One encryption method made popular by spy movies involves using the text in a book as the key to decrypt a message.

Name: One encryption method made popular by spy movies involves using the text in a book as the key to decrypt a message.
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This encryption method, known as a "book cipher," involves using a specific book as the key to encrypt and decrypt messages. It was commonly used by spies and secret agents in the past.

One Encryption Method Made Popular by Spy Movies Involves Using