Rolling code security for remote controls
Remote controls can be hacked. Especially the ones that use RF with out any encoding schemes can be hacked very easily. Keyless entry for cars, garage doors etc are the ones which are more venerable to attack. Attackers use custom made handsets which mimick the frequency of the original handset to get the attack done. Rolling code security mechanisms are used to protect wireless remotes from such attacks.
The idea is to use a synchronised code. The transmitter and receiver agrees on a particular code for the next transmission. If only that matches in the next transmission will it be accepted. After every successful transmission the code is changed by either the transmitter or the receiver and is then synchronized. In this method no other handset can communicate with the receiver with out knowing the code. The only draw back of this system is that only one handset can be used.
March 20th, 2008 at 8:27 am
This is a clearer and more accurate description of how rolling code security works– basically the transmitter and receiver each have a pseudo-random number generator and cycle it once each time a signal is sent.
http://auto.howstuffworks.com/remote-entry2.htm
July 20th, 2008 at 9:58 pm
this is a good idea.could you send me the required info so i can use it in my final year project.plz you\’ll be helping me lots.