Patent ID: 8769280
Filing Date: 2014-07-01
Classification: H04L

Abstract:
1. An authentication method for a non-real-time Internet Protocol Television (IPTV) system, comprising: decrypting a first encrypted value included in a contents request message received from a device using a session key, and then verifying validity of the contents request message; generating a second encrypted value by encrypting a timestamp variation between an authentication apparatus and the device using the session key if verification results of the contents request message are valid; generating verification information for verifying the authentication apparatus by using the second encrypted value and a plurality of random numbers included in the contents request message and wherein the generating the verification information further comprises calculating a common divisor and a common multiple of a first random number and a second random number which are included in the plurality of random numbers; generating a first verification value using the common divisor and the second encrypted value; and generating a second verification value using the common multiple and the second encrypted value; and sending the verification information, together with contents corresponding to the contents request message, to the device.