Subscriber authentication in a mobile communications system

Details Subscriber authentication in a mobile communications system Subscriber authentication in a mobile communications system

1995-10-17

1999-11-23

Swann, Tod R

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 25, 380 49, 455410, 455411, H04K 100, H04L 900, H04Q 720

Patent

active

059914076

ABSTRACT:
An authentication procedure in a Global System for Mobile Communications (GSM)-based mobile communications system relies on a challenge and response principle. A 32-bit Signed Response (SRES) parameter is calculated by an A3 algorithm from a 128-bit random number (RAND) and a 128-bit authentication key K.sub.i in a mobile station, and in an authentication center, and the SRES values are compared. A Cellular Authentication and Voice Encryption (CAVE) algorithm having a 152-bit input parameter and a 18-bit output parameter is employed as the A3 algorithm. Parameter adaptation functions are provided between the input parameter of the CAVE algorithm and the GSM-type input parameters, namely the random number RAND and the authentication key K.sub.i, as well as between the output parameter of the CAVE algorithm and the GSM output parameter, namely the signed response SRES.

REFERENCES:
patent: 5319710 (1994-06-01), Atalla et al.
patent: 5400390 (1995-03-01), Salin
patent: 5513245 (1996-04-01), Mizikovsky et al.
patent: 5551073 (1996-08-01), Sammarco
patent: 5557676 (1996-09-01), Naslund
patent: 5629974 (1997-05-01), Rajala et al.
patent: 5642401 (1997-06-01), Yahagi
"Applied Cryptography" by Bruce Schneier @ 1994 see p. 158.

Affiliated with

Also associated with

Rating

Subscriber authentication in a mobile communications system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Subscriber authentication in a mobile communications system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Subscriber authentication in a mobile communications system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1231194