Patent · US Expired

Portable data carrier provide with access protection by rendering messages unfamiliar

US7441125B2 · kind B2 · utility

1Cited by

6References

7Claims

0Family size

Assignee

GIESECKE & DEVRIENT GMBH · DE

Inventors

Hermann Drexler · Munich, DE
Harald Vater · Gießen, DE

Key dates

Filing date	Dec 20, 2000
Grant date	Oct 21, 2008
Priority date	—
Expiry date	Mar 5, 2023

Classification

Technology area (CPC G)Physics
CPC primaryG06F2207/7257
WIPO fieldControl
WIPO sectorInstruments

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.