Abstract: An anonymous attestation cryptographic protocol is provided for enabling a target (device 4) to attest to a predetermined property of the device without needing to reveal its identity to a verifier (8). When obtaining a credential from an issuer (6) to attest to the predetermined property, the credential is validated by an intermediary device (2) which is a separate consumer electronics device to the target device (4) itself. This allows the relatively processor-intensive calculations required for validating the credential to be performed on a separate device (2) from the device (4) for which the attestation has been made, allowing anonymous attestation protocols to be used for lower powered target devices such as sensors in the internet of things.

Abstract: A method of post-manufacture generation of the device certificate 20 for verifying an electronic device 2 according to a public key infrastructure is provided. The method comprises obtaining, at a certificate generating apparatus 40, a first key 42 associated with the device 2. A second key 22 for the electronic device is derived from the first key 42. The device certificate 20 for the PKI is generated with the second key acting as the public key 22 associated with the device certificate 20. In a corresponding way a private key 24 for the PKI can be generated by the electronic device 2 based on a shared first key 42. This approach enables the manufacturing cost for manufacturing an electronic device to be reduced whilst still enabling use of a PKI for attesting to properties of the device 2.

Abstract: An anonymous attestation cryptographic protocol is provided for enabling a target (device 4) to attest to a predetermined property of the device without needing to reveal its identity to a verifier (8). When obtaining a credential from an issuer (6) to attest to the predetermined property, the credential is validated by an intermediary device (2) which is a separate consumer electronics device to the target device (4) itself. This allows the relatively processor-intensive calculations required for validating the credential to be performed on a separate device (2) from the device (4) for which the attestation has been made, allowing anonymous attestation protocols to be used for lower powered target devices such as sensors in the internet of things.

Abstract: A method of post-manufacture generation of the device certificate 20 for verifying an electronic device 2 according to a public key infrastructure is provided. The method comprises obtaining, at a certificate generating apparatus 40, a first key 42 associated with the device 2. A second key 22 for the electronic device is derived from the first key 42. The device certificate 20 for the PKI is generated with the second key acting as the public key 22 associated with the device certificate 20. In a corresponding way a private key 24 for the PKI can be generated by the electronic device 2 based on a shared first key 42. This approach enables the manufacturing cost for manufacturing an electronic device to be reduced whilst still enabling use of a PKI for attesting to properties of the device 2.