Prob 1 7 For your convenience, the ciphertext in Problem 1 5 is given below NTCGPDOPANFLHJINTOOFITOVJHJCTMMHIHEMTCPFDWTSOFSHTOGFWTE TTJJTBTOOFSZOVEOCHCVCHPJHOCGTOHNQMTOCNTCGPDCGFCSTQMFBO FBGFSFBCTSHJCGTQMFHJCTYCXHCGFAHYTDDHAATSTJCBGFSFBCTSHJC GTBHQGTSCTYCCGHONTCGPDQSTOTSWTOCGTMTCCTSASTRVTJBZHJCGQ MFHJCTYCFJDOPPJTBFJOTFSBGAPSCGTQMFHJCTYCASPNFIHWTJBHQGT SCTYCEZBPNQFSHJICGTASTRVTJBZPATFBGMTCCTSFIFHJOCCGTLJPXJ BPNNPJASTRVTJBZHJCGTVJDTSMZHJIMFJIVFIT a T in the cipher text corresponds to E in the plain text b F in the cipher text corresponds to A in the plain text c H in the cipher text corresponds to I in the plain text d Suppose you have obtained a partial deciphered text in the first part of the cipher text as follows Methods of making messages unintelligible to adversaries have been necessary Substitution is the simplest method that replaces a character in the plaintext with a fixed different character in the ciphertext Then some the rest of the cipher text is This method preserves the letter frequency in the plaintext e All of the above f None of the above g a and c

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Prob. 1 . 7 . For your convenience, the ciphertext in Problem 1 . 5 is given below: NTCGPDOPANFLHJINTOOFITOVJHJCTMMHIHEMTCPFDWTSOFSHTOGFWTE TTJJTBTOOFSZOVEOCHCVCHPJHOCGTOHNQMTOCNTCGPDCGFCSTQMFBO FBGFSFBCTSHJCGTQMFHJCTYCXHCGFAHYTDDHAATSTJCBGFSFBCTSHJC GTBHQGTSCTYCCGHONTCGPDQSTOTSWTOCGTMTCCTSASTRVTJBZHJCGQ MFHJCTYCFJDOPPJTBFJOTFSBGAPSCGTQMFHJCTYCASPNFIHWTJBHQGT SCTYCEZBPNQFSHJICGTASTRVTJBZPATFBGMTCCTSFIFHJOCCGTLJPXJ BPNNPJASTRVTJBZHJCGTVJDTSMZHJIMFJIVFIT

Prob.

1.7 .

For your convenience, the ciphertext in Problem

1.5

is given below:

NTCGPDOPANFLHJINTOOFITOVJHJCTMMHIHEMTCPFDWTSOFSHTOGFWTE

TTJJTBTOOFSZOVEOCHCVCHPJHOCGTOHNQMTOCNTCGPDCGFCSTQMFBO

FBGFSFBCTSHJCGTQMFHJCTYCXHCGFAHYTDDHAATSTJCBGFSFBCTSHJC

GTBHQGTSCTYCCGHONTCGPDQSTOTSWTOCGTMTCCTSASTRVTJBZHJCGQ

MFHJCTYCFJDOPPJTBFJOTFSBGAPSCGTQMFHJCTYCASPNFIHWTJBHQGT

SCTYCEZBPNQFSHJICGTASTRVTJBZPATFBGMTCCTSFIFHJOCCGTLJPXJ

BPNNPJASTRVTJBZHJCGTVJDTSMZHJIMFJIVFIT

.

T in the cipher text corresponds to E in the plain text

.

F in the cipher text corresponds to A in the plain text

.

H in the cipher text corresponds to I in the plain text

.

Suppose you have obtained a partial deciphered text in the first part of the cipher text as follows: "Methods of making messages unintelligible to adversaries have been necessary. Substitution is the simplest method that replaces a character in the plaintext with a fixed different character in the ciphertext." Then some the rest of the cipher text is: "This method preserves the letter frequency in the plaintext"