Appeal 2007-0930
Application 10/014,763
1 television set-top box or any other type of device capable of
2 transmitting or receiving information over network 104. In addition,
3 there may be multiple such devices associated with a given user. For
4 example, a given user may have a mobile telephone as well as a
5 desktop or portable computer, and may utilize both devices for
6 signature generation.
7
8 Aura teaches a method of authentication in a mobile communications
9 system. The system allows for the network to authenticate the subscriber’s
10 mobile device and the subscriber’s device to authenticate the network. See
11 abstract. In one embodiment the mobile station transmits an international
12 mobile subscriber identity (IMSI) and a random number (RAND1) to a
13 visited public land mobile network (VPLMN). The VPLMN relays this
14 information to the Home listing registry/authentication center (HLE/AUC).
15 See column 6, ll. 21-30. The HLE/AUC retrieves a key Ki from memory
16 (step 403, fig. 4), and generates a second random number (step 404, fig. 4).
17 The HLE/AUC uses the two random numbers, the key, Ki, and three hashing
18 functions to calculate the values SRES1, SRES2’ and Kc (step 405, fig. 4).
19 See column 6, ll. 40-45. The values SRES represent a signed response, i.e. a
20 signature. See column 2, l. 60. The values of the second random number
21 RAND2, SRES1, SRES2’, and Kc are transmitted to the VPLMN. The
22 VPLMN then transmits the values RAND2 and SRES1 to the subscriber’s
23 mobile device. The mobile device also has a key Ki with the same value as
24 the key Ki in the HLE/AUC unit. The Mobile unit uses the values RAND1,
25 RAND2 and Ki to calculate values for SRES1’ SRES2 and Kc. See column
26 7, ll. 12-27. The mobile unit compares the received value SRES1 and the
27 calculated value SRES1’ (step 408, fig. 4) if they match the mobile unit
28 transmits the value SRES2 to the VPLMN. See column 7, ll. 28 through 34.
7
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Last modified: September 9, 2013