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Method for operating a portable data carrier and such a portable data carrier

A data carrier, portable technology, applied in digital data protection, digital transmission systems, countermeasures against attacking encryption mechanisms, etc., can solve problems such as difficulty in current curve synchronization

Active Publication Date: 2015-09-16
捷德移动安全有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of randomly controlled wait states during the processing of commands by the processor unit of the portable data carrier makes it difficult to synchronize the current curves required for current analysis

Method used

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  • Method for operating a portable data carrier and such a portable data carrier
  • Method for operating a portable data carrier and such a portable data carrier
  • Method for operating a portable data carrier and such a portable data carrier

Examples

Experimental program
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Embodiment Construction

[0021] figure 1 A schematic view of a preferred embodiment of a portable data carrier according to the invention in the form of a chip card 10 is shown. The chip card 10 is designed to exchange data with an external instance in the form of a terminal device 20 . Data exchange is here understood to mean signal transmission, mutual control and, in simple cases, also a connection between the smart card 10 and the terminal 20 . In general, data exchange can be described by the sender-receiver model known from information theory: Data or information is coded in symbols and then transmitted by the sender to the receiver via a transmission channel. It is decisive here that the sender and receiver use the same encoding, so that the receiver can understand the message, ie can decode the received data.

[0022] For data transmission or communication between the smart card 10 and the terminal 20 , both the smart card 10 and the terminal 20 have suitable communication or IO interfaces 1...

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PUM

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Abstract

The invention is based on the basic idea of, instead of, for example, performing a waiting loop in which "nothing" happens during a randomly controlled waiting time of a processor unit, as in the prior art, rather use said randomly controlled waiting time of the processor unit to check if data stored in a memory unit of the portable data carrier still have integrity or possibly have already been corrupted by an attack. On the basis of said basic idea, according to a first aspect of the invention, a method for operating a portable data carrier having a processor unit for processing commands and a memory unit for storing data is provided, wherein randomly controlled waiting states, in particular for protecting against SPA / DPA attacks, are inserted into the processing of the commands, i.e., between the commands. The method is characterized in that an actual checksum is calculated for the data of a selected range of the memory unit during a randomly controlled waiting state. The invention further relates to such a portable data carrier.

Description

technical field [0001] The invention relates to a method for operating a portable data carrier and to such a portable data carrier. In particular, the invention relates to a method for operating a chip card or a chip module as well as such a chip card or such a chip module. Background technique [0002] Portable data carriers in the form of chip cards with a processor unit, also known as microprocessor chip cards or processor chip cards, are used in many security-critical areas, for example as documents to prove the user's identity, for example to mobile radio networks Access rights or to perform payment transactions. In this case, chip cards are frequently used in conjunction with terminals designed for the respective application, which are designed to access the security-critical data of such a chip card after a preceding authentication. [0003] When executing security-critical applications via portable data carriers, such as chip cards, the portable data carrier and th...

Claims

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Application Information

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IPC IPC(8): H04L9/00
CPCH04L9/003G06F21/64H04L9/3239H04L9/3242
Inventor T.斯托克
Owner 捷德移动安全有限责任公司