Patent ID: 7742603

Claim:
A method for providing anonymous broadcast message security between a first wireless terminal of a vehicle and a second wireless terminal based on a public-key cryptography using a private key for encrypting a data message and a public key for decrypting the data message, the method comprising: receiving a certificate by the first wireless terminal, the certificate including a first portion of the private key and the public key, wherein the public key is shared by a plurality of wireless terminals including at least the first wireless terminal and the second wireless terminal; storing only a first portion of the private key in the first wireless terminal, with the private key having two portions; generating the remaining portion of the private key in the first wireless terminal based on a configuration of a plurality of vehicle components of the vehicle, such that the remaining portion is not stored in the first wireless terminal and the remaining portion changes when the configuration of the vehicle components of the vehicle changes, with the first portion and the remaining portion being different from each other; generating the data message at the first wireless terminal; signing at least a portion of the data message with the private key to generate a signed message; transmitting the signed message to the second wireless terminal; and authenticating the signed message at the second wireless terminal by decrypting the signed message using the public key.