The running key cipher is known as the one-time pad and uses a set of characters for encryption operations only once.

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The running key cipher is a type of polyalphabetic cipher that uses a key consisting of a sequence of characters that are repeated over and over again to encrypt the plaintext message. It is not a one-time pad as the running key can be used multiple times for encryption. The one-time pad is a type of encryption technique that uses a random key that is only used once for encryption and then discarded.

The Running Key Cipher Is Known as the One-Time Pad