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121 lines
3.2 KiB
Python
121 lines
3.2 KiB
Python
# https://en.wikipedia.org/wiki/Trifid_cipher
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def __encryptPart(messagePart, character2Number):
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one, two, three = "", "", ""
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tmp = []
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for character in messagePart:
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tmp.append(character2Number[character])
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for each in tmp:
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one += each[0]
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two += each[1]
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three += each[2]
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return one + two + three
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def __decryptPart(messagePart, character2Number):
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tmp, thisPart = "", ""
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result = []
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for character in messagePart:
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thisPart += character2Number[character]
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for digit in thisPart:
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tmp += digit
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if len(tmp) == len(messagePart):
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result.append(tmp)
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tmp = ""
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return result[0], result[1], result[2]
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def __prepare(message, alphabet):
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# Validate message and alphabet, set to upper and remove spaces
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alphabet = alphabet.replace(" ", "").upper()
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message = message.replace(" ", "").upper()
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# Check length and characters
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if len(alphabet) != 27:
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raise KeyError("Length of alphabet has to be 27.")
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for each in message:
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if each not in alphabet:
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raise ValueError("Each message character has to be included in alphabet!")
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# Generate dictionares
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numbers = (
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"111",
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"112",
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"113",
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"121",
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"122",
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"123",
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"131",
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"132",
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"133",
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"211",
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"212",
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"213",
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"221",
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"222",
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"223",
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"231",
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"232",
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"233",
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"311",
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"312",
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"313",
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"321",
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"322",
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"323",
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"331",
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"332",
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"333",
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)
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character2Number = {}
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number2Character = {}
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for letter, number in zip(alphabet, numbers):
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character2Number[letter] = number
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number2Character[number] = letter
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return message, alphabet, character2Number, number2Character
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def encryptMessage(message, alphabet="ABCDEFGHIJKLMNOPQRSTUVWXYZ.", period=5):
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message, alphabet, character2Number, number2Character = __prepare(message, alphabet)
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encrypted, encrypted_numeric = "", ""
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for i in range(0, len(message) + 1, period):
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encrypted_numeric += __encryptPart(message[i : i + period], character2Number)
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for i in range(0, len(encrypted_numeric), 3):
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encrypted += number2Character[encrypted_numeric[i : i + 3]]
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return encrypted
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def decryptMessage(message, alphabet="ABCDEFGHIJKLMNOPQRSTUVWXYZ.", period=5):
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message, alphabet, character2Number, number2Character = __prepare(message, alphabet)
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decrypted_numeric = []
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decrypted = ""
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for i in range(0, len(message) + 1, period):
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a, b, c = __decryptPart(message[i : i + period], character2Number)
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for j in range(0, len(a)):
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decrypted_numeric.append(a[j] + b[j] + c[j])
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for each in decrypted_numeric:
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decrypted += number2Character[each]
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return decrypted
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if __name__ == "__main__":
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msg = "DEFEND THE EAST WALL OF THE CASTLE."
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encrypted = encryptMessage(msg, "EPSDUCVWYM.ZLKXNBTFGORIJHAQ")
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decrypted = decryptMessage(encrypted, "EPSDUCVWYM.ZLKXNBTFGORIJHAQ")
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print(f"Encrypted: {encrypted}\nDecrypted: {decrypted}")
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