Cryptography and Network Security
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) __________ .
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.