Desklib Study Material Library: Solved Assignments, Essays, Dissertations

Contents
Chapter 2, Problem 2.7.c.......................................................................................................................3
1 - Chapter 3, Problem 3.2.....................................................................................................................3
2 - Chapter 3, Problem 3.3.....................................................................................................................4
2. A)......................................................................................................................................................4
2 B)........................................................................................................................................................5
3 - Chapter 3, Problem 3.5.....................................................................................................................5
3a).........................................................................................................................................................5
3b).........................................................................................................................................................6
Chapter 4, Problem 4.12........................................................................................................................6

Chapter 2, Problem 2.7.c
The given letter message = I leave thirty million dollars to my friendly cousin John
The letter message contains 48 letter and we have divide that letter for 4 X 4 matrix. So that
40 letter divide by 3 block and each block have 16 letters (4 x 4 matrix)
First 16 letter = I leave thirty mill
Round 1
The text arranged by row wise (4 x 4 matrix) and that text convert into number (a=0, b=1,
c=2, d=3 etc.)
I l e a
v e t h
i r t y
m i l l
8 11 4 0
21 4 19 7
8 17 19 24
12 8 11 11
Add the each column value and mod 26.
8 11 4 0
21 4 19 7
8 17 19 24
12 8 11 11
49 40 53 42
To calculate the module value

= 49 mod 26 = 23
= 40 mod 26 = 14
= 53 mod 26 = 1
= 42 mod 26 = 16
The running total is (23,14,1,16)
Round 2
Using round 1 matrix table and rotate the every column value. The first row value start from
second row value, the second row value start from third row value, the third row value start
from fourth row value and reverse the order for final row.
l e a I
t h v e
y i r t
l l i m
11 4 0 8
19 7 21 4
24 8 17 19
11 11 8 12
Again add the each column value.
11 4 0 8
19 7 21 4
24 8 17 19
11 11 8 12