A system and method for trustless key provisioning

A method of encryption key provisioning comprising:

• providing, by a quantum computing safe method, a shared secret data to a device and also to a security service;
• using the provided shared secret data to provide a root key;
• and
• using the root key as a basis for a sequence of stages, wherein each stage comprises an operation which converts a start key into a different generated key, and the same stages are carried out in parallel at the device and at the security service;
• wherein the root key is used as the start key for a first stage of the sequence, and a generated key produced by each stage of the sequence, except for the final stage of the sequence, is used as a start key for a next stage of the sequence;
• and
• wherein the generated keys produced by the last stage of the sequence at the device and at the security service are symmetric keys.