mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-11-24 13:31:07 +00:00
121 lines
3.2 KiB
Python
121 lines
3.2 KiB
Python
# https://en.wikipedia.org/wiki/Trifid_cipher
|
|
|
|
|
|
def __encryptPart(messagePart, character2Number):
|
|
one, two, three = "", "", ""
|
|
tmp = []
|
|
|
|
for character in messagePart:
|
|
tmp.append(character2Number[character])
|
|
|
|
for each in tmp:
|
|
one += each[0]
|
|
two += each[1]
|
|
three += each[2]
|
|
|
|
return one + two + three
|
|
|
|
|
|
def __decryptPart(messagePart, character2Number):
|
|
tmp, thisPart = "", ""
|
|
result = []
|
|
|
|
for character in messagePart:
|
|
thisPart += character2Number[character]
|
|
|
|
for digit in thisPart:
|
|
tmp += digit
|
|
if len(tmp) == len(messagePart):
|
|
result.append(tmp)
|
|
tmp = ""
|
|
|
|
return result[0], result[1], result[2]
|
|
|
|
|
|
def __prepare(message, alphabet):
|
|
# Validate message and alphabet, set to upper and remove spaces
|
|
alphabet = alphabet.replace(" ", "").upper()
|
|
message = message.replace(" ", "").upper()
|
|
|
|
# Check length and characters
|
|
if len(alphabet) != 27:
|
|
raise KeyError("Length of alphabet has to be 27.")
|
|
for each in message:
|
|
if each not in alphabet:
|
|
raise ValueError("Each message character has to be included in alphabet!")
|
|
|
|
# Generate dictionares
|
|
numbers = (
|
|
"111",
|
|
"112",
|
|
"113",
|
|
"121",
|
|
"122",
|
|
"123",
|
|
"131",
|
|
"132",
|
|
"133",
|
|
"211",
|
|
"212",
|
|
"213",
|
|
"221",
|
|
"222",
|
|
"223",
|
|
"231",
|
|
"232",
|
|
"233",
|
|
"311",
|
|
"312",
|
|
"313",
|
|
"321",
|
|
"322",
|
|
"323",
|
|
"331",
|
|
"332",
|
|
"333",
|
|
)
|
|
character2Number = {}
|
|
number2Character = {}
|
|
for letter, number in zip(alphabet, numbers):
|
|
character2Number[letter] = number
|
|
number2Character[number] = letter
|
|
|
|
return message, alphabet, character2Number, number2Character
|
|
|
|
|
|
def encryptMessage(message, alphabet="ABCDEFGHIJKLMNOPQRSTUVWXYZ.", period=5):
|
|
message, alphabet, character2Number, number2Character = __prepare(message, alphabet)
|
|
encrypted, encrypted_numeric = "", ""
|
|
|
|
for i in range(0, len(message) + 1, period):
|
|
encrypted_numeric += __encryptPart(message[i : i + period], character2Number)
|
|
|
|
for i in range(0, len(encrypted_numeric), 3):
|
|
encrypted += number2Character[encrypted_numeric[i : i + 3]]
|
|
|
|
return encrypted
|
|
|
|
|
|
def decryptMessage(message, alphabet="ABCDEFGHIJKLMNOPQRSTUVWXYZ.", period=5):
|
|
message, alphabet, character2Number, number2Character = __prepare(message, alphabet)
|
|
decrypted_numeric = []
|
|
decrypted = ""
|
|
|
|
for i in range(0, len(message) + 1, period):
|
|
a, b, c = __decryptPart(message[i : i + period], character2Number)
|
|
|
|
for j in range(0, len(a)):
|
|
decrypted_numeric.append(a[j] + b[j] + c[j])
|
|
|
|
for each in decrypted_numeric:
|
|
decrypted += number2Character[each]
|
|
|
|
return decrypted
|
|
|
|
|
|
if __name__ == "__main__":
|
|
msg = "DEFEND THE EAST WALL OF THE CASTLE."
|
|
encrypted = encryptMessage(msg, "EPSDUCVWYM.ZLKXNBTFGORIJHAQ")
|
|
decrypted = decryptMessage(encrypted, "EPSDUCVWYM.ZLKXNBTFGORIJHAQ")
|
|
print(f"Encrypted: {encrypted}\nDecrypted: {decrypted}")
|