## Cryptography and Network Security

Computing

## Quiz 3 :

Classical Encryption Techniques

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Q17 Q17 Q17

Joseph Mauborgne proposed an improvement to the Vernam cipher that uses a random key that is as long as the message so that the key does not need to be repeated.the key is used to encrypt and decrypt a single message and then is discarded.Each new message requires a new key of the same length as the new message.this scheme is known as a(n) __________ .

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Multiple Choice

Q37 Q37 Q37

One of the simplest and best known polyalphabetic ciphers is _________ cipher.In this scheme, the set of related monoalphabetic substitution rules consists of the 26 Caesar ciphers with shifts of 0 through 25.Each cipher is denoted by a key letter which is the ciphertext letter that substitutes for the plaintext letter
A.

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