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NEW QUESTION 37 A transposition cipher invented 1918 by Fritz Nebel, used a 36 letter alphabet and a modified Polybius square with a single columnar transposition.

• A. ADFVGX Cipher
• B. Cipher Disk
• C. Book Ciphers
• D. ROT13 Cipher

Answer: A Explanation: ADFVGX Cipher https://en.wikipedia.org/wiki/ADFGVX_cipher ADFGVX cipher was a field cipher used by the German Army on the Western Front during World War I. ADFGVX was in fact an extension of an earlier cipher called ADFGX. Invented by Lieutenant Fritz Nebel (1891-1977) and introduced in March 1918, the cipher was a fractionating transposition cipher which combined a modified Polybius square with a single columnar transposition. Incorrect answers: Book Ciphers - or Ottendorf cipher, is a cipher in which the key is some aspect of a book or other piece of text. Books, being common and widely available in modern times, are more convenient for this use than objects made specifically for cryptographic purposes. It is typically essential that both correspondents not only have the same book, but the same edition. Cipher Disk - enciphering and deciphering tool developed in 1470 by the Italian architect and author Leon Battista Alberti. He constructed a device, (eponymously called the Alberti cipher disk) consisting of two concentric circular plates mounted one on top of the other. The larger plate is called the "stationary" and the smaller one the "moveable" since the smaller one could move on top of the "stationary" ROT13 Cipher - simple letter substitution cipher that replaces a letter with the 13th letter after it, in the alphabet. ROT13 is a special case of the Caesar cipher which was developed in ancient Rome.   NEW QUESTION 38 Ciphers that write message letters out diagonally over a number of rows then read off cipher row by row. Also called zig-zag cipher.

• A. Null Cipher
• B. Rail Fence Cipher
• C. Vigenere Cipher
• D. ROT-13

Answer: B Explanation: Rail Fence Cipher https://en.wikipedia.org/wiki/Railfencecipher The rail fence cipher (also called a zigzag cipher) is a form of transposition cipher. It derives its name from the way in which it is encoded. Incorrect answers: Null cipher - also known as concealment cipher, is an ancient form of encryption where the plaintext is mixed with a large amount of non-cipher material. Today it is regarded as a simple form of steganography, which can be used to hide ciphertext. Vigenere cipher - is a method of encrypting alphabetic text by using a series of interwoven Caesar ciphers, based on the letters of a keyword. It employs a form of polyalphabetic substitution. ROT13 - ("rotate by 13 places", sometimes hyphenated ROT-13) is a simple letter substitution cipher that replaces a letter with the 13th letter after it, in the alphabet. ROT13 is a special case of the Caesar cipher which was developed in ancient Rome.   NEW QUESTION 39 With Electronic codebook (ECB) what happens:

• A. The cipher text from the current round is XORed with the plaintext for the next round
• B. The message is divided into blocks and each block is encrypted separately. This is the most basic mode for symmetric encryption
• C. The cipher text from the current round is XORed with the plaintext from the previous round
• D. The block cipher is turned into a stream cipher

Answer: B Explanation: The message is divided into blocks and each block is encrypted separately. This is the most basic mode for symmetric encryption https://en.wikipedia.org/wiki/Blockciphermodeofoperation#Electroniccodebook(ECB) The simplest of the encryption modes is the electronic codebook (ECB) mode (named after conventional physical codebooks). The message is divided into blocks, and each block is encrypted separately.   NEW QUESTION 40 ......