CIS3360_HW4_solution-3-23-10

# CIS3360_HW4_solution-3-23-10 - CIS 3360 Security in...

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CIS 3360 – Security in Computing Spring 2010 Homework 4 (100 points) Due on 02/21/2010, 11:55 PM NOTE: Homework submitting instructions: (i) Acceptable file formats: .doc, .docx or .pdf file (ii) The file name should be yourlastname_yourfirstname_HW4 (iii)Include your Full Name and your PID at the top of your document. 1) [10] Permute the input 1110 0100 1001 1011, if a permutation is defined as follows: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 14 10 6 2 16 12 8 4 13 9 5 1 15 11 7 3 Answer:

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1 1 1 0 0 1 0 0 1 0 0 1 1 0 1 1 0 0 1 1 1 1 0 0 1 1 0 1 1 0 0 1 2) [10] Permute the input 1010 1100 1011 1101, if a permutation is defined as follows:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 4 2 3 1 8 6 7 5 12 10 11 9 16 14 15 13 Answer:

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1 0 1 0 1 1 0 0 1 0 1 1 1 1 0 1 0 0 1 1 0 1 0 1 1 0 1 1 1 1 0 1 3) [10] Given the following permutation, find the Caesar cipher equation and the Caesar cipher alphabet that has been used.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

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18 19 20 21 22 23 24 25 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Answer: Caesar cipher equation is c = E( p ) = ( p + 18 ) mod (26). Caesar cipher alphabet along with plain alphabet is given below: 0 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 2 5 a b c d e f g h i j k l m n o p q r s t u v w
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