def e_vigenere1(plaintext, key):
# your code here
square = utilities_A2.get_vigenereSquare()
ciphertext = ''
for char in plaintext:
if char.lower() in square[0]:
plainIndx = square[0].index(char.lower())
keyIndx = square[0].index(key)
cipherChar = square[keyIndx][plainIndx]
ciphertext += cipherChar.upper() if char.isupper() else cipherChar
else:
ciphertext += char
return ciphertext
def e_vigenere2(plaintext, key):
square = utilities_A2.get_vigenereSquare()
ciphertext = ''
counter = 0
for char in plaintext:
if char.lower() in square[0]:
plainIndex = square[0].index(char.lower())
keyIndex = square[0].index(key[counter % len(key)])
cipherChar = square[keyIndex][plainIndex]
ciphertext += cipherChar.upper() if char.isupper() else cipherChar
counter += 1
else:
ciphertext += char
return ciphertext
def d_vigenere1(ciphertext, key):
square = utilities_A2.get_vigenereSquare()
plaintext = ''
for char in ciphertext:
if char.lower() in square[0]:
keyIndex = square[0].index(key)
plainIndex = 0
for i in range(26):
if square[i][keyIndex] == char.lower():
plainIndex = i
break
plainChar = square[0][plainIndex]
key = plainChar
plaintext += plainChar.upper() if char.isupper() else plainChar
else:
plaintext += char
return plaintext
def d_vigenere2(ciphertext, key):
# your code here
square = utilities_A2.get_vigenereSquare()
plaintext = ''
count = 0
for char in ciphertext:
if char.lower() in square[0]:
keyIndx = square[0].index(key[count % len(key)])
count += 1
plainIndx = 0
for i in range(26):
if square[i][keyIndx] == char.lower():
plainIndx = i
break
plainChar = square[0][plainIndx]
plaintext += plainChar.upper() if char.isupper() else plainChar
else:
plaintext += char
return plaintext
