A side channel signal preprocessing method based on short time domain analysis

Abstract

A side channel signal preprocessing method based on short time domain analysis, includes setting up basic environment of collecting side channel signal, setting current sampling frequency of oscilloscope as f, setting clock frequency of cryptographic equipment as fs, setting operating frequency of cryptographic equipment as the number of points of collected side channel signal as M, number of pieces as N, and making signal matrix as TN*M, 2, determining the size of the window used for selecting the window function, wherein the size of the window is in units of the running clock of the cryptographic device, and the size of the window is calculated as follows: the size of the window is set as n, n=f / fs; (3) analyzing the short-time energy of the signal matrix according to the size n of the window until the calculation of each row of the signal matrix is completed; (4) after the short-time energy analysis of all rows of the matrix is completed, the new matrix T 'is obtained. The invention(1) the method for running the pretreatment can effectively improve the efficiency of the side channel attack; (2) the side channel signal is compressed effectively, which shortens the time of attackdetection.

Description

Technical field [0001] The invention relates to the field of chip security attack detection, in particular to a side channel signal preprocessing method based on short-time domain analysis. Background technique [0002] Traditional cryptanalysis focuses on the mathematical characteristics of the cryptographic algorithm itself, while ignoring the physical signals leaked by the cryptographic device during the operation of the cryptographic algorithm. Since Paul Kochers first proposed the idea of ​​using time to analyze sensitive information in cryptographic devices in 1996, side channel analysis has received great attention, and related research has become an important branch of cryptography research and has been widely used in cryptography. The attack detection area of ​​the chip. The basic principle of the side-channel attack is to collect the energy information or electromagnetic information of the cryptographic equipment during the operation, and then recover the key informati...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the invention is to propose a universal side-channel signal pre-processing method in view of the shortcomings of the current side-channel signal preprocessing method that is not flexible enough and requires a large number of parameter configurations, which effectively improves the performance of side-channel attacks. s efficiency

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