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##### CHAPTER 2: CLASSICAL ENCRYPTION TECHNIQUES

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Question;1. __________ techniques map;plaintext elements (characters, bits) into ciphertext elements.;A);Transposition B);Substitution;C);Traditional D) Symmetric;2. 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);A) pascaline B) one-time pad;C) polycipher D) enigma;3. An original intelligible;message fed into the algorithm as input is known as _________, while the coded;message produced as output is called the __________.;A) decryption;encryption B) plaintext;ciphertext;C) deciphering;enciphering D) cipher;plaintext;4. Restoring the plaintext from the;ciphertext is __________.;A) deciphering B);transposition;C) steganography D);encryption;5. A __________ attack involves;trying every possible key until an intelligible translation of the ciphertext;is obtained.;A) brute-force B) Caesar;attack;C) ciphertext only D) chosen plaintext;6. Techniques used for deciphering;a message without any knowledge of the enciphering details is ___________.;A) blind deciphering B);steganography;C) cryptanalysis D) transposition;7. The ___________ takes the;ciphertext and the secret key and produces the original plaintext. It is essentially;the encryption algorithm run in reverse.;A) Voronoi algorithm B) decryption algorithm;C) cryptanalysis D) diagram;algorithm;8. If both sender and receiver use;the same key, the system is referred to as;A) public-key encryption;B) two-key;C) asymmetric D);conventional encryption

Paper#55156 | Written in 18-Jul-2015

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