Patent ID: 7962747
Filing Date: 2011-06-14
Classification: H04L

Abstract:
1. A data transmitting apparatus comprising: a processor configured to generate first authentication data; a communication interface configured to transmit a first response request to a data receiving apparatus, said first response request including said first authentication data; the communication interface configured to receive a first response message to said first response request command from said data receiving apparatus, said first response message containing second authentication data based on said first authentication data; the communication interface configured to transmit a second response request command to the data receiving apparatus after receiving the first response message from said data receiving apparatus, and receive a second response message to the second response request command from the data receiving apparatus, said second response message containing third authentication data generated at the data receiving apparatus based on said first authentication data; and the processor configured to produce an authentication result for said data receiving apparatus based on said third authentication data included in said second response message received from said data receiving apparatus, measure a response time of the second response message received from said data receiving apparatus in response to said second response request command, judge if said data receiving apparatus is authorized to use the data based on the authentication result and the response time.