	US 7,353,211 B2
	Method for encrypting data and a telecommunications terminal and access authorization card
Martin Hans, Hildesheim (Germany); Frank Kowalewski, Salzgitter (Germany); Josef Laumen, Hildesheim (Germany); Gunnar Schmidt, Wolfenbuettel (Germany); Siegfried Baer, Pforzheim (Germany); Mark Beckmann, Braunschweig (Germany); and Wael Adi, Braunschweig (Germany)
Assigned to Robert Bosch GmbH, Stuttgart (Germany)
Appl. No. 10/148,943 PCT Filed Dec. 01, 2000, PCT No. PCT/DE00/04278 § 371(c)(1), (2), (4) Date Nov. 13, 2002, PCT Pub. No. WO01/43471, PCT Pub. Date Jun. 14, 2001.
Claims priority of application No. 199 58 749 (DE), filed on Dec. 07, 1999; and application No. 100 17 424 (DE), filed on Apr. 07, 2000.
Prior Publication US 2003/0097341 A1, May 22, 2003
Int. Cl. G06Q 99/00 (2006.01)

U.S. Cl. 705—67 [705/50; 705/51; 705/57; 705/59; 705/65; 726/2; 726/26; 726/28; 726/30; 713/150; 713/165; 713/169; 713/182; 380/200; 380/201; 380/202; 380/203]

16 Claims

1. A method of encrypting data to be transmitted between a selected service provider and a telecommunications terminal over a telecommunications network, the method comprising:

encrypting the data to be transmitted over the telecommunications network as a function of the selected service provider;

sending an identification request from the service provider to the telecommunications terminal before transmission of data between the telecommunications terminal and the selected service provider, the identification request requesting that a key that is allocated to the selected service provider be selected from a plurality of keys stored in one of the telecommunications terminal and an access authorization card inserted into the telecommunications terminal;

encrypting the identification request using a selected key to yield an encrypted response; and

transmitting the encrypted response from the telecommunications terminal to the selected service provider for authentication of the telecommunications terminal;

wherein the data to be transmitted is encrypted using the selected key for encrypting the identification request for authenticating the telecommunications terminal.