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Which of the following encryption methodologies works like a running-key cipher, except that the key is the length of plaintext and is used only once?
Monoalphabetic cipher
Transposition cipher
A one-time pad
Running-key cipher
A one-time pad is highly resistant to cryptanalysis and works like a running-key cipher, except that the key is the length of plaintext and is used only once. EDIT: The running key cipher is a type of polyalphabetic substitution cipher in which a text, typically from a book, is used to provide a very long keystream. Usually, the book to be used would be agreed ahead of time, while the passage to be used would be chosen randomly for each message and secretly indicated somewhere in the message. Source: https://en.wikipedia.org/wiki/Runningkeycipher
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