Methods for rapid authentication and authorization between devices with key updates

A method for ensuring identity verification among devices in a system communicating with a public key infrastructure, comprising at least one trusted authority and at least two devices;

• characterized by comprising the steps:
• calculating a revocation control value using an identity credential and a timestamp associated with a vehicle, and signed with a revocation control key loaded on each device in the same manner and updated only by the mentioned trusted authority on authorized devices;
• sending at least a unique device revocation public key, the mentioned identity credential, the message to be sent, the mentioned timestamp, and the mentioned revocation control value, signed with the device revocation private key, which is the pair of the mentioned device revocation public key;
• performed by a device acting as a source function;
• and the steps:
• obtaining the sent timestamp and revocation control value by decrypting with the device revocation public key of the sending device;
• generating a revocation control value using the identity credential received from the sending device, the device revocation control key present in it, and the obtained timestamp;
• and
• determining that the sending device is an authorized device if the revocation control values obtained and generated from the sending device are equal performed by a device acting as a target function.