# Python3 code to implement Hill Cipher
keyMatrix = [[0] * 3 for i in range(3)]
# Generate vector for the message
messageVector = [[0] for i in range(3)]
# Generate vector for the cipher
cipherMatrix = [[0] for i in range(3)]
# Following function generates the
# key matrix for the key string
def getKeyMatrix(key):
k = 0
for i in range(3):
for j in range(3):
keyMatrix[i][j] = ord(key[k]) % 65
k += 1
# Following function encrypts the message
def encrypt(messageVector):
for i in range(3):
for j in range(1):
cipherMatrix[i][j] = 0
for x in range(3):
cipherMatrix[i][j] += (keyMatrix[i][x] *
messageVector[x][j])
cipherMatrix[i][j] = cipherMatrix[i][j] % 26
def HillCipher(message, key):
# Get key matrix from the key string
getKeyMatrix(key)
# Generate vector for the message
for i in range(3):
messageVector[i][0] = ord(message[i]) % 65
# Following function generates
# the encrypted vector
encrypt(messageVector)
# Generate the encrypted text
# from the encrypted vector
CipherText = []
for i in range(3):
CipherText.append(chr(cipherMatrix[i][0] + 65))
# Finally print the ciphertext
print("Ciphertext: ", "".join(CipherText))
# Driver Code
def main():
# Get the message to
# be encrypted
message = "ACT"
# Get the key
key = "GYBNQKURP"
HillCipher(message, key)
if __name__ == "__main__":
main()
# This code is contributed
# by Pratik Somwanshi