TEST BANK FOR Introduction to cryptography with coding theory 2nd Edition By Wade Trappe, Lawrence C. Washington Converted
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Exam (elaborations) TEST BANK FOR Introduction to cryptography with coding theory 2nd Edition By Wade Trappe, Lawrence C. Washington(Solution Manual)-Converted
- Exam (elaborations) • 182 pages • 2021
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1. Among the shifts of EVIRE, there are two words: arena and river. Therefore, 
Anthony cannot determine where to meet Caesar. 
2. The inverse of 9 mod 26 is 3. Therefore, the decryption function is 
x = 3(y−2) = 3y−2 (mod 26). Now simply decrypt letter by letter as follows. 
U = 20 so decrypt U by calculating 3 ∗ 20 − 6 (mod 26) = 2, and so on. The 
decrypted message is ’cat’. 
3. Changing the plaintext to numbers yields 7, 14, 22, 0, 17, 4, 24, 14, 20. 
Applying 5x+7 to each yields...

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