Skip to content
Deciphering the keyfob signal for a 1999-2004 Astra
Branch: master
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Type Name Latest commit message Commit time
Failed to load latest commit information.
Matlab Files

Astra Keyfob

A set of scripts to determine and construct the code used in 1999 - 2004 Astra keyfobs.

Data is transferred at 9600 baud using IEEE 802.3 (high -> low = '0') manchester encoding.

timing.jpg shows the order in which bits are sent.

Given a .csv in format 'time (s) | data' generateCode.m will determine the 97 bit unique code and the 34 bit incrementing code.

It produces two arrays which can be coppied into 'Astra_Keyfob.ino' to send the duplicated code over a 433MHz RF connection.

Before writing 'Astra_Keyfob.ino' I believed that an enumeration risk existed and was attempting to exploit this to predict the future codes. However I failed to notice that the 97 bit unique code changed every press and appears to be random, wheras I previously thought that it was a static code which was unique to the open/close of each key fob.

As such these tools are no real use however as they were already written I thought I might as well upload them.

You can’t perform that action at this time.