NTRU 암호에 대한 전력 분석 공격 및 대응 방법

송정은(Jeong Eun Song),한동국(Dong-Guk Han),이문규(Mun-Kyu Lee),최두호(Dooho Choi) 한국정보보호학회 2009 정보보호학회논문지 Vol.19 No.2

NTRU는 1990년대 Hoffstein 등에 의해 제안된 격자(Lattice) 기반 공개키 암호체계로서 기존의 공개키 암호와 비교하여 동일한 안전성을 제공하면서 암호화 및 복호화 속도가 빠르며 양자 연산 알고리즘을 이용한 공격에도 강하다는 이점이 있어 많은 주목을 받고 있다. 본 논문에서는 단순 전력 분석 공격과 통계적 특성을 이용한 전력 분석공격인 상관계수 전력 분석 공격에 대한 NTRU의 안전성을 분석하고, NesC로 구현한 NTRU의 연산을 Telos 모트(mote)에서 수행시켜 측정한 전력 소모 데이터에 상관계수 전력 분석 공격을 적용하여 개인키 정보를 복원하는 실험 결과를 보인다. 또한 이러한 전력 분석 공격을 방지하기 위한 대응 방법을 제시한다. 먼저, 단순 전력 분석 공격을 방지하기 위해 연산 결과를 저장할 배열을 0이 아닌 수로 초기화 시키는 방법을 제안하고, 통계적 특성을 이용한 전력분석 공격을 방지하기 위해 연산 순서를 변경하거나 컨볼루션(convolution) 연산에 사용되는 피연산자들에게 무작위성(randomness)을 부여하여 같은 입력에 대해서 랜덤한 전력 소모를 보이도록 하는 방법을 제안한다. The NTRU cryptosystem proposed by Hoffstein et al. in 1990s is a public key cryptosystem based on hard lattice problems. NTRU has many advantages compared to other public key cryptosystems such as RSA and elliptic curve cryptosystems. For example, it guarantees high speed encryption and decryption with the same level of security, and there is no known quantum computing algorithm for speeding up attacks against NTRU. In this paper, we analyze the security of NTRU against the simple power analysis (SPA) attack and the statistical power analysis (STPA) attack such as the correlation power analysis (CPA) attack. First, we implement NTRU operations using NesC on a Telos mote, and we show how to apply CPA to recover a private key from collected power traces. We also suggest countermeasures against these attacks. In order to prevent SPA, we propose to use a nonzero value to initialize the array which will store the result of a convolution operation. On the other hand, in order to prevent STPA, we propose two techniques to randomize power traces related to the same input. The first one is random ordering of the computation sequences in a convolution operation and the other is data randomization in convolution operation.

DP980강판의 레이저 조사에 따른 굽힘 변형특성 연구

송정한(J. H. Song),장야징(Y. Zhang),이종섭(J. S. Lee),박성준(S. J. Park),최두순(D. S. Choi),이근안(G. A. Lee) 한국소성·가공학회 2012 소성가공 : 한국소성가공학회지 Vol.21 No.6

기계학습을 이용한 주간 박스오피스 예측

송정아(Junga Song),최근호(Keunho Choi),김건우(Gunwoo Kim) 한국지능정보시스템학회 2018 한국지능정보시스템학회 학술대회논문집 Vol.2018 No.6

본 연구는 개봉 후 역동적으로 변화하는 영화 시장에 대해 탄력적인 대응을 할 수 있도록주차별 관객수를 예측하는데 목적을 두고있다. 분석을 위해 선행연구에서 사용되었던 요인 뿐 아니라 개봉 후 역동적으로 변화하는 영화의 흥행순위, 관객수 증가 여부 등 선행연구에서 사용되지 않았던 데이터들을 새로운 요인으로 사용하고 Random Forest, MLP, Support Vector Machine, Naive Bays등의 기계학습 기법을 이용하여 개봉 일, 개봉 1주, 개봉 2주에는 다음주 관객수를 예측하고 개봉 3주에는 최종 관객수를 예측한다. 비교를 위해 매 예측시점마다 동일한 예측 요인을 사용하여 최종관객수도 예측해보았다. 분석결과 동일한 시점에 최종 관객수를 예측 했을 경우 보다 다음주 관객수를 예측하는 것이 더 높은 정확도를 보였다. 기계학습 기법 중에는 Random Forest가 가장 높은 정확도를 보였다.

