SECURE AUTHENTICATED DISTANCE MEASUREMENT

摘要

The invention relates to a method for a first communication device to perform authenticated distance measurement between the first communication device and a second communication device, wherein the first and the second communication device share a common secret and the common secret is used for performing the distance measurement between the first and the second communication device. The invention also relates to a method of determining whether data stored on a first communication device are to be accessed by a second communication device. Moreover, the invention relates to a communication device for performing authenticated distance measurement to a second communication device. The invention also relates to an apparatus for playing back multimedia content comprising a communication device.

主权项

1. A first device for controlling delivery of protected content to a second device, the first device comprising a processor circuit, the processor circuit arranged to execute instructions, the instructions arranged to:
provide a first signal to the second device if the second device is compliant; receive a second signal from the second device after providing the first signal; and provide the protected content to the second device if the second signal is derived from a secret and a time between the providing of the first signal and the receiving of the second signal is less than a predetermined time, wherein the secret is known by the first device.