# Homework 1 Solutions.pdf - 1 2 3 4 5 6 7 8 9 10 11 12 13 14...

• No School
• AA 1
• 21

This preview shows page 1 - 21 out of 21 pages.

1

Subscribe to view the full document.

2
3

Subscribe to view the full document.

4
5

Subscribe to view the full document.

6
7

Subscribe to view the full document.

8
9

Subscribe to view the full document.

10
11

Subscribe to view the full document.

12
13

Subscribe to view the full document.

14
15 5. In 8-bit CFB mode, if one bit of a ciphertext block is corrupted during transmission, how many blocks in total will be affected in decryption assuming DES is used? The error will affect the decryption of the ciphertext block. In addition, the error block will stay in the IV for another 64/8=8 blocks. In total, 9 blocks will be affected.

Subscribe to view the full document.

16
17

Subscribe to view the full document.

18
19 Answer to Problem 4.2: IV will be the first block to be repeated. To see this, note

Subscribe to view the full document.

• Fall '19

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes