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Add running key cipher #10834
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Add running key cipher #10834
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960ff5d
Add running key cipher
ArshdeepSingh98 0de53b9
update running key cipher add doctests and hints
ArshdeepSingh98 1bf84c4
Add test case
ArshdeepSingh98 ed55cfc
Update return value
ArshdeepSingh98 d41b9da
range(len()) is almost always a hint to use enumerate()
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def running_key_encrypt(key: str, plaintext: str) -> str: | ||
""" | ||
Encrypts the plaintext using the Running Key Cipher. | ||
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:param key: The running key (long piece of text). | ||
:param plaintext: The plaintext to be encrypted. | ||
:return: The ciphertext. | ||
""" | ||
plaintext = plaintext.replace(" ", "").upper() | ||
key = key.replace(" ", "").upper() | ||
key_length = len(key) | ||
ciphertext = [] | ||
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for i in range(len(plaintext)): | ||
p = ord(plaintext[i]) - ord("A") | ||
k = ord(key[i % key_length]) - ord("A") | ||
c = (p + k) % 26 | ||
ciphertext.append(chr(c + ord("A"))) | ||
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return "".join(ciphertext) | ||
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def running_key_decrypt(key: str, ciphertext: str) -> str: | ||
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""" | ||
Decrypts the ciphertext using the Running Key Cipher. | ||
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:param key: The running key (long piece of text). | ||
:param ciphertext: The ciphertext to be decrypted. | ||
:return: The plaintext. | ||
""" | ||
ciphertext = ciphertext.replace(" ", "").upper() | ||
key = key.replace(" ", "").upper() | ||
key_length = len(key) | ||
plaintext = [] | ||
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for i in range(len(ciphertext)): | ||
c = ord(ciphertext[i]) - ord("A") | ||
k = ord(key[i % key_length]) - ord("A") | ||
p = (c - k) % 26 | ||
plaintext.append(chr(p + ord("A"))) | ||
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return "".join(plaintext) | ||
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def test_running_key_encrypt(): | ||
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""" | ||
>>> key = "How does the duck know that? said Victor" | ||
>>> plaintext = "DEFEND THIS" | ||
>>> ciphertext = running_key_encrypt(key, plaintext) | ||
>>> decrypted_text = running_key_decrypt(key, ciphertext) | ||
>>> decrypted_text == "DEFENDTHIS" | ||
True | ||
""" | ||
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if __name__ == "__main__": | ||
import doctest | ||
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doctest.testmod() | ||
test_running_key_encrypt() | ||
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key = "How does the duck know that? said Victor" | ||
plaintext = input("Enter the plaintext: ").upper() | ||
encrypted_text = running_key_encrypt(key, plaintext) | ||
decrypted_text = running_key_decrypt(key, encrypted_text) | ||
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print("\nPlaintext:", plaintext) | ||
print("Encrypted:", encrypted_text) | ||
print("Decrypted:", decrypted_text) |
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