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:
Jun. 06, 2000
Filed:
Mar. 28, 1997
Michel Marco Drupsteen, Na Alkmaar, NL;
Koninklijke PTT Nederland N.V., Groningen, NL;
Abstract
A method of securely loading and validating commands (COM) in a smart card (SC) is disclosed. Especially in the case where application-specific commands are loaded by an application provider (AP), that is off-line with respect to the card issuer (CI), it must be ensured that the commands are valid. The invention provides a method involving the protection of the commands (COM) by means of authentication codes, these codes (MAC1, MAC2) being produced using two different keys: one key (K1) is stored by the card issuer (CI), the other (K2) by a trusted third party (TTP). A further authentication code (MAC3), produced using a key from a set of keys (K3*), may be utilized to selectively validate commands for individual applications (e.g. AP1, AP2).