Circle the right answer. MCQs may have more than one answer. For T/F the answer

Question

Circle the right answer. MCQs may have more than one answer. For T/F the answer is True, write "None in Justify/Correct. If the answer is False, provide the right answer/justification in Justify/Correct part. questions, if 1. Transpositions refer to common two-letter combinations in the English language. l point) a) True b) False Justify/Correct 2. A cipher where the message is written in a rectangle, row by row, and read off, column by column, while permuting the order of the columns is known as the (I point) a) Playfair cipher b) Vigenère cipher c) Rail Fence Cipher d) None of the above 3. Rail Fence Cipher is cipher where the plaintext is written down as a sequence of diagonals and then read off as a sequence of rows. a) True b) False (I point) Justify/Correct 4. Cryptology is the methods of concealing the existence of the message in a graphic image. (I point) a) True b) False Justify/Correct 5. A block cipher processes the input one block of elements at a time, producing an output cipher processes the input elements (I point) block for each input block, whereas a continuously, and producing output one element at a time 6. The earliest known, and simplest use, of a substitution cipher was called the cipher and involved replacing further down the alphabet. each letter of the alphabet with the letter standing three places (1 point) NET-413/SWs-421-Canadian University Dubai-Summer 2018 Page 2

Explanation / Answer

Question 1

False

Diagrams refer to common two-letter combinations in the English language.

Question 2

d.None of the above

Transposition cipher where the message is written in a rectangle row by row and read off columns by column while permuting the order of the columns is known as the

Question 3

True

To encrypt a message by using the technique of Rail Fence Cipher the message is written in a zig zag rows and then it is reach of each row.

Question 4

False

Steganography is the methods of concealing the existence of the message in a graphic image.

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