It looks lengthy assignment based on definition and algorithms. Please find the attached document.

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Aditi · Accepted Answer

Problem 1
1. Substitution Cipher – Substitution cipher is a method in which each unit from the plaintext is substituted with the unit of ciphertext. The units may be single letters, pairs, triples or so on depending upon the agreeing terms.
Message Space  {∀c∈A}
Gen  It is an algorithm which generates the key to encrypt and decrypt the text.
Enc  It is an algorithm which means that if one message is encrypted multiple times, it may yields a different ciphertext every time.
Dec  It is an algorithm which means that whichever is the ciphertext, it will yield the correct message from it.
2. Frequency analysis from Figure 1:
JGRMQOYGHMVBJWRWQFPWHGFFDQGFPFZRKBEEBJIZQQOCIBZKLFAFGQVFZFWWEOGWOPFGFHWOLPHLRLOLFDMFGQWBLWBWQOLKFWBYLBLYLFSFLJGRMQBOLWJVFPFWQVHQWFFPQOQVFPQOCFPOGFWFJIGFQVHLHLROQVFGWJVFPFOLFHGQVQVFILEOGQILHQFQGIQVVOSFAFGBWQVHQWIJVWJVFPFWHGFIWIHZZRQGBABHZQOCGFHX
	Letters 
	Frequency
	Percentage
	A
	3
	1.22
	B
	12
	4.91
	C
	3
	1.22
	D
	2
	0.81
	E
	4
	1.63
	F
	37
	15.16
	G
	19
	7.78
	H
	14
	5.73
	I
	9
	3.68
	J
	9
	3.68
	K
	3
	1.22
	L
	17
	6.96
	M
	4
	1.63
	N
	0
	0
	O
	16
	6.55
	P
	10
	4.09
	Q
	26
	10.65
	R
	7
	2.86
	S
	2
	0.81
	T
	0
	0
	U
	0
	0
	V
	15
	6.14
	W
	21
	8.61
	X
	1
	0.41
	Y
	3
	1.22
	Z
	7
	2.

It looks lengthy assignment based on definition and algorithms. Please find the attached document.

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