Analytical method designed in CPU for preventing linearity and differentiate power consumption

Abstract

This invention discloses a method for preventing linear and differential power loss analysis designed in CPU characterizing in introducing random dummy orders and control the emitting frequency of these dummy orders and each emitting numbers, at the same time, these dummy orders are used to fill in the empty places of flow lines resulted from CPU hop and transfer order, the dummy orders cost the same energy as the normal. Advantages: small logic content, not influencying key path of time sequence, allowing the code designers to select properly among the code performance.

Description

technical field [0001] The invention relates to a method designed to prevent linear and differential power analysis in a CPU. Background technique [0002] Smart card (smart card) and security key (security token) are composed of one or more integrated circuit chips, and are packaged into cards or keys that are convenient for people to carry. The integrated circuit includes a central processing unit (CPU) and a memory. Smart cards and security keys have a wide range of uses, such as electronic ID cards, telephone management systems, cable TV charging systems, security and confidentiality systems for operating personnel employment certificates, social medical insurance application management systems, electronic wallet systems, and credit cards, etc. Due to the ubiquity of smart cards and security keys, its security becomes very important. The information carried on smart cards and security keys is generally considered more secure because their inner w...

AI Technical Summary

Problems solved by technology

The software solution cannot completely rule out the attack of power consumption analysis, it can only increase the time for the attacker to crack, and requires the programmer to have a good understanding of the CPU

Most of the hardware solutions attempt to solve the problem from outside the CPU. These solutions include: using filtered power supply, using physical layer protection layer (anti-electromagnetic radiation), introducing random noise, and introducing random interrupts

The disadvantage of these solutions is that they increase the cost and size of the smart card or security key, which is not suitable for practical applications

There are also hardware solutions that are processed by the CPU itself, but these solutions lack versatility and control over CPU performance and power consumption

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