Consider a cryptosystem where the user enters a key in the form of a password. a. Assume a password consists of 10 characters , where each one is encoded using the ASCII scheme (7 bits per character). What is the size of the key space? b. What is the corresponding key length in bits? c. Assume that most users use 26 letters (lower and upper case) from the alphabet, what is the corresponding key length in bits in this case? d. At least how many characters are required for a password in order to generate a key length of 192 bits in case of letters consisting of (i). 7- bit characters? (ii). 26 lowercase letters from the alphabet?
Consider a cryptosystem where the user enters a key in the form of a password. a. Assume a password consists of 10 characters , where each one is encoded using the ASCII scheme (7 bits per character). What is the size of the key space? b. What is the corresponding key length in bits? c. Assume that most users use 26 letters (lower and upper case) from the alphabet, what is the corresponding key length in bits in this case? d. At least how many characters are required for a password in order to generate a key length of 192 bits in case of letters consisting of (i). 7- bit characters? (ii). 26 lowercase letters from the alphabet?
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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Consider a cryptosystem where the user enters a key in the form of a password.
a. Assume a password consists of 10 characters , where each one is encoded using the
ASCII scheme (7 bits per character). What is the size of the key space?
b. What is the corresponding key length in bits?
c. Assume that most users use 26 letters (lower and upper case) from the alphabet, what is
the corresponding key length in bits in this case?
d. At least how many characters are required for a password in order to generate a key
length of 192 bits in case of letters consisting of
(i). 7- bit characters?
(ii). 26 lowercase letters from the alphabet?
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