Chosen-IV correlation power analysis on KCipher-2 and a countermeasure

Takafumi Hibiki, Naofumi Homma, Yuto Nakano, Kazuhide Fukushima, Shinsaku Kiyomoto, Yutaka Miyake, Takafumi Aoki

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Citations (Scopus)


This paper presents a chosen-IV (Initial Vector) correlation power analysis on the international standard stream cipher KCipher-2 together with an effective countermeasure. First, we describe a power analysis technique which can reveal the secret key (initial key) of KCipher-2 and then evaluate the validity of the CPA with an experiment on an FPGA platform. This paper also proposes a countermeasure based on random masking techniques. The concept of the proposed countermeasure is to mask intermediate data which pass through the non-linear function part including integer addition, substitution functions, and internal registers L1 and L2. We design two types of masked integer adders and two types of masked substitution circuits in order to minimize circuit area and delay. The performance of the proposed method is evaluated through ASIC implementations on a 90-nm CMOS technology. In comparison to the design without a countermeasure, the circuit area and delay of the design with a countermeasure increase at most 1.5 and 2.6 times, respectively. The effectiveness of the countermeasure is also demonstrated through an experiment on the same FPGA platform.

Original languageEnglish
Title of host publicationConstructive Side-Channel Analysis and Secure Design - 4th International Workshop, COSADE 2013, Revised Selected Papers
PublisherSpringer Verlag
Number of pages15
ISBN (Print)9783642400254
Publication statusPublished - 2013
Event4th Workshop on Constructive Side-Channel Analysis and Secure Design, COSADE 2013 - Paris, France
Duration: 2013 Mar 62013 Mar 8

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume7864 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349


Conference4th Workshop on Constructive Side-Channel Analysis and Secure Design, COSADE 2013


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