Abstract: The delivery of services is managed by a system that includes a portable device and a management apparatus which receives and decrypts a first identifier generated and encrypted by the portable device. One of the devices also digitally signs a second identifier, which is validated at the other device.
Abstract: The delivery of services is managed by a system that includes a portable device and a management apparatus which receives and decrypts a first identifier generated and encrypted by the portable device. One of the devices also digitally signs a second identifier, which is validated at the other device.