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Active shielding protection device for security chip and method thereof

A shielding protection and security chip technology, applied in the protection of internal/peripheral computer components, etc., to enhance the driving capability, defend against detection attacks or FIB manipulation

Pending Publication Date: 2021-04-23
广州万协通信息技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide an active shielding protection devic

Method used

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  • Active shielding protection device for security chip and method thereof
  • Active shielding protection device for security chip and method thereof
  • Active shielding protection device for security chip and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0032]Example 1

[0033]This embodiment provides an active shield protection device for a safety chip, such asfigure 1 As shown, including: drive module, shielding module, detection module, and judgment module;

[0034]The drive module includes a buffer greater than or equal to 2x, is used to enhance the driving capability of digital logic output.

[0035]The shielding module includes a shielded wiring and a coil unit for protecting the FIB attack. The shield wiring follows the design rules of the minimum line width and minimum interval using the process top metal wire, and the wiring wiring is covered by the top shielding wiring. The change unit is odd, and the specific change unit logarithm The area of ​​the safety chip is protected from the protected area and the area of ​​the shielding unit and the shielded wiring of the shield, the input order of the first set of change units and the output order of the last set of change units are the same, the intermediate coil unit The line sequence ...

Example Embodiment

[0040]Example 2

[0041]The present embodiment provides an active shielding method for a safety chip using an active shield protection device of the safety chip in Example 1. The following steps:

[0042]S1, the digital logic output to the shield module in the drive module drive, the shielding module to resist the FIB attack process by shielding the wiring method and the random number of the coil unit.

[0043]S2, using the detection module to detect if the shielding module exists, and transmits the detection result to the judgment module;

[0044]S3, the determination module performs random scrambling detection signal output by the detection module while comparing the detection signal and the desired value, issuing alarm signal or reset signal based on the comparison result.

[0045]The entire device can work in three different working modes: Standby mode, Selfcheck mode, and Active mode.

[0046]When the device operates in the Active mode, the output of the digital logic D flip-flop (such as REG)7:...

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PUM

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Abstract

The invention discloses an active shielding protection device for a security chip and a method thereof, and relates to the technical field of chip protection. The device comprises a driving module, a shielding module, a detection module and a judgment module, the driving module is used for enhancing the driving capacity of digital logic output, the shielding module is used for protecting against FIB attacks, the detection module is used for detecting disconnection of shielded wiring, and the judgment module is used for judging whether a chip is subjected to external FIB attacks or not. According to the method, based on a random time-varying shielding wiring scheme and a random scrambling strategy and judgment mechanism, detection attacks or FIB manipulation can be effectively defended, a core circuit covering the lower surface of a shielding layer is protected, an alarm or reset signal is sent out in time, and the safety of a chip system is improved.

Description

technical field [0001] The invention relates to the technical field of chip security, in particular to an active shielding protection device and method for a security chip Background technique [0002] Security chips have been widely used in the Internet of Things, smart cards, and mobile payments, but the means of attacking security chips are also increasing. Physical attacks on security chips can be classified into non-intrusive attacks, semi-intrusive attacks, and intrusive attacks according to the damage when attacked. Typical non-intrusive attacks include voltage attack, temperature attack, frequency attack, glitch attack, power consumption attack and fault attack, etc. Typical semi-intrusive attacks include ultraviolet attack, back imaging technology, laser scanning technology and defect injection attack, etc. Typical intrusive attacks include probe attacks and FIB attacks. FIB technology can remove passivation layer or deposit metal layer through physical sputtering...

Claims

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Application Information

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IPC IPC(8): G06F21/71
CPCG06F21/71
Inventor 张奇惠刘曼
Owner 广州万协通信息技术有限公司