXOGF

Decryption using Key #16: DWNODEH ZWNFE

Decryption using Key #17: CVMNCDG YVMED

Decryption using Key #18: BULMBCF XULDC

Decryption using Key #19: ATKLABE WTKCB

Decryption using Key #20: ZSJKZAD VSJBA

Decryption using Key #21: YRIJYZC URIAZ

Decryption using Key #22: XQHIXYB TQHZY

Decryption using Key #23: WPGHWXA SPGYX

Decryption using Key #24: VOFGVWZ ROFXW

Decryption using Key #25: UNEFUVY QNEWV

"""

LETTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

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(f"Decryption using Key #{key}: {translated}")

def main():

message = input("Encrypted message: ")

message = message.upper()

decrypt(message)

if __name__ == "__main__":

import doctest

doctest.testmod()

main()