System and method for securely updating a registered device using a development system and a release management system operated by an update provider and an update publisher

摘要

A method of updating a registered device using a development system and a release management system. The method includes: building an update package; signing the update package using a provider signing key, wherein a first digital signature is included in the update package; encrypting the signed update package using a publisher public key; requesting, by an update client on the device, an update package; preparing, by the update service, a set of signed update packages for the device; reencrypting and resigning, by the update service, the signed update package by decrypting the initial encryption using a publisher private key of the update publisher, signing the update package using a signing key of the update publisher, and finally encrypting the update package using a device public key from the device certificate, for final encryption of the update package; and decrypting the encrypted update package using a device private key.