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Engineering
Computer Engineering
A password is 4 characters in length,

A password is 4 characters in length,

Computer Networking: A Top-Down Approach (7th Edition)
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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Assume: - A password is 4 characters in length, and there 12 different characters from which we can select. - The password file includes 64 passwords, an attacker has a dictionary of 128000 common passwords, and the probability of having a password from password file in the dictionary is 0.2. - Work is defined as number of computed hashes. - Work time = 3xWork seconds. Example: Work = 10 hashes, then Work time = 3x10 = 30 seconds. What is the expected number of hours needed to find the password for a specific user if salts are used and dictionary is used? O 35.307 O 13.973 O 8.640 O Answer not given O 17.579
Transcribed Image Text:Assume: - A password is 4 characters in length, and there 12 different characters from which we can select. - The password file includes 64 passwords, an attacker has a dictionary of 128000 common passwords, and the probability of having a password from password file in the dictionary is 0.2. - Work is defined as number of computed hashes. - Work time = 3xWork seconds. Example: Work = 10 hashes, then Work time = 3x10 = 30 seconds. What is the expected number of hours needed to find the password for a specific user if salts are used and dictionary is used? O 35.307 O 13.973 O 8.640 O Answer not given O 17.579
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