레이저 조사 판재 성형 기술

송정한(J. H. Song),이근안(G. A. Lee),박성준(S. J. Park) 한국소성·가공학회 2014 소성가공 : 한국소성가공학회지 Vol.23 No.2

남사당<풍물굿>에 내재된 현대적(現代的) 수용가치(受用價値)에 관한 연구

송정은(Jung Eun Song) 한국체육철학회 1998 움직임의철학 : 한국체육철학회지 Vol.6 No.1

Traditional Korean art should develop as the Korean people develop Our art should not be allowed to remain frozen in antiquity. A deep understanding of our traditional art forms is vital to our cultural identity and to our self expression in an era in which our future expression of identity must be built. One vital tradition is the Namsadang Poongmool-Noli, a beautiful synthesis of dance, music, and drama. A study of this art form must include a study of the Mamsadang-Pac, the originating artistic group. The Poongmool-Noli of Namsadang is a prime example of the sophistication of traditional dance and music. It is, without a doubt, the most entertaining, dynamic, and elegant of any art form created by peasants. The unique quality of the Namsadang Poongmool-Noli is the Chilche-Jangdan, a kind of rhythm. Though the rhythm is not diverse, it is powerful and dynamic. The most striking feature of any performance of the Namsadang Poongmool-Noli is that it derives its beauty from the harmony of the whole formation, rather than showcasing the skills of individual artists. The Namsadang Poongmool-Noli could be joined by the common people, though it was originally supervised by the ruling class. As time passed, however, the Poongmool-Noli became the people`s art. The Namsadang-Pae goup behaved very differently in terms of the ethics of the time. Members of the goup chose to suffer a certain amount of isolation from the traditional goup consciousness in order to wander the country practicing their art. The Namsadang-Pae`s forsook the secure identity offered thorn by family and nation and derived their identity from their art. The Namsadang Poongmool-Noli of the Namsadang Pac is a unique and intangible cultural asset. It therefore deserves the financial support of the government. The art form should be used to attract tourism and should be promoted abroad in cultural exchanges. In addition traditional artistic groups like the Namsadang-Pae should be preserved and supported by the korean government and people.

부채의 형태와 표현적 상징성에 관한 연구

송정은(Song, Jeong Eun),조남규(Cho Nam-gyu) 한국체육철학회 2003 움직임의철학 : 한국체육철학회지 Vol.11 No.2

This study is designed to analyze the shape of fans, forms of fan dances and what they stand for by observing the development of fans used in Korean dance. Thanks to the tireless research by the dance community, fans have continued to be used in traditional Korean danca through they vary in style. Even the fans used in our daily lives are also found. The role of fans in Korean dance goes beyond a mere stage-property. That is largely because they present artistic expression to the dancing. In its expreession method, the traditional Korean fan dance, known as pucheachum, showcases 1) the beauty of nature and landscape 2) the look in people`s face 3) people`s abstract emotions. Hallyangmu, the dance of depraved young noblemen, demonstrates 1) artistic expressions by the use of dynamic and static moves in sequence 2) the unique elegance and dignity of a refined seonbi, the Korean term used for a man who attained a respectable level of learning but did not hold an official government position 3) the beauty of contrast and harmony through versatile steps, which go through different rhythms. As such, fans in Korean dance have come a long way and still remain in performance arts today. As we are living in a globalized world, this study is designed to serve as basic information for people to understand more about the traditional Korean culture and to provide scientific and practical research motivations for dancing actions-the area where adequate research has not been made in the Korean artistic and cultural field.

