Secure communication of iot devices for vehicles

A method for establishing secure communication between a plurality of Internet of Things (IoT) devices in one or more vehicles, each IoT device including a hardware processor, associated memory, a unique identification, a digital identity token and a cryptographic key, the method comprising:

• inviting a second IoT device by a first IoT device to establish a communication line with the first IoT device by receiving a digital identity token from the second IoT device;
• establishing a secure communication line between the first IoT device and the second IoT device by authenticating a communication line between the first IoT device and the second IoT device and issuing a digital certificate to the communication line;
• grouping the plurality of IoT devices into different groups based on a predetermined criteria;
• and
• including group memberships for the different groups in respective attribute certificates of the respective devices.