Giesecke & Devrient Gmbh

Eric Johnson

Hermann Drexler

Harald Vater

The invention relates to a data carrier having a semiconductor chip. In order to prevent an attacker from determining secret data of the chip from intercepted signal patterns of the chip, 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.

Access-controlled data storage medium

The invention relates to a data carrier () having a semiconductor chip (). In order to prevent an attacker from determining secret data of the chip () from intercepted signal patterns of the chip (), 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.

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Munich, Germany

Eric Johnson