Title:
【発明の名称】メッセージをスクランブルすることによってアクセスを防止する携帯可能なデータ記憶媒体
Document Type and Number:
Japanese Patent JP2003525538
Kind Code:
A
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.
Inventors:
Drexler, Hermann
Ferter, halalt
Ferter, halalt
Application Number:
JP2001548354A
Publication Date:
August 26, 2003
Filing Date:
December 20, 2000
Export Citation:
Assignee:
Giesecke und Diffrient Gamebha
International Classes:
G07F7/12; G06F7/72; G06F21/75; G06F21/86; G06K19/073; G07F7/10; G09C1/00; H04L9/16; H04L9/18; (IPC1-7): H04L9/16; G06K19/073; G09C1/00; H04L9/18
Foreign References:
| WO1999035782A1 | 1999-07-15 | |||
| WO2001048974A1 | 2001-07-05 | |||
| US5504817A | 1996-04-02 | |||
| WO1999060534A1 | 1999-11-25 | |||
| US5991415A | 1999-11-23 |
Attorney, Agent or Firm:
Seiji Yanagida (1 person outside)