Descripción: método gráfico de programación entera
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Descripción: mata vela
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Assignment 3
Cryptography
Submit a hard copy of assignment on coming Thursday.
There are some difficulties in the Assignment 3 of cryptography, hence some changes in the previous assignment are as follows:
The previous question in which there was “sherlock holmes” and “DOUGLAS” “BRISTLONE”, has been discarded. No need to attempt that question. Attempt the remaining 3 question of previous assignment, in addition to below mentioned. More questions are: 1.
Constr nstru uct a pl playfai fair ma matrix wi with th the ke key “largest”
2. Cons onstruc tructt the the play playfa fair ir matr atrix with with the the key key “occurence”. Make a reasonable assumption about how to treat redundant letters in the key.
3.
Using th the pl playfair ma matrix
M
F
H
I/ J
K
U
N
O
P
Q
Z
V
W
X
Y
E
L
A
R
G
D
S
T
B
C
ENCRYPT the message: “Must see you over Cadogan west. Coming at once”. 4.
Usin Using g the the vige vigener neree cip ciphe her, r, encry encrypt pt the wo word rd “expl “explan anat ation ion” ” usi using ng the the key key leg
Hint regarding decryption question that was full of symbols and numbers:
You dont need to decrypt the message. Just need to tell/map what symbol is used for what character? After decryption, the plaintext is given below. Here is the plaintext:
A good glass in the Bishop's hostel in the Devil's seat—twenty-one degrees and thirteen minutes—northeast and by north—main branch seventh limb east side— shoot from the left eye of the death's head— a bee line from the tree through the shot fifty feet out.