hill_cipher.py

def hill(code): 
    decryptionKey = [[2,0,3],
                     [23,5,11],
                     [7,6,25]]
    
    code = code.lower()
    output = [[0],[0],[0]]
    counter = 0
    for character in code:
        number = ord(character) - 97
        output[counter][0] = number
        counter += 1

    result = [[0],
             [0],
             [0]]

    for i in range(len(decryptionKey)):
       for j in range(len(output[0])):
           for k in range(len(output)):
               result[i][0] += decryptionKey[i][k] * output[k][j]

    unCiphered = ""
    for r in result:
       numeric_letter = r[0] % 26
       val = chr(numeric_letter + 97)
       unCiphered = unCiphered + val

    return unCiphered

def main():
    code = raw_input("Enter ciphertext: ")
    print
    plaintext = ""

    while(code):
        ciphertext = code[:3]
        code = code[3:]
        plaintext = plaintext + hill(ciphertext)
        print plaintext
        print
                    
main()