Re: CS315 Assignment 1 Solution and Discussion
Assignment No. 01
Semester: Spring 2020
Network Security-CS315 Total Marks: 20
Due Date: 29-May, 2020
Instructions:
Please read the following instructions carefully before submitting assignment:
You need to use MS word document to prepare and submit the assignment on VU-LMS.
It should be clear that your assignment will not get any credit if:
The assignment is submitted after due date.
The assignment is not in the required format (doc or docx).
The submitted assignment does not open or file is corrupt.
Assignment is copied (partial or full) from any source (websites, forums, students, etc).
Objectives:
To enhance the learning capabilities of students about Network Security Requirements and Algorithms.
Assignment
Question 1: Marks 14
Carefully analyze the scenarios/problems mentioned below and suggest the most suitable security requirements that should be fulfilled by the organizations to overcome their respective problem(s).
ABC Bank is providing credit card services to its clients. One of its clients Mr. Amir lost his credit card and he received an email of credit card transaction from the bank.
XYZ Soft wants to check that which employee has accessed their system after office working hours but it is unable to trace the employee because organization don’t keep any system logs.
ITC University is providing access to its students of their results through online portal but one of its students is executing scripts to access the server again and again that causes the server to get down.
A student takes admission in the university. After a year, university found that student’s actual information is not matching with the information entered in the university’s database.
A doctor in a hospital detected that one of its patient’s information has been altered by one of the medical staff who was not authorized to access that information.
Glass Soft is providing online gaming facility to end users but one of its employees leaked the information and now users getting spam messages.
Chatbot organization is providing online chatting services to its users. It’s two users A and B are chatting with each other while some user C is sending message to A while pretending that it’s B.
Question 2: Marks 06
Given tables contain the combinations of Plain text, Cipher text and Key Stream. You are required to discover Cipher text and Key stream in binary form while Plain text in decimal form with the help of stream cipher algorithm using following data:
a) Given plain text and key stream. Discover Cipher Text (binary).
Plain Text
Key Stream
Cipher Text
01010111
11011101
?
b) Given cipher text and key stream. Discover Plain Text (decimal).
Cipher Text
Key Stream
Plain Text
011011101
101110110
?
c) Given plain text and cipher text. Discover Key Stream(binary).
Plain Text
Cipher Text
Key Stream
101110110
011010101
?
Assignment No. 03
Semester: Fall 2019
Network Security-CS315 Total Marks: 20
Due Date: 23-Jan-2020
Instructions:
Please read the following instructions carefully before submitting assignment:
You need to use MS word document to prepare and submit the assignment on VU-LMS.
It should be clear that your assignment will not get any credit if:
The assignment is submitted after due date.
The assignment is not in the required format (doc or docx).
The submitted assignment does not open or file is corrupt.
Assignment is copied (partial or full) from any source (websites, forums, students, etc.).
Assignment solution submitted in image format or image(s) pasted in the solution file.
Objective:
To enhance the knowledge about Cloud Security and Virus Attacks involved in Network Security.
Assignment
Question No.1: 10 Marks
Different organizations are providing cloud services to their clients/users/customers and suffering from the various issues. Which countermeasures these organizations can use to avoid following issues:
ABC Organization is providing free email services to end users but some unknown person is using it for spamming.
An organization requires Signup access to its free cloud storage services. The administrators of the organization can view and manage user data. After some days, one of the administrators leaked users’ data. Now users are receiving spam emails and SMS.
A Bank is providing credit card services to its customers. A person lost his credit card and he received an Email/SMS of credit card transaction from bank.
A Multinational organization is providing credentials to their employees to access their online portal and manage their services. One of the employees stuck in some problem and provide credentials to third person outside the organization for help. After somedays organization detected that their critical services are controlled and manipulated by some anonymous person.
XYZ University is providing access to its students to their result and other online portals but one of its students is executing scripts to access the server again and again until the server gets down.
Question No.2: 10 Marks
Suppose a system is infected with a virus and functioning abnormally. Before virus is diagnosed, some malicious activates are being faced by the user. Now during the virus lifetime in the system, it will go through different phases. You need to identify its phases for the following mentioned scenarios:
Scenario
Phase
User run IDM (Internet Download Manager) application in the system then instead of execution, it creates multiple files in different portions of hard disk.
User tries to open any file but system shutdown immediately and damage operating system files.
User opened a file but instead of executing that file it executed another file in infinite loop.
User open PDF reader application and virus got activated.
On opening an excel file, a virus just created two different copies of it.
Best of Luck!
Assignment No. 02
Semester: Fall 2019
Network Security-CS315 Total Marks: 20
Due Date: 28/11/2019
Instructions:
Please read the following instructions carefully before submitting assignment:
You need to use MS word document to prepare and submit the assignment on VU-LMS.
It should be clear that your assignment will not get any credit if:
The assignment is submitted after due date.
The assignment is not in the required format (doc or docx).
The submitted assignment does not open or file is corrupt.
Assignment is copied (partial or full) from any source (websites, forums, students, etc.).
Objective:
To enhance the knowledge about Cryptographic techniques involving symmetric and asymmetric algorithms.
Assignment
Question No.1: 10 Marks
Message authentication in “One-way Hash” function can be implemented with and without encryption. Considering the scenario where a message is authenticated without encryption between two stations, you are required to answer the following questions:
a) What will be component of the message sent from station A and received at station B?
b) What component of the message will ensure at receiving station that message is not corrupted?
Question No.2: 10 Marks
Cryptography is usually done by using Symmetric and Asymmetric encryption algorithms like Public-key encryption algorithms and Hash functions respectively. How would you differentiate Public-key encryption algorithms and Hash functions on the basis of following?
a) Mechanism of mathematical operations.
b) Number of keys being used for cryptography.
Best of Luck!
CS315 Lecture Handout and Videos Download
CS315 - Network Security
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