Cryptographic_Algorithms/Atbash Cipher.py at main · Arkantos-13/Cryptographic_Algorithms · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
"""
Here are  two alphabets, both English and Greek
"""

Alphabet = "ABCDEFGHIJKLMNOPQRSTUWXYZΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨΩ"
AlphabetRVS = "ZYXWUTSRQPONMLKJIHGFEDCBAΩΨΧΦΥΤΣΡΠΟΞΝΜΛΚΙΘΗΖΕΔΓΒΑ"


'''
User's message
'''

message = input("Enter your message:").upper()


def encryption():

    encryption_text = ''

    '''
    Convert Alphabet to Alphabet reversed,space included.
    '''

    for i in range(len(message)):
        if message[i] == chr(32):
            encryption_text += " "
        else:
            for j in range(len(Alphabet)):
                if message[i] == Alphabet[j]:
                    encryption_text += AlphabetRVS[j]
                    break
    print("Encrypted message: {}".format(encryption_text))

def decryption():

    dencryption_text = ''

    '''
    Convert Alphabet reversed to Alphabet ,space included.
    '''

    for i in range(len(message)):
        if message[i] == chr(32):
            dencryption_text += " "
        else:
            for j in range(len(AlphabetRVS)):
                if message[i] == AlphabetRVS[j]:
                    dencryption_text += Alphabet[j]
                    break
    print("Decrypted message: {}".format(dencryption_text))


def main():

    '''
    User's choice for encryption or decryption.
    '''

    choice = int(input("Please enter:\n 1:for encryption\n 2:for decryption \n"))

    if choice == 1:
        print("---Encryption---")
        encryption()
    elif choice == 2:
        print("---Decryption---")
        decryption()
    else:
        print("Wrong choice. Try again!")


if __name__ == '__main__':
    main()