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Which of the following encryption methodologies works in a similar fashion to a running key cipher, with the difference being that the key is the length of plaintext and is used only once?
Running-key Cipher
One-time Pad
Monoalphabetic Cipher
Transposition Cipher
The correct answer is One-time Pad. A one-time pad is highly resistant to cryptanalysis and works like running key cipher except that the key is length of plaintext and is used only once.
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