Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN: 9780133594140
Author: James Kurose, Keith Ross
Publisher: PEARSON
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Chapter 2: Problem 7
Previous Problem
Problem List
Next Problem
(1 point) Note: The notation from this problem is from Understanding Cryptography by Paar and
Pelzl.
We conduct a known-plaintext attack against an LFSR. Through trial and error we have determined
that the number of states is m = 4.
The plaintext given by
10001010 = x0x1x2x3x4 x 5 x 6 x 7
when encrypted by the LFSR produced the ciphertext
00010011
=
YoY1Y2Y3Y3Y5Y6Y7.
What are the tap bits of the LFSR? Please enter your answer as unspaced binary digits (e.g. 0101
to represent p3 = 0, p2 = 1,p1 = 0, po = 1).
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Transcribed Image Text:Chapter 2: Problem 7 Previous Problem Problem List Next Problem (1 point) Note: The notation from this problem is from Understanding Cryptography by Paar and Pelzl. We conduct a known-plaintext attack against an LFSR. Through trial and error we have determined that the number of states is m = 4. The plaintext given by 10001010 = x0x1x2x3x4 x 5 x 6 x 7 when encrypted by the LFSR produced the ciphertext 00010011 = YoY1Y2Y3Y3Y5Y6Y7. What are the tap bits of the LFSR? Please enter your answer as unspaced binary digits (e.g. 0101 to represent p3 = 0, p2 = 1,p1 = 0, po = 1).
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