Password protection circuit used for defending energy consumption attack

Abstract

The invention discloses a password protection circuit used for defending an energy consumption attack, and relates to the field of electronic circuits. The password protection circuit used for defending the energy consumption attack solves the problem of key leakage resulted from that the existing encryption circuit is easily subjected to the power consumption attack. The password protection circuit comprises a low-frequency current leveling module, a high-frequency current leveling module and a voltage modulator; The low-frequency current leveling module is used for generating a constant target leveling current i and compensating a load current i1 by utilizing the constant target leveling current; the load current i1 is used for providing electric energy to a protected circuit; i=i1+i2; i2 is a compensative current; the low-frequency current leveling module is also used for performing high-frequency filtration on an voltage output by a power source VCC; the high-frequency current leveling module is used for performing low-frequency filtration on the load current i1 output by the low-frequency current leveling module; the voltage modulator performs voltage transformation on the filtered current signal; and the voltage output by the voltage modulator is supplied to the protected circuit. The password protection circuit used for defending the energy consumption attack is mainly used for protecting an encrypted circuit.

Description

technical field [0001] The invention relates to the field of electronic circuits. Background technique [0002] Cryptography devices such as smart cards are widely used in various industry sectors such as telecommunications, finance, enterprise security and government, and the importance of security cannot be overstated. Although the embedded features of the cryptographic device make it impossible for attackers to directly access the key information in the cryptographic chip, the cryptographic chip will leak certain side channel information such as power consumption and electromagnetic radiation when it is working. Differential Power Analysis (DPA) ) attack technology uses the correlation between the key data and these information, and can analyze and obtain the value of the key through mathematical statistics and other methods. Due to the non-invasiveness, universality and simplicity of DPA attack, it poses a serious threat to the security of cryptographic chips such as sm...

AI Technical Summary

Problems solved by technology

[0004] The present invention is for the problem that the existing encryption circuit is vulnerable to power consumption attack, which leads to key leakage

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