Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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p T Note: The notation from this problem is from Understanding Cryptography by Paar and Pelzl.
Suppose you have an LFSR with 6 state bits. The first 12 bits of output produced by this LFSR are
100011011000 = s0 $1 $2 S3 S4 S5 S6 87 Sg S9 S10 S11 -
The first bit produced is the leftmost bit and the bit most recently produced is the rightmost bit.
a) What is the initial state of the LFSR? Please enter your answer as unspaced binary digits (e.g. 010101 to represent
S5 = 0, s4 = 1, 83 = 0, s2 = 1, s1 = 0, so = 1).
%3D
b) What are the tap bits of the LFSR? Please enter your answer as unspaced binary digits (e.g. 010101 to represent
P5 = 0, p4 = 1, pP3 = 0, p2 = 1, p1 = 0, po = 1).
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Transcribed Image Text:p T Note: The notation from this problem is from Understanding Cryptography by Paar and Pelzl. Suppose you have an LFSR with 6 state bits. The first 12 bits of output produced by this LFSR are 100011011000 = s0 $1 $2 S3 S4 S5 S6 87 Sg S9 S10 S11 - The first bit produced is the leftmost bit and the bit most recently produced is the rightmost bit. a) What is the initial state of the LFSR? Please enter your answer as unspaced binary digits (e.g. 010101 to represent S5 = 0, s4 = 1, 83 = 0, s2 = 1, s1 = 0, so = 1). %3D b) What are the tap bits of the LFSR? Please enter your answer as unspaced binary digits (e.g. 010101 to represent P5 = 0, p4 = 1, pP3 = 0, p2 = 1, p1 = 0, po = 1).
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