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1. Determine the entropy associated with the following method of generating a password. Choose, and place in this order, one lower case letter, following by one upper case letter, followed by two digits, followed by @, followed by two letters, each upper or lower case, and then followed by three symbols drawn from the set {$,9,5,v,w,J}. Finally, apply the hash function Tiger to give an output string in hex which will be used as a password. Assume random choices are made with equal likelihood of each symbol from the space being chosen from. So for a random digit there are 10 possibilities, each chosen with probability 1/10.

1. Determine the entropy associated with the following method of generating a password. Choose, and place in this order, one lower case letter, following by one upper case letter, followed by two digits, followed by @, followed by two letters, each upper or lower case, and then followed by three symbols drawn from the set {$,9,5,v,w,J}. Finally, apply the hash function Tiger to give an output string in hex which will be used as a password. Assume random choices are made with equal likelihood of each symbol from the space being chosen from. So for a random digit there are 10 possibilities, each chosen with probability 1/10.

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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1. Determine the entropy associated with the following method of generating a password. Choose, and place in this order, one lower case letter, following by one upper case letter, followed by two digits, followed by @, followed by two letters, each upper or lower case, and then followed by three symbols drawn from the set {$,9,5,v,w,J}. Finally, apply the hash function Tiger to give an output string in hex which will be used as a password. Assume random choices are made with equal likelihood of each symbol from the space being chosen from. So for a random digit there are 10 possibilities, each chosen with probability 1/10. 2. Generate a BLP lattice structured system where the objects and subjects are appropriately levelled to give access consistent with the access control matrix below. You need to describe the process by which you obtain your lattice. R and W correspond, respectively, to read and append. You are to use only the mandatory BLP rules, and a default allow in place of the discretionary rule. Be sure to add a level as necssary to ensure this is a lattice. 0₁ 0₂ S₁ R S₂ R S3 R RW S₁ R S5 R S6 R R R 03 04 05 06 R R RW W R R RW R W W R Alice can climb trees and eat apples. Bob can climb fences, eat apples, and wave flags. Trees can hurt apples. Carol can jump waves and wave flags. W W W 3. For the following collection of statements, describe the sets of actions, objects, and subjects; and draw an access control matrix to represent the scenario.
Transcribed Image Text:1. Determine the entropy associated with the following method of generating a password. Choose, and place in this order, one lower case letter, following by one upper case letter, followed by two digits, followed by @, followed by two letters, each upper or lower case, and then followed by three symbols drawn from the set {$,9,5,v,w,J}. Finally, apply the hash function Tiger to give an output string in hex which will be used as a password. Assume random choices are made with equal likelihood of each symbol from the space being chosen from. So for a random digit there are 10 possibilities, each chosen with probability 1/10. 2. Generate a BLP lattice structured system where the objects and subjects are appropriately levelled to give access consistent with the access control matrix below. You need to describe the process by which you obtain your lattice. R and W correspond, respectively, to read and append. You are to use only the mandatory BLP rules, and a default allow in place of the discretionary rule. Be sure to add a level as necssary to ensure this is a lattice. 0₁ 0₂ S₁ R S₂ R S3 R RW S₁ R S5 R S6 R R R 03 04 05 06 R R RW W R R RW R W W R Alice can climb trees and eat apples. Bob can climb fences, eat apples, and wave flags. Trees can hurt apples. Carol can jump waves and wave flags. W W W 3. For the following collection of statements, describe the sets of actions, objects, and subjects; and draw an access control matrix to represent the scenario.
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