Up: Math 65S Home Page
Show your work on all problems.
Feel free to use a calculator.
- 1.
- Finish encrypting the letter ``M'' (in ASCII) started in class using
the linear feedback shift register below and the initialization string 1001.
Make sure you show the bits in each cell at each stage, as on p. 58 of
Cryptology .
- 2.
- Now encrypt the letter ``M'' using the nonlinear feedback shift
register below and the same initialization string.
Make sure you show the bits in each cell at each stage, as on p. 58 of
Cryptology .
| input 1 |
input 2 |
output |
| |
|
1 |
| |
1 |
|
| 1 |
|
1 |
| 1 |
1 |
1 |
- 3.
- Do problem 22 on page 21 of Cryptology .
- 4.
- Suppose we randomly choose a DES key and then happen to notice that
one of the subkeys it produces is all zeroes. Is this bad? Why or why not?
- 5.
- Suppose we randomly choose a DES key and then happen to notice that
the subkeys it produces are all all zeroes. Is this bad? Why or why
not?
Assignment #7, Due 1 Nov
This document was generated using the
LaTeX2HTML translator Version 97.1 (release) (July 13th, 1997)
Copyright © 1993, 1994, 1995, 1996, 1997,
Nikos Drakos,
Computer Based Learning Unit, University of Leeds.
The command line arguments were:
latex2html -link 0 -split +0 hw7.tex.
The translation was initiated by Joshua Holden on 10/30/2000
Up: Math 65S Home Page
Joshua Holden
10/30/2000
