SEm/escapeLab/LFSR

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The aim of this task is to find the proper feedback function of an LFSR in a remote control.
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The aim of this task is to find the proper feedback function of an LFSR within a remote control emitter.
 
This value is the second key to opening the safe.
 
This value is the second key to opening the safe.
  
 
= Specifications =
 
= Specifications =
4-bit Galois LFSR
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A system comprising an RF emitter and a receiver allows to transmit a button press.
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When the emitter is powered via USB, it continuously sends the output bit of a 4-bit Galois LFSR.
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The receiver is connected to an FPGA board and a LED is switched on when the proper code is received.
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The position of the LFSR XOR feed-in taps has to be found in order to match to the receiver.
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These positions correspond to the '1's of a 4-bit binary number, which is the value to find.

Revision as of 12:40, 24 April 2018

Contents

Welcome to the SEM escape lab

Finding the feedback terms of an LFSR

The aim of this task is to find the proper feedback function of an LFSR within a remote control emitter. This value is the second key to opening the safe.

Specifications

A system comprising an RF emitter and a receiver allows to transmit a button press. When the emitter is powered via USB, it continuously sends the output bit of a 4-bit Galois LFSR. The receiver is connected to an FPGA board and a LED is switched on when the proper code is received.

The position of the LFSR XOR feed-in taps has to be found in order to match to the receiver. These positions correspond to the '1's of a 4-bit binary number, which is the value to find.

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