Ciphering between a CDMA network and a GSM network

Details Ciphering between a CDMA network and a GSM network Ciphering between a CDMA network and a GSM network

2006-09-19

2006-09-19

Feild, Joseph (Department: 2681)

Telecommunications

Radiotelephone system

Security or fraud prevention

C455S410000, C455S412100, C455S432100, C455S432200, C455S432300, C455S433000, C455S435100, C455S436000, C455S439000, C370S337000, C370S247000, C370S270000, C340S005210, C340S005740

Reexamination Certificate

active

07110747

ABSTRACT:
Shared secret data is used to authenticate and encrypt between a CDMA network and a GSM network such that a mobile station having a subscription in a GSM network can roam into a CDMA network and be authenticated to use the CDMA network and have messages encrypted without having a CDMA subscription. The goal of authenticating a GSM subscriber in a CDMA network using GSM authentication credentials is achieved by substituting a key Kc as SSD-A and messages are encrypted substituting Kc as SSD-B using a CAVE algorithm.

REFERENCES:
patent: 5887251 (1999-03-01), Fehnel
patent: 6144653 (2000-11-01), Persson et al.
patent: 6839434 (2005-01-01), Mizikovsky

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