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Assignment No. 03
Total Marks: 20
17th of July, 2017
Objective of this assignment is to assess the understanding of students about basics of Cryptology, Cryptography, Cipher Methods (Bit Stream, Block Cipher) & Cryptography Algorithms.
Please read the following instructions carefully before submitting assignment:
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It is recommended to upload solution file at least two days before its closing date.
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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 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.
Final Cipher 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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