Hill 암호 [ 힐 암호, 암호 ]

import random
class HiLL:
    def __init__(self):
        self.MatrixKey = [[1, 1], [0, 1]]
        '''
            1    2
            0    1    1 mod (26) == 1  27
        '''
        self.ReverseKey = [[27, -1], [0, 1]]
        '''
            27   1
            0    1
        '''
        self.PlainText_str = ""
        self.CipherText_str = ""
        self.DecryptText_str = ""
        self.FieldList = []
        self.TempLength = 0

    def FiledSetting(self):
        self.FieldList.extend([chr(Ascii) for Ascii in range(ord('A'), ord('Z')+1)])

    def DeterminantTest(self):
        D1 = self.MatrixKey[0][0] * self.MatrixKey[1][1] -\
             self.MatrixKey[0][1] * self.MatrixKey[1][0]

        D2 = self.ReverseKey[0][0] * self.ReverseKey[1][1] - \
             self.ReverseKey[0][1] * self.ReverseKey[1][0]


        if (D1*D2)%len(self.FieldList) == 1:
            print ("Test OK ... !!!")
        else:
            print ("Ooopse .... !!!")

    def WritePlainText(self):
        self.PlainText_str = input("PlainText : ")
        if (len(self.PlainText_str)%2 != 0):
            self.TempLength = int(len(self.PlainText_str)%2)
            for i in range(0, self.TempLength):
                RandomIndx = random.randint(0, len(self.FieldList))
                self.PlainText_str = self.PlainText_str + self.FieldList[RandomIndx]
        print ("plainText is {}".format(self.PlainText_str))

    def EncrytHiLL(self):
        L = []
        for i in range(0, len(self.PlainText_str), 2):
            L.append(self.PlainText_str[i:i+2])
            v1 = self.FieldList.index(L[0][0])
            v2 = self.FieldList.index(L[0][1])
            """
             i = 0 => [0:2]
             i = 1 => [2:4]
            """
            R1 = ((self.MatrixKey[0][0] * v1) + (self.MatrixKey[0][1] * v2))%len(self.FieldList)
            R2 = ((self.MatrixKey[1][0] * v1) + (self.MatrixKey[1][1] * v2))%len(self.FieldList)
            Ch1 = self.FieldList[R1]
            Ch2 = self.FieldList[R2]

            self.CipherText_str += Ch1
            self.CipherText_str += Ch2
            L = []
        print ("self.CipherText_str => {cipher}".format(cipher = self.CipherText_str))

    def DecryptHiLL(self):
        L = []
        for i in range(0, len(self.CipherText_str), 2):
            L.append(self.CipherText_str[i:i+2])
            v1 = self.FieldList.index(L[0][0])
            v2 = self.FieldList.index(L[0][1])
            """
             i = 0 => [0:2]
             i = 1 => [2:4]
            """
            R1 = ((self.ReverseKey[0][0] * v1) + (self.ReverseKey[0][1] * v2))%len(self.FieldList)
            R2 = ((self.ReverseKey[1][0] * v1) + (self.ReverseKey[1][1] * v2))%len(self.FieldList)
            Ch1 = self.FieldList[R1]
            Ch2 = self.FieldList[R2]

            self.DecryptText_str += Ch1
            self.DecryptText_str += Ch2
            L = []
        print ("self.CipherText_str => {Decrypt}".format(Decrypt = self.DecryptText_str))

def main():
    H = HiLL() # Instance create2
    H.FiledSetting()
    H.DeterminantTest()
    H.WritePlainText()
    H.EncrytHiLL()
    H.DecryptHiLL()
if __name__ == "__main__":
    main()