Security chip

Abstract

The invention provides a safety chip, preventing illegal user from attacking cipher algorithm inside the safety chip by energy analysis method but not increasing additional chip power consumption and comprising: encryption circuit and protecting circuit, where the former is used to implement function of cipher encryption algorithm and the latter is used to reduce and disorder power consumption characteristic of the former. And the safety chip further comprises control circuit to control ON-OFF of the protecting circuit. And the safety chip transfers energy by capacitor charging and discharging and can use the control circuit to control the protecting circuit to be switched on only when the encryption circuit runs. And these can reduce the safety chip power consumption and besides, achieve the purpose of preventing energy attack.

Description

technical field [0001] The invention relates to the technical field of integrated circuit security, in particular to a security chip. Background technique [0002] Security chip refers to an integrated circuit chip with encryption technology, which is widely used in digital signature, identity authentication, information encryption and other fields. Existing security chips generally include one or more encryption algorithms, some of which are implemented in software, and some are implemented in hardware. [0003] An attack method that does not destroy the encryption algorithm of the integrated circuit chip to obtain the ciphertext or key is the energy attack. The manufacture of integrated circuits uses a large number of CMOS (Complementary Metal-Oxide-Semiconductor Transistor, Complementary Metal Oxide Semiconductor) tubes, which leads to different energy consumption for executing different instructions. In addition, the storage of 0 or 1 can also reflect the difference in...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that you must be proficient in cryptographic theory, design your own cryptographic algorithm, and not be known by others

Currently commonly used DES, 3DES, RSA and other algorithms are difficult to use this method

[0007] The third is to add random power consumption circuit

The disadvantage of this method is that the random power consumption circuit produces a randomly changing power consumption current, and its current must be equal to or greater than the power consumption of the original circuit in order to submerge the current characteristics of the original circuit, and the random power consumption circuit is always in the In the working state, a large additional power consumption current will be added; if the peak values ​​of the two currents are superimposed together, the instantaneous power consumption current will be very large

These are not conducive to the application and system design of security chips

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