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Method and apparatus for increasing circuit safety and preventing unauthorized use

An unauthorized and secure technology, applied in the direction of preventing unauthorized use of memory, secure communication devices, computer security devices, etc., to achieve the effect of improving circuit security

Inactive Publication Date: 2003-07-02
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0033] However, due to the associated power supply traces generated by non-synchronous logic circuits, the described method has to be supported by further protection measures so that DPA can be successfully prevented

Method used

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  • Method and apparatus for increasing circuit safety and preventing unauthorized use
  • Method and apparatus for increasing circuit safety and preventing unauthorized use
  • Method and apparatus for increasing circuit safety and preventing unauthorized use

Examples

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Embodiment Construction

[0055] The most important part of the invention is the use of an automatic regulation of the operating circuit or specific logic modules, in such a way that allocating these temporarily allocated peak currents to data processing operations or calculations, which are performed at the relevant time, become Much more difficult.

[0056] The idea behind the present invention is to de-correlate power trace signals associated with data processing operations. figure 1 Two different power supply signal traces are shown. For a successful DPA, it is very important that the various power traces can be aligned with each other in such a way that the time periods occupied by the relative phases computed in the different power signal traces are the same (e.g. C11 vs. C21 ). In this case, the sum T(i,t) reveals the secret information (as above). exist figure 1 The phase calculated in does not correspond. C 11 with C 21 mismatch and C 12 with C 22 Mismatch.

[0057] If nothing is don...

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PUM

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Abstract

Method for increasing the security of circuits, especially smart card circuits, against unauthorized access in which the signal curves produced by data processing processes in self-timed circuits are decoupled. <??>An Independent claim is made for an arrangement for increasing the security of circuits, especially smart card circuits, against unauthorized access in which an adjustable device (2) for power regulation is connected between the power supply (3) and the self-timing circuit (1).

Description

technical field [0001] The present invention relates to a method and a device for improving the security of circuits by preventing unauthorized access, especially for improving the security of cards, especially smart cards, against being attacked, here, the following The method described is to obtain information about the internal operation of an electronic circuit by measuring the current or voltage draw. Background technique [0002] Advances in microelectronics in the 1970s made possible the creation of microcomputers in the form of credit cards without a user interface. Such computers are called smart cards. In smart cards, data memory and arithmetic and logic units are integrated into a single chip that is only a few square millimeters in size. Smart cards are used inter alia as telephone cards and GSM SIM cards and in banking and healthcare. The smart card has thus become a computing platform that we can see everywhere. [0003] Currently, smart cards are primarily...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F12/14G06F21/75G06F21/86G06K17/00G06K19/073H04L9/06H04L9/10
CPCG06K7/0086G06K19/073H01L23/576H04L9/003G06K7/0091H04L2209/08H01L2924/0002H01L2924/00
Inventor A·M·G·佩特尔斯M·福伊泽尔
Owner NXP BV
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