Estimation of Hydraulic Conductivity of Soils Based on Biot’s Theory of Wave Propagation

Song, Chung R.(송정락),Kim, Jinwon(김진원),Koocheki, Kianoosh 한국지반공학회 2020 한국지반공학회논문집 Vol.36 No.12

성서적 이해를 통한 무용의 성향분석과 활성 방향 모색

송정은(Jung Eun Song) 한국체육철학회 2001 움직임의철학 : 한국체육철학회지 Vol.9 No.1

According to the Old and New Testament, Christian worship contains festive elements related to salvation. Because basically the character of dance is related with joy and festival, it`s been used as means of celebrating worship. Today, choreographers may reinterpret the characters or personalities in the Bible for their creative works. Expressing the biblical stories as performance, they also can achieve the religious and artistic purpose. Christian dancing is the way and proceed which give a glory to God through dancing. It is also the life in which we devote our talent to God. The bible offers choreographers the chance of choosing the various subjects, and helps their artistic perfection. If dancing is important and meaningful part of worship, it should be understood under more complete dimension, than the physical way. It is choreographers that should symbolize ceremony in modern movement of our life. Also, they should reinterpret and reconstruct the movement successfully. As a result, this is an aspect of Christian mission and the subject of Christian dancing in the future time.

베트남 응우옌 왕조의 과시(科試) 일고찰(一考察)

송정남 ( Song Jung Nam ) 한국외국어대학교 동남아연구소 2019 東南亞硏究 Vol.28 No.3

본고는 베트남 마지막 왕조인 응우옌(Nguyen) 왕조의 과거제도를 다루었다. 유교를 국교로 하였던 응우옌 왕조의 과거제도는 여러 면에서 발달하였다. 응우옌 왕조의 과거제도는 왕권강화와 교육 발전에 크게 기여하였다. 하지만 최초 통일왕조였던 것과 프랑스의 침략과 같은 여러 요인에 의하여 과시는 매번 불안전하게 시행되었고 마침내 1919년을 기점으로 폐지되었다. This article is about the imperial examination of the Nguyen dynasty which is the last dynasty of Vietnam. The imperial examination of the Nguyen dynasty that its national religion was Confucianism developed in many ways. The imperial examination also contributed to strengthening of royal authority and development of education. However the imperial examination had been effect unsafely because the dynasty was the first united dynasty and there were other reasons such as invasion of France. In the end it abolished since 1919.

주의력결핍 과잉행동장애에서 오로스 메칠페니데이트의 효용성

송정은(Jungeun Song),김봉석(Bongseog Kim),손정우(Jung-Woo Son),유한익(Hanik K. Yoo),이소영(Soyoung Irene Lee),한덕현(Doug Hyun Han),송동호(Dong-Ho Song) 대한소아청소년정신의학회 2012 소아청소년정신의학 Vol.23 No.S

Attention-deficit/hyperactivity disorder (ADHD) is one of the common psychiatric problems in childhood. The symptoms of ADHD tend to last for adulthood and the patients suffer from various comorbid problems and functional impairments. Methylphenidate (MPH) is the first choice of pharmacotherapy for ADHD and many researches have demonstrated its efficacy. We reviewed the clinical trials for efficacy of MPH focusing on Osmotic-Controlled Release Oral delivery System Methylphenidate (OROS MPH). It was identified that MPH improved core symptom of ADHD, peer relationship and health related quality of life and might improve various aspects of cognitive function. It was proved that the efficacy of OROS MPH was better than placebo and comparable to immediate release MPH (IR MPH) dosed three times daily in various studies. Especially, parent’s preference of OROS MPH was better than IR MPH. The efficacy of MPH for academic achievement was equivocal. Long-term efficacy of OROS MPH was also inconclusive and further study is necessary.