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:
Oct. 21, 2008
Filed:
Dec. 20, 2000
Applicants:
Hermann Drexler, Munich, DE;
Harald Vater, Giessen, DE;
Inventors:
Hermann Drexler, Munich, DE;
Harald Vater, Giessen, DE;
Assignee:
Giesecke & Devrient GmbH, Munich, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L 9/00 (2006.01); H04K 1/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention relates to a data storage medium having a semiconductor chip which has at least one memory in which an operating program is stored which contains a number of commands, with each command producing signals which can be detected from outside the semiconductor chip. According to the invention, the data storage medium is designed such that data which is used more than once for a calculation process is scrambled using different functions.
Drexler, Hermann. (2008). Portable data carrier provide with access protection by rendering messages unfamiliar (U.S. Patent No. 7441125). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/7441125
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile