Dong-Guk Han

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TinyECCK: Efficient Elliptic Curve Cryptography Implementation over GF(2m) on 8-bit MICAz Mote

Seog Chung Seo, Dong-Guk Han, Seokhie Hong
IACR Cryptology ePrint Archive
2008

In this paper, we revisit a generally accepted opinion: implementing Elliptic Curve Cryptosystem (ECC) over GF (2) on sensor motes using small word size is not appropriate because XOR multiplication… (More)

A More Compact Representation of XTR Cryptosystem

Masaaki Shirase, Dong-Guk Han, Yasushi Hibino, Howon Kim, Tsuyoshi Takagi
IEICE Transactions
2008

XTR is one of the most efficient public-key cryptosystems that allow us to compress the communication bandwidth of their ciphertext. The compact representation can be achieved by deploying a subgroup… (More)

Efficient Implementation of Pairing-Based Cryptography on a Sensor Node

Masaaki Shirase, Yukinori Miyazaki, Tsuyoshi Takagi, Dong-Guk Han, Dooho Choi
IEICE Transactions
2009

Pairing-based cryptography provides us many novel cryptographic applications such as ID-based cryptosystems and efficient broadcast encryptions. The security problems in ubiquitous sensor networks… (More)

Improved Computation of Square Roots in Specific Finite Fields

Dong-Guk Han, Dooho Choi, Howon Kim
IEEE Transactions on Computers
2009

In this paper, we study exponentiation in the specific finite fields F, with very special exponents such as those that occur in algorithms for computing square roots. Here, q is a prime power, q =… (More)

Side Channel Attacks and Countermeasures on Pairing Based Cryptosystems over Binary Fields

Tae Hyun Kim, Tsuyoshi Takagi, Dong-Guk Han, Howon Kim, Jongin Lim
IACR Cryptology ePrint Archive
2006

Pairings on elliptic curves have been used as cryptographic primitives for the development of new applications such as identity based schemes. For the practical applications, it is crucial to provide… (More)

Countermeasures against Power Analysis Attacks for the NTRU Public Key Cryptosystem

Mun-Kyu Lee, Jeong Eun Song, Dooho Choi, Dong-Guk Han
IEICE Transactions
2010

New Security Problem in RFID Systems Tag Killing

Dong-Guk Han, Tsuyoshi Takagi, Howon Kim, Kyoil Chung
ICCSA
2006

Radio frequency identification systems based on low-cost computing devices is the new plaything that every company would like to adopt. The biggest challenge for RFID technology is to provide… (More)

Some Analysis of Radix-r Representations

Dong-Guk Han, Tsuyoshi Takagi
IACR Cryptology ePrint Archive
2005

We deal with the radix-r representation used for the scalar multiplication of pairing-based cryptosystems with characteristic r. Our goal of this paper is to present some invariant properties about… (More)

An efficient CRT-RSA algorithm secure against power and fault attacks

Sung-Kyoung Kim, Tae Hyun Kim, Dong-Guk Han, Seokhie Hong
Journal of Systems and Software
2011

RSA digital signatures based on the Chinese Remainder Theorem (CRT) are subject to power and fault attacks. In particular, modular exponentiation and CRT recombination are prone to both attacks.… (More)

Side Channel Attack on Ha-Moon's Countermeasure of Randomized Signed Scalar Multiplication

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