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 by01100101 —D ХоXјX2XҙX4X5X6X7when encrypted by the LFSR produced the ciphertext10010100 — Уo У1 У2 Уз Уз У5 У6 Ут-What are the tap bits of the LFSR? Please enter your answer as unspaced binary digits (e.g. 0101 to representP3 = 0, p2 = 1, Pi = 0, po = 1).

Answered: Note: The notation from this problem is…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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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
01100101 —D ХоXјX2XҙX4X5X6X7
when encrypted by the LFSR produced the ciphertext
10010100 — Уo У1 У2 Уз Уз У5 У6 Ут-
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, Pi = 0, po = 1).

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it cycles through all possible 2m âˆ’ 1 states within the shift register except the state where all bits are zero), unless it contains all zeros, in which case it will never change.

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