• Title, Summary, Keyword: 비밀분산

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The Distributed Authentication and Key Exchange Protocols for Smartcard (스마트카드에 적용가능한 분산형 인증 및 키 교환 프로토콜)

  • Oh Heung-Ryongl;Yoon Ho-Sun;Youm Heung-Youl
    • Journal of Internet Computing and Services
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    • v.6 no.3
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    • pp.17-30
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    • 2005
  • A PAK(Password-Authenticated Key Exchange) protocol is used as a protocol to provide both the mutual authentication and allow the communication entities to share the session key for the subsequent secure communication, using the human-memorable portable short-length password, In this paper, we propose distributed key exchange protocols applicable to a smartcard using the MTI(Matsumoto, Takashima, Imai) key distribution protocol and PAK protocol. If only one server keeps the password verification data which is used for password authentication protocol. then It could easily be compromised by an attacker, called the server-compromised attack, which results in impersonating either a user or a server, Therefore, these password verification data should be distributed among the many server using the secret sharing scheme, The Object of this paper Is to present a password-based key exchange protocol which is to allow user authentication and session key distribution, using the private key in a smartcard and a password typed by a user. Moreover, to avoid the server-compromised attack, we propose the distributee key exchange protocols using the MTI key distribution protocol, And we present the security analysis of the proposed key exchange protocol and compare the proposed protocols with the existing protocols.

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Implementation and Design of Artificial Intelligence Face Recognition in Distributed Environment (분산형 인공지능 얼굴인증 시스템의 설계 및 구현)

  • 배경율
    • Journal of Intelligence and Information Systems
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    • v.10 no.1
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    • pp.65-75
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    • 2004
  • It is notorious that PIN(Personal Identification Number) is used widely for user verification and authentication in networked environment. But, when the user Identification and password are exposed by hacking, we can be damaged monetary damage as well as invasion of privacy. In this paper, we adopt face recognition-based authentication which have nothing to worry what the ID and password will be exposed. Also, we suggest the remote authentication and verification system by considering not only 2-Tier system but also 3-Tier system getting be distributed. In this research, we analyze the face feature data using the SVM(Support Vector Machine) and PCA(Principle Component Analysis), and implement artificial intelligence face recognition module in distributed environment which increase the authentication speed and heightens accuracy by utilizing artificial intelligence techniques.

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Secure Distributed Data Management Architecture for Consumer Protection of Smart Grid (스마트 그리드의 소비자 보호를 위한 안전한 분산 데이터 관리 구조)

  • Park, Nam-Je;Song, You-Jin;Park, Kwang-Yong
    • The Journal of the Korea Contents Association
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    • v.10 no.9
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    • pp.57-67
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    • 2010
  • Smart grid technology can expand energy efficiency into the home by monitoring consumer energy usage in real time and communicating with household devices that respond to demands to shut off during periods of non-use, allowing individual consumers to control their electricity usage more effectively. But, the information collected on a smart grid will form a library of personal information, the mishandling of which could be highly invasive of consumer privacy. There will be major concerns if consumer-focused principles of transparency and control are not treated as essential design principles from beginning to end. In this paper, using. All-Or-Nothing Transform encryption mode for providing smart grid security, we propose efficient distributed data Management based on XOR operation. The contribution of this paper is to provide a secure algorithm that manages efficiently distributed data in the field of private data in smart grid environment.

Contrast Analysis According to Hierarchical Access Structure on Visual Cryptography Scheme and Its Application into Human identification (시각암호에서 계층적 접근구조에 따른 휘도분석과 식별에 응용)

  • 최창근
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.8 no.2
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    • pp.13-26
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    • 1998
  • 시각암호는 비밀화상을 share라 불리는 암호화된 형태로 분산하는 방법으로서n명의 참여자로 이루어진 잡합 p에 대하여, 각 참여자는 share로 구성된 슬라이드(transparency)를 한장씩 부여받는다. 참여자들의 인가된 부분집합은 슬라이드를 중첩시켜 시각적으로 비밀정보를 복원할 수 있지만, 다른 부분집합은 비밀 정보를 복원 할 수 없다. 이 방법은 비밀정보를 복원라기 위하여 인간의 시각 체계를 이용하므로 컴퓨터를 사용한 복잡한 연산이 필요 없는 이점이 있는 반면에 복원화상의 휘도가 손실되는 단점이 있다. 이논문에서는 참여자의 계층화를 고려한 (2, n) VCS(Visual Cryptography Scheme)를 구성하기 위한 새로운 모델을 제안하고 계층적 접근구조에 의해 휘도를 개선하는 방법을 보인다. 제안하는 방법의 효율을 평가하기 위하여 (2, n) VC로 재구성되는 화상의 휘도를 분석한다. 또한 그 응용으로서 한 장의 슬라이드로 사용자와 시스템 사이에 상호식별이 가능한 메카니즘을 제시한다.

