iframe-proxy | Sunbelt Computer Software

History

65 lines (49 loc) · 1.66 KB

Raw

LETTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

def main():

message = input("Enter message: ")

key = input("Enter key [alphanumeric]: ")

mode = input("Encrypt/Decrypt [e/d]: ")

if mode.lower().startswith("e"):

mode = "encrypt"

translated = encryptMessage(key, message)

elif mode.lower().startswith("d"):

mode = "decrypt"

translated = decryptMessage(key, message)

print("\n%sed message:" % mode.title())

print(translated)

def encryptMessage(key, message):

"""

>>> encryptMessage('HDarji', 'This is Harshil Darji from Dharmaj.')

'Akij ra Odrjqqs Gaisq muod Mphumrs.'

"""

return translateMessage(key, message, "encrypt")

def decryptMessage(key, message):

"""

>>> decryptMessage('HDarji', 'Akij ra Odrjqqs Gaisq muod Mphumrs.')

'This is Harshil Darji from Dharmaj.'

"""

return translateMessage(key, message, "decrypt")

def translateMessage(key, message, mode):

translated = []

keyIndex = 0

key = key.upper()

for symbol in message:

num = LETTERS.find(symbol.upper())

if num != -1:

if mode == "encrypt":

num += LETTERS.find(key[keyIndex])

elif mode == "decrypt":

num -= LETTERS.find(key[keyIndex])

num %= len(LETTERS)

if symbol.isupper():

translated.append(LETTERS[num])

elif symbol.islower():

translated.append(LETTERS[num].lower())

keyIndex += 1

if keyIndex == len(key):

keyIndex = 0

else:

translated.append(symbol)

return "".join(translated)

if __name__ == "__main__":

main()

Sunbelt Computer Software

PL/B Language Development and Support

Navigation Menu

Sunbelt Computer Software

PL/B Language Development and Support

FilesExpand file tree

vigenere_cipher.py

Latest commit

History

vigenere_cipher.py

File metadata and controls