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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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Transcribed Image Text:The United States Postal Service (USPS) sells money orders identified by an 11-digit number x,x ... x11. The first ten digits identify the money order;
X, is a check digit that satisfies x,1 = X, + X, + ... + X10 mod 9.
18.
Find the check digit for the USPS money orders that have identification number that start with these ten digits.
a) 7555618873
b) 6966133421
c) 8018927435
d) 3289744134
Transcribed Image Text:Encrypt the message DO NOT PASS GO by translating the letters into numbers, applying the given encryption function, and then translating
1.
the numbers back into letters.
a) fíp) = (p + 3) mod 26 (the Caesar cipher)
b) Ap) = (p + 13) mod 26
%3D
c) fſp) = (3p + 7) mod 26
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