Hello,
Does any one has more information what kind NFC tag is used in car/motorcycle key ?
Any key-less car key can turn on car without need of battery, and i would like to know what kind of standard dues it use.
I tested my car keys with phones NFC reader, but it did not provide any lock on RFID chip inside it, so how can i read it ?
And also, is it static code, or is it some-kind dynamic, so i can't clone int that easy ?
Thank you !
Did some probing, it turns out to be 133kHz signal. SO it looks like i will be making my own pick up and transmitter circuit based on MCU 
Probing showed static data.
So it does not look to be anything fancy. One fancy thing is that in excitation stage, it does generate some data. That can be that if only this data is present, key RFID chip will send back any data to motorcycle.
In this scenario, it is perfectly safe, since you can't read key and replay it off the motorcycle, but if you are at the coil when you normally unlock motorcycle with RFID, you will know what data was send, and what data was replayed. And you just need to replay data you capture after excitation ping.
So as safety logic goes, if you already have good key in correct location, where is no point of doing any scrambling/rolling code generation, since that means you have original key. But if you try to copy it outside motorcycle, you will need to generate correct key to do it. Where is 20bit code, and it is send around 100ms, that means in order to copy code, you have to probe it 100 000s or 30minutes.
I would say it is perfectly safe. It would be more safe is key would generate ther data on different ping message, in that case, you will have to replay all messages, it would take days of work to unlock it..
Ping message:
