Question: The Shift Cipher does not provide perfect secrecy because it fails two essential conditions. First, perfect secrecy requires a key space at least as large

The Shift Cipher does not provide perfect secrecy because it fails two essential conditions. First, perfect secrecy requires a key space at least as large as the message space, but the Shift Cipher has only

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possible keys, which is inadequate to cover all message variations, especially for longer messages.

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