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Circuit and method for safeguarding electronic devices

An electronic device and security protection technology, applied to circuits and fields for electronic device security protection, can solve the problem that access rights cannot be correctly identified by terminals, and achieve the effect of increasing access time

Inactive Publication Date: 2004-04-07
INFINEON TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of thing can also happen when the terminal fails, it will cause its access rights to not be correctly recognized by the terminal

Method used

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  • Circuit and method for safeguarding electronic devices
  • Circuit and method for safeguarding electronic devices
  • Circuit and method for safeguarding electronic devices

Examples

Experimental program
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Embodiment Construction

[0020] In one embodiment of the present invention will be based on figure 1 In this embodiment, the first element (a Floating gate unit, hereinafter referred to as unit A), the electrical parameter value is adjusted to a certain base value (a certain initial operating voltage U A0 ), and adjust the electrical parameter value of the second element (another floating gate unit, hereinafter referred to as unit B) to a reference value (another initial operating voltage U B0 , preferably greater than U A0 )superior. These elements are thus in their basic state. In the case of a chip card, the access attempt is typically started by inserting the card into the card reader (INS-START) and entering a PIN or similar data. It is then first checked whether the first element (cell A) is at the base value (with a base value U A0 on the initial operating voltage). If this is the case (A=_?√), the access right is checked by making the electrical parameter value of the first element (star...

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PUM

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Abstract

The access time for the use of an electronic device, for example a chip, is prolonged after each unauthorized access attempt. The access time is determined by the time for the matching of the turn-on voltages of two floating gate cells. Before an access attempt, the turn-on voltage of one cell is set to a predefined initial value and the turn-on voltage of the other cell is set to a value which is higher in comparison and which is increased after each unauthorized access.

Description

technical field [0001] The invention relates to a circuit and method for safety protection of electronic devices, in particular to a circuit and device for safety protection of chip function opening. Background technique [0002] Certain forms of electronic circuitry, such as chip cards, require a high degree of secrecy of the information contained in their circuitry or of the data stored, such as keys for encryption methods. For the information related to security protection, it is necessary to prevent the analysis and operation of others. In particular, attempts to obtain such information without authorization are to be avoided by frequently repeating unauthorized access attempts to the relevant electronic device until the security-relevant data has been analyzed or access has been achieved. This is the case, for example, when a PIN (Personal Identification Number) can be found out through several attempts. A chip or chip card is therefore secured in such a way that afte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K19/073G07C9/00G07F7/10
CPCG06K19/073G06K19/07372G07C9/00023G06Q20/341G07F7/1083G07F7/1008G07C9/215
Inventor E·R·布雷克梅尔H·帕尔姆A·库西
Owner INFINEON TECH AG
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