A secure start system for an autonomous vehicle can include a communications router comprising an input interface to receive a boot-loader to enable network communications with a backend system. The secure start system utilizes a tunnel key from the backend system to establish a private communications session with a backend data vault. The secure start system then retrieves a set of decryption keys from the backend data vault, via the private communications session, to decrypt a plurality of encrypted drives of the autonomous vehicle, which enables one or more functions of the autonomous vehicle.