Patent · US Expired

Method for personalization of an active card

US5557679A · kind A · utility

41Cited by

9References

13Claims

0Family size

Assignee

Comvik GSM AB · SE

Inventors

Tomas Julin · Stockholm, SE
Bjorn Almgren · Bromma, SE
Leif Sandberg · Boo, SE

Key dates

Filing date	Mar 30, 1995
Grant date	Sep 17, 1996
Priority date	—
Expiry date	Mar 30, 2015

Classification

Technology area (CPC H)Electricity
CPC primaryH04W12/35
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

Personalization of an active so-called SIM card for a mobile telephone system of the GSM type is effected in a place connected to the central computer of the system via a communication network. The card identity IMSI and card authentication key Ki are transferred in line-encrypted form to terminal equipment in that place, where the card is inserted in a reader. After line decryption, the result thereof is transferred to the card in a manner to prevent unauthorized listening-in. This can be done in a safety box or by double encryption of IMSI and Ki, the decryption thereof being performed within the card by means of a unique card key Ksim.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.