A method to securely and asynchronously provisioning keys from one source secure device to a target secure device through a key provisioning server, in which the keys to be provisioned via the method remain unknown. The method includes the steps of, for the source secure device, encrypting a key to be transferred using a transport key so that only the target secure device can decrypt, and sending the encrypted key to the provisioning server and, for the target secure device, when available, getting the encrypted transferred key, and decrypting the transferred key using the transport key.