CS205 Assignment 3 Solution and Discussion

Assignment No. 03
Semester: Fall 2019
CS205: Information Security Total Marks: 25

Due Date: 22/01/2020

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)


To enhance the learning capabilities of the students about cryptography and crypto algorithms.


Question 1:
You are required to encrypt the string “Security Professional” and decrypt the string “MdgfjVhjfbteut” using following tables with “Substitution Cipher Method”.

Question 2:
You are required to encrypt the plain text “ACCOUNTABILITY” using Vigenere Square Cipher method? Suppose that keyword is “SILENT”.

Question 3:
You are required to encrypt the plain text “wearesecurityprofessionalsinuk” into cipher text using columnar transposition method with a Key: “231645”.

Best of luck

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