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Szyfr Trithemius"a

Opis problemu

Szyfrowanie

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def encrypt_trithemius(message: str) -> bool:
    encrypted = ""
    k = 0

    for letter in message:
        encrypted_letter = ord(letter) + k

        if encrypted_letter > ord("z"):
            encrypted_letter = ord("a") + encrypted_letter - ord("z")

        encrypted += chr(encrypted_letter)
        k += 1
        k %= 26

    return encrypted

message = "computerscience"

encrypted = encrypt_trithemius(message)

print(encrypted)

Deszyfrowanie

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def decrypt_trithemius(message: str) -> str:
    decrypted = ""
    k = 0

    for letter in message:   
        decrypted_letter = ord(letter) - k

        if decrypted_letter < ord("a"):
            decrypted_letter = ord("z") - (ord("a") - decrypted_letter)

        decrypted += chr(decrypted_letter)
        k += 1
        k %= 26

    return decrypted

message = "cposyykyblspzps"

decrypted = decrypt_trithemius(message)

print(decrypted)