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http://dx.doi.org/10.6109/jkiice.2017.21.7.1276

Correlation Power Analysis Attack on Lightweight Block Cipher LEA and Countermeasures by Masking  

An, Hyo-Sik (School of Electronic Engineering, Kumoh National Institute of Technology)
Shin, Kyung-Wook (School of Electronic Engineering, Kumoh National Institute of Technology)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.21, no.7, 2017 , pp. 1276-1284 More about this Journal
Abstract
Lightweight Encryption Algorithm (LEA) that was standardized as a lightweight block cipher was implemented with 8-bit data path, and the vulnerability of LEA encryption processor to correlation power analysis (CPA) attack was analyzed. The CPA used in this paper detects correct round keys by analyzing correlation coefficient between the Hamming distance of the computed data by applying hypothesized keys and the power dissipated in LEA crypto-processor. As a result of CPA attack, correct round keys were detected, which have maximum correlation coefficients of 0.6937, 0.5507, and this experimental result shows that block cipher LEA is vulnerable to power analysis attacks. A masking method based on TRNG was proposed as a countermeasure to CPA attack. By applying masking method that adds random values obtained from TRNG to the intermediate data of encryption, incorrect round keys having maximum correlation coefficients of 0.1293, 0.1190 were analyzed. It means that the proposed masking method is an effective countermeasure to CPA attack.
Keywords
Side channel attack; correlation power analysis attack; block cipher LEA; TRNG; masking technique;
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Times Cited By KSCI : 2  (Citation Analysis)
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