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=4m=4. The plaintext given by 01001011=x0x1x2x3x4x5x6x701001011=x0x1x2x3x4x5x6x7 when encrypted by the LFSR produced the ciphertext 11010110=y0y1y2y3y3y5y6y711010110=y0y1y2y3y3y5y6y7. 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,p0=1p

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Chapter1: Introduction
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ONLY THE TAP BITS.

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=4m=4.
The plaintext given by

01001011=x0x1x2x3x4x5x6x701001011=x0x1x2x3x4x5x6x7


when encrypted by the LFSR produced the ciphertext

11010110=y0y1y2y3y3y5y6y711010110=y0y1y2y3y3y5y6y7.


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,p0=1p3=0,p2=1,p1=0,p0=1).

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