Access-controlled data storage medium

US8457302B1 · kind B1 · utility

Assignee

• GIESECKE & DEVRIENT GMBH · DE

Inventors

• Harald Vater · Gießen, DE
• Hermann Drexler · Munich, DE
• Eric M. Johnson · Brooklyn, US

Key dates

• Filing date: May 17, 1999
• Grant date: Jun 4, 2013
• Expiry date: May 17, 2019

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L2209/08
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

The invention relates to a data carrier (1) having a semiconductor chip (5). In order to prevent an attacker from determining secret data of the chip (5) from intercepted signal patterns of the chip (5), security-relevant operations are performed only with commands or command strings of the operating program whose use does not permit the processed data to be inferred from the signal patterns.