Radiotelephone installation for prepayment operation with securi

Details Radiotelephone installation for prepayment operation with securi Radiotelephone installation for prepayment operation with securi

1991-10-10

1994-04-05

Gregory, Bernarr E.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 9, 380 21, 380 43, 380 49, 379 58, 379 59, 34082531, 34082534, 455 331, 455 541, H04L 932

Patent

active

053012348

ABSTRACT:
In the course of the intercommunication between the base station and the autonomous telephone set, the first means of authentication initially generates a keyword dependent on the call charge for the current service and transmits it to the autonomous telephone set. The second means of authentication then calculates the transform of the keyword by the encryption function F with the aid of the subscriber's secret key, and transmits the transform to the first means of authentication which finally checks the authenticity of the transform to totally block the intercommunication if the authenticity is not confirmed by the check.

REFERENCES:
patent: 4219151 (1980-08-01), Haruki
Une application de la carte a microprocesseur: le module . . . , "L'echo des Recherches," No. 139, 1st quarter of 1990, pp. 13-20, Authors: P. Jolie and G. Mazziotto.
Le systeme cellulaire numberique europeen . . . , "L'echo des Recherches," No. 131, 1st quarter of 1988, pp. 5-16, Authors: B. Ghillebaert, P. Combescure and A. Maloberti.
Electrical Communication, vol. 63, No. 4, 1989, Romford, GB, pp. 389-399; M. Ballard et al.: "Cellular Mobile Radio as an Intelligent Network Application".
Hasler--Mitteilungen, vol. 45, No. 4, Dec. 1986, Bern, Switzerland, pp. 75-83; R. Kunz: "Die Chip-Karte-Multifunktionskarte der Zukunft".

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