RFID/NFC security for car alarm

Electronics
1

I am not sure if this belongs in electronics or automotive…

TL;DR: I want to override my car security with an RFID reader.

I just recently lost the key fob to my car, and have been wanting to hack the alarm system anyways, so now is the time… I have been wanting to hack my car to have the alarm system/ingition protection controlled with an RFID reader, and have an ID-12LA RFID reader and have been looking at some prefabbed car alarm RFID units online.
There is slight concern about the security of RFID for this, which I don’t think is a prevalent issue as of yet…since I don’t think theres many hackers smart enough to reverse engineer my RFID number…if they want my car that bad i’m going to assume they’ll just break in some other way.

I have been curious about using NFC in conjunction with RFID as an extra layer of security. From what I understand, NFC is rewritable, and can be used to store a string of digits for someone to later recieve with their cellphone or an NFC reader.
With that in mind, I wonder if you could add an extra layer of security by using a random encryption, so that your NFC reader would recieve a new string of numbers, which the car reader then would be set to only respond to that number instead of the same RFID number, therefore making it harder to steal.

I was having weird issues getting the ID-12LA to give me a clean serial readout for some reason, and I am not opposed to just buying it prefabbed, and was looking at this unit…I’ll have to figure out where on the circuit board it recieves the trigger from the keyfob and override that with the RFID readout. Does anyone have any other suggestions?: https://www.amazon.com/Universal-Immobilizer-Bypass-Remote-Start/dp/B0009SUEZE/ref=pd_sim_107_5?_encoding=UTF8&pd_rd_i=B0009SUEZE&pd_rd_r=H4328RSWPRMXN2TQY50K&pd_rd_w=G3108&pd_rd_wg=gEOQl&psc=1&refRID=H4328RSWPRMXN2TQY50K

2

Might be useful to you:

3

I do not believe the ID-12LA will work with NFC format rfid systems.

4

@benemorius has implemented this on his car

5

I would get an NFC compatible reader if I decided to go that route.

6

thats a good conversation to keep in mind! for some reason I wasn’t able to get the ID-12LA to give me any proper serial data. I may have had a pin pulled to ground that shouldn’t have? I am unsure because I followed 2 different tutorials and neither produced results. I was using a Teensy LC and not and Arduino UNO, so i’m wondering if the voltage of the serial communication had something to do with it. from what I recall, arduinos are looking for a 5v range serial communication, while the teensy is 5v compatible but is sending a 3.3v range signal? not sure if this was the issue…I will test with an arduino at the space tonight

7

The Rigol scopes in Electronics have Serial Protocol decoding. I would suggest using one of them to see what your signals look like and verify the protocol is correct.