Question 9
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Question 9
![C1 = a P1 +b P2 (mod 26)sla or
st
a1, a2,
knapsa
and a s
C2 = cP1 + d P2 (mod 26)
revealed that the most frequently occurring two-letter blocks were HO and PP, in the
order.
(a) Find the values of a, b, c, and d.
[Hint: The most common two-letter blocks in the English language are TH, followed
by HE.]
(b) What is the plaintext for the intercepted message PPIH HOG RAPVT?
9. Suppose that the message GO SOX is to be enciphered using Verman's telegraph cipher.
(a) Express the message in Baudot code.
(b) If the enciphering key is
where
TI
on the
knaps
0111010111101010100110010
is not
obtain the alphabetic form of the ciphertext.
10. A plaintext message expressed in Baudot code has been converted by the Verman cipher
into the string
has tv
110001110000111010100101111111
If it is known that the key used for encipherment was
and
011101011001011110001001101010
recover the message in its alphabetic form.
ficul](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F66c7b497-dac7-4855-b923-2e60bbc73063%2F48afc2c7-9ac8-47fb-a410-a6f72d5669a6%2F6ri2tki.jpeg&w=3840&q=75)
Transcribed Image Text:C1 = a P1 +b P2 (mod 26)sla or
st
a1, a2,
knapsa
and a s
C2 = cP1 + d P2 (mod 26)
revealed that the most frequently occurring two-letter blocks were HO and PP, in the
order.
(a) Find the values of a, b, c, and d.
[Hint: The most common two-letter blocks in the English language are TH, followed
by HE.]
(b) What is the plaintext for the intercepted message PPIH HOG RAPVT?
9. Suppose that the message GO SOX is to be enciphered using Verman's telegraph cipher.
(a) Express the message in Baudot code.
(b) If the enciphering key is
where
TI
on the
knaps
0111010111101010100110010
is not
obtain the alphabetic form of the ciphertext.
10. A plaintext message expressed in Baudot code has been converted by the Verman cipher
into the string
has tv
110001110000111010100101111111
If it is known that the key used for encipherment was
and
011101011001011110001001101010
recover the message in its alphabetic form.
ficul
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