4. We conduct a known plaintext attack on LFSR-based stream cipher. We know that the plaintext was:

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Chapter1: Introduction
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4. We conduct a known plaintext attack on LFSR-based stream cipher. We know that
the plaintext was:
1001 0010 0110 1101 1001 0010 0110
and the corresponding ciphertext was:
1011 1100 0011 0001 0010 1011 0001
Answer the following tasks with motivation.
(a) What is the degree of the key stream generator?
(b) What is the intialization vector?
(c) Determine the feedbak coefficients of LFSR.
Transcribed Image Text:4. We conduct a known plaintext attack on LFSR-based stream cipher. We know that the plaintext was: 1001 0010 0110 1101 1001 0010 0110 and the corresponding ciphertext was: 1011 1100 0011 0001 0010 1011 0001 Answer the following tasks with motivation. (a) What is the degree of the key stream generator? (b) What is the intialization vector? (c) Determine the feedbak coefficients of LFSR.
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