Hello, First, thanks to all for this awesome forum. I've already learned a lot from you all! Can someone link me to a deep technical guide to how the keys work? Specifically, I want to understand how the key is authorized to do certain actions to the car. Other than the mechanical key that's cut to a literal private key, there appears to be 3 functions: 1. Wireless Remote (ie: the unlock, lock, & panic buttons on the fob) 2. SKS = Smart Key System 3. Starting the car, which works even when SKS is disabled or the battery is dead First question: What is the technology that allows authorization of a given key to preform each of the above actions? Is there a different private key & tech for each of the above actions? At this point I think it's an RFID chip for both  & , and  is a different tech all-together. Is that assumption accurate? I'm mostly concerned with the cryptographic tech with regard to the security risks of purchasing a used car and/or a new/used key fob. Ideally, after purchasing a used Prius, one would want to: 1. securely wipe all previous private keys on all the key fobs 2. securely wipe the list of all authorized keys from the car's storage 3. generate new cryptographic key pairs on each of the key fobs 4. whitelist all the new keys on the car's storage Second Question: Is it possible to do any or all of the above steps? TIA!