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# Assignment No. 03 Semester: Spring 2017 Information Security – CS205

 Assignment No. 03 Semester: Spring 2017 Information Security – CS205 Total Marks: 20 Due Date 17th of July, 2017 Objectives Objective of this assignment is to assess the understanding of students about basics of Cryptology, Cryptography, Cipher Methods (Bit Stream, Block Cipher) & Cryptography Algorithms.     Instructions Please read the following instructions carefully before submitting assignment: You should consult the recommended books, PowerPoint slides and audio lectures to clarify your concepts. You are supposed to submit your assignment in .doc or .docx format. Any other formats like SCAN IMAGES, PDF, ZIP, RAR and BMP will not be accepted. It should be clear that your assignment will not get any credit if: The assignment is submitted after due date. The assignment is copied from Internet or from any other student. The submitted assignment does not open or file is corrupt. Note: No assignment will be accepted after the due date through email in any case (load shedding, server down, internet malfunctioning etc.). It is recommended to upload solution file at least two days before its closing date.   For any query about the assignment, contact at cs205@vu.edu.pk

Question Statement                                                                                Marks: 20

In this assignment, you have to encrypt a plaintext using transportation block cipher method.

You have to use two keys K1 and K2, which are of 16 and 32 bits respectively and having followed key pattern:

Key Pattern

Key Pattern 1 (K1)

1↦5, 2↦10, 3↦13, 4↦3, 5↦7, 6↦12, 7↦14, 8↦16, 9↦1, 10↦4, 11↦9, 12↦11, 13↦15, 14↦6, 15↦8, 16↦2.

Key Pattern 2 (K2)

1↦16, 2↦7, 3↦10, 4↦25, 5↦21, 6↦3, 7↦18, 8↦23, 9↦12, 10↦15, 11↦6, 12↦27, 13↦17, 14↦30, 15↦20, 16↦2, 17↦24. 18↦29. 19↦8. 20↦4. 21↦11. 22↦14. 23↦22. 24↦9. 25↦28. 26↦1. 27↦31. 28↦32. 29↦13. 30↦26. 31↦19. 32↦5.

First, you should have encrypted their plain text using Key K2, then the result (obtained cipher text through K2 encryption) is encrypted again by Key K1.

 Plaintext
 Plaintext
 Encrypted With K2
 Final Cipher text
 Encrypted With K1

Plain text

True wisdom comes to each of us when we realize how little we understand about life, ourselves, and the world around us.

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