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:
Feb. 24, 2015
Filed:
Mar. 07, 2011
Jan Eichholz, Munich, DE;
Gisela Meister, Munich, DE;
Jan Eichholz, Munich, DE;
Gisela Meister, Munich, DE;
Giesecke & Devrient GmbH, Munich, DE;
Abstract
A method for authenticating a portable data carrier () to a terminal device by the following steps: In the data carrier () a public session key (PK) is derived (S) from a public key individual to the data carrier (PK) which has in its turn been derived (TS; S) from a public group key (PK). Further, a secret session key (SK) is derived (S) from a secret key individual to the data carrier (SK) which has in turn been derived (TS) from a secret group key (SK). Subsequently, a secret communication key (KK) is agreed on (S) between the data carrier () and the terminal device. Finally, the terminal verifies (S) the public session key (PK) of the data carrier ().