Controlling access to a motor vehicle

A method for delivering a digital key, from a sender to a recipient, to securely use a motor vehicle, the method comprises the steps of:

• a secret of the sender is deposited with a manufacturer service;
• an input for the secret by the recipient is acquired;
• the input is relayed from the recipient to a tracking service;
• a key created by the recipient is signed by the sender;
• the signed key is relayed to the recipient;
• the input is relayed from the tracking service to the manufacturer service;
• the manufacturer service determines that the input and the secret match;
• a consent is relayed from the manufacturer service to the tracking service;
• an attestation is relayed from the tracking service to the manufacturer service;
• the attestation is signed by the manufacturer service;
• and
• the attestation is deposited with the tracking service.

A system comprising:

• a memory storing instructions of a manufacturer service and a tracking service that, when executed by a computer processor, are configured to carry out the acts of:
• deposit a secret of the sender with the manufacturer service;
• a signed key, created by a recipient, is relayed to the recipient;
• an input for the secret by the recipient is acquired;
• the key and the input are relayed from the recipient to the tracking service;
• the input is relayed from the tracking service to the manufacturer service;
• the manufacturer service determines that the input and the secret match;
• a consent is relayed from the manufacturer service to the tracking service;
• and
• an attestation is relayed from the tracking service to the recipient.