The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 23, 2005
Filed:
Sep. 07, 1999
Applicants:
Jens Hake, Kemtau, DE;
Jörg Thelen, Bonn, DE;
Inventors:
Jens Hake, Kemtau, DE;
Jörg Thelen, Bonn, DE;
Assignee:
T-Mobile Deutschland GmbH, Bonn, DE;
Primary Examiner:
Int. Cl.
CPC ...
H04M001/66 ; H04M001/68 ; H04M003/16 ;
U.S. Cl.
CPC ...
Abstract
The invention relates to a method for improving the security of authentication procedures in digital mobile radio telephone systems. In order to make it more difficult if not impossible to work out a secret code KI, several different secret SIM-specific codes KI are contained in the mobile radio telephone network and on a subscriber identity module SIM and a code KI for the implementation of said authentication is selected from the various secret codes thus contained during the authentication process between the subscriber identity module and the mobile radio telephone system pertaining to said SIM.