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dc.contributor.advisor이향숙-
dc.contributor.author정경미-
dc.creator정경미-
dc.date.accessioned2016-08-26T04:08:19Z-
dc.date.available2016-08-26T04:08:19Z-
dc.date.issued2015-
dc.identifier.otherOAK-000000110973-
dc.identifier.urihttp://dspace.ewha.ac.kr/handle/2015.oak/212559-
dc.identifier.urihttp://dcollection.ewha.ac.kr/jsp/common/DcLoOrgPer.jsp?sItemId=000000110973-
dc.description.abstractSecurity analysis on the NTRUEncrypt public key cryptosystem is mainly based on the hardness of lattice problems in a special form of lattices, called Coppersmith-Shamir basis. In this thesis, we present our Coppersmith-Shamir basis customized lattice reduction algorithm to find a short vector which can be work as a decryption key. Since Coppersmith-Shamir basis has ideal lattice like structure in the bottom part, we applied our Simplified Reuse technique to that part and obtained the improved complexity compared to the LLL algorithm.;NTRUEncrypt라는 암호시스템에서의 안전성 분석은 쿠퍼스미스-샤미르라고 불리는 기저로 생성되는 래티스에서의 어려운 문제에 기반을 두고 있다. 이 논문에서는 쿠퍼스미스-샤미르 기저에 맞춰진 lattice basis reduction 알고리즘을 제안하였다. 이 알고리즘은 쿠퍼스미스-샤미르 기저가 밑의 절반 부분에서 아이디얼 래티스 모양을 갖는 특성을 이용하여 Simplified Reuse technique을 적용하였고, 기존에 제안된 LLL 알고리즘보다 개선된 복잡도를 얻게 되었다.-
dc.description.tableofcontents1 Introduction 1 2 Lattice 3 2.1 Lattice Problems 11 2.2 Ideal Lattice 12 3 The NTRUEncrypt Cryptosystem 15 3.1 The NTRU Public Key Cryptosystem 16 3.2 Mathematical Hard Problems Underlying NTRU 19 3.3 NTRU Key Recovery Problem as a Hard Problem in Lattice 22 4 Basis Reduction Algorithms 25 4.1 LLL Algorithm 28 4.2 LLL Algorithm for Ideal Lattice 36 5 Main Results 42 5.1 Overview 42 5.2 Our Algorithm 43 5.3 Comparison with LLL 46 5.4 NTRU Key Recovery Attack with Our Algorithm 50 6 Conclusion and Further Works 54 References 55 국문초록 58-
dc.formatapplication/pdf-
dc.format.extent1449816 bytes-
dc.languageeng-
dc.publisher이화여자대학교 대학원-
dc.subject.ddc500-
dc.titleAn Improved Attack Algorithm on NTRU Using Modified Reuse Technique-
dc.typeMaster's Thesis-
dc.format.pagev, 58 p.-
dc.contributor.examiner김상집-
dc.contributor.examiner이윤진-
dc.contributor.examiner이향숙-
dc.identifier.thesisdegreeMaster-
dc.identifier.major대학원 수학과-
dc.date.awarded2015. 2-
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