(15 marks) The following is a quotation encrypted using substitution. Find the substitution key, and decrypt...
(15 marks) The following is a quotation encrypted using substitution. Find the substitution key, and decrypt the encrypted quotation. In addition to the decrypted plain text, you must also show how you found the key.
| gahzh | zgaff | irfcc | fqgmx | eefsp | xmgab | bxscy | gadgb | afqbf | dsfzh |
| rvhqm | xsgnq | fxmgf | qgafz | nsmfh | gxmxn | sxbqk | faduh | xnsbf | jdvft |
| nhcgp | xmxns | yhzdz | gfszg | afznq | gafjx | xqdqy | gafzg | dszdz | hmbfb |
| fsfuh | ccdhq | zkpqf | rfzzh | gpmxx | czkpa | fdufq | cprxj | enczh | xq |
Homework Answers
You can follow two methods-
a) Perform Frequency Analysis:
Check the frequency of each letter occurring in the cipher text and
compare it with the frequency of letters in English language to get
some initial plain text letters.
b) Perform digram and
trigram analysis: Compare all the frequently
occurring digrams and trigrams to the frequency of digrams and
trigrams in English language to get some more plain text
letters.
c) Use intuition and knowledge of English language to guess the
other letters.
Decrypted Text:
This is the excellent foppery of the world, that, when we are sick
in fortune – often the surfeit of our own behavior – we make guilty
of our disasters the sun, the moon, and the stars; as if we were
villains by necessity, fools by heavenly compulsion.
Substitution Key:
dkryfmtahovcjqxelszgnubipw
|
A ? D |
B ? K |
C ? R |
D ? Y |
E ? F |
F ? M |
G ? T |
H ? A |
I ? H |
J ? O |
K ? V |
L ? C |
M ? J |
N ? Q |
O ? X |
P ? E |
Q ? L |
R ? S |
S ? Z |
T ? G |
U ? N |
V ? U |
W ? B |
X ? I |
Y ? P |
Z ? W |
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