Free Essay

Audi

In: Computers and Technology

Submitted By aditi9
Words 425
Pages 2
Dr. Liao

ITC 520, Fall 2015

Homework 3
(75 points)
Assigned:
Due:

Wednesday, November 4, 2015
5pm, Wednesday, November 18, 2015

Purpose
Practice on CIA and AAA.

Part A: Authentication (15 pts)
Consider the following authentication protocol for two parties to mutually authenticate to each other. Bob sends authentication request to Alice. Alice generates a random challenge message c, encrypts it with the key k that she shares with Bob, and sends the Ek (c) to Bob. Bob decrypts it, adds 1 to c, and sends Ek (c + 1) back to Alice. Alice decrypts the message and compares it with c.
If the difference is 1, Bob is authenticated. Simultaneously, Alice sends authentication request to
Bob, and Bob performs the same operation as described above to authenticate Alice in the same manner. Does the above mutual authentication secure? Why or why not?

Part B: Authorization (15 pts)
Suppose you are hired as a research assistant (RA) for Professor Liao. All RAs and Prof. Liao belong to the same group. On his Unix server, a directory called Research contain all research data and has the permission bits set as 730. There is one file under that directory called paper.tex owned by Prof. Liao and has the permission bits set as 644. Is it secure, and can anyone else other than Prof. Liao can modifier his paper? If you think it is not secure, include a step-bystep instruction on how to modify the file, and you must explain the underlying cause for such compromise. Part C: Authorization (15 pts)
Assume there are N job positions in an organization. For each job position i, there are Ui number of users. The number of permissions required for the job position is Pi . How many relationships between users and permissions must be defined for a) a DAC scheme and b) a RBAC scheme?

Part D: Authorization (15 pts)
A supermarket manager who badly needs cash can take money from the cash box since the manager has the authority to make any change to the cash register operated by a cashier. Show how RBAC can be used to govern the asset management and prevent a manager from taking money from the store. Dr. Liao

ITC 520, Fall 2015

Part E: Confidentiality vs. Integrity (15 pts)
Explain each and provide examples why yes or no.
1. Can a system provide confidentiality without integrity?
2. Can a system provide integrity without confidentiality?

What to Submit
Prepare your answers to homework in one PDF file on Blackboard before the due date.

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