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Design of CEK Distributed Management System for Secure DRM Key Management. (안전한 DRM 키 관리를 위한 비밀 분산 관리 시스템 설계)

  • Sung Kyung
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.9 no.2
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    • pp.390-396
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    • 2005
  • With the spread of computer and development of internet service, the varied contents and digital data has been produced, then provided. The digital contents are more efficiently able to be created, produced, provided as well as distributed, on the other hand, its own copyrights seem to be more easily broken than analogue contents due to the convenience to make copies of original contents. Therefore, protecting copyrights recently become the key issue. DRM(Digital Rights Management) is the current technology to protect digital contents from duplication but it sometimes causes problems in the key-management. In this thesis, we would first like to analyze DRM and find out some trouble in the key-management of it. Finally, we will show CDMS(CEK Distributed Management System) to improve DRM out of the key-management problem and continue to study for better key-management system with it.

A Study on Visual Cyrptography Constructions (시각암호 구성법에 관한 고찰)

  • 최창근;박상우;박지환
    • Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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    • pp.251-260
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    • 1996
  • Naor & Shamir는 시각 암호에 관한 기본 개념을 제시하고 이를 위한 구성법을 제안하고 있다. 이는 복잡한 암호학적인 계산 없이 숨겨진 비밀을 복호하는 새로운 암호형태로서 대단히 안전하고 구현이 용이하다는 장점을 가지고 있다. 본 논문에서는 (2, n)시각 비밀 분산법의 여러 방법들에 대하여 고찰한다 또한, 시각 암호의 실질적인 응용의 효과를 기대할 수 있는 농담화상에 적용하기 위한 시각 암호의 구성법과실제 구현결과를 보인다.

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A Study on Data Management for Privacy Protection in Smart Grid Environment (스마트 그리드 환경에서 개인정보 보호를 위한 데이터 관리에 관한 연구)

  • Lee, Sung-Yong;Yeo, Sang-Soo;Jung, Young-Ae
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.892-893
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    • 2013
  • 스마트 그리드 환경에서 발생하는 민감한 개인정보 데이터에 대한 보안을 통해 소비자의 개인 프라이버시를 보호 하고자 데이터 비밀분산 관련 기법을 소개한 뒤 이 기법에 대한 문제점을 설명 하고자 한다.

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Anonymous Fingerprinting Using Secret Sharing Scheme (비밀분산법을 이용한 익명성 보장 핑거프린팅 기법)

  • 용승림;이상호
    • Proceedings of the Korean Information Science Society Conference
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    • pp.365-367
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    • 2003
  • 핑거프린팅 기법은 암호학적인 기법들을 이용하여 디지털 데이터를 불법적으로 재배포한 사용자를 찾아냄으로써 디지털 데이터의 저작권을 보호한다. 익명성이 보장되는 핑거프린팅 기법은 대칭적인 기법과 달리 사용자만이 핑거프린트가 삽입된 데이터를 알 수 있고 비대칭 기법과 달리 데이터가 재배포되기 전에는 사용자의 익명성이 보장되는 기법이다. 본 논문에서는 사용자의 익명성이 보장되는 새로운 핑거프린팅 기법을 제안한다. 비밀분산법을 이용하여 사용자의 신원정보를 숨겨두었다가 재배포 발견시 조정자에게 누가 재배포하였는지 증거를 제출함으로써 재배포자의 배포 사실을 증명한다. 또한 등록시에 Schnorr 서명을 이용하여 고발된 사용자가 범행을 부인할 수 없도록 한다. 제안된 방법은 이산대수문제와 양자간 안전한 계산과정의 안전성에 근거하여 사용자의 익명성이 보장된다.

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Anonymous Fingerprinting Method using the Secret Sharing Scheme (비밀분산법을 이용한 익명성 보장 핑거프린팅 기법)

  • 용승림;이상호
    • Journal of KIISE:Computer Systems and Theory
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    • v.31 no.5_6
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    • pp.353-359
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    • 2004
  • The illegal copying and redistribution of digitally-stored information is a crucial problem to distributors who electronically sell digital data. Fingerprinting scheme is a techniques which supports copyright protection to track redistributors of electronic information using cryptographic techniques. Anonymous fingerprinting schemes, differ from symmetric fingerprinting, prevent the merchant from framing a buyer by making the fingerprinted version known to the buyer only. And the scheme, differ from asymmetric fingerprinting, allows the buyer to purchase goods without revealing her identity to the merchant. In this paper, a new anonymous fingerprinting scheme based on secret sharing is introduced. The merchant finds a sold version that has been distributed, and then he is able to retrieve a buyer's identity and take her to court. And Schnorr's digital signature prevents the buyer from denying the fact he redistributed. The buyer's anonymity relies on the security of discrete logarithm and secure two-party computations.

A Transmission-Efficient Broadcast Encryption System Based on Secret Sharing Method (비밀분산 기반의 효율적인 전송량을 갖는 브로드캐스트 암호시스템)

  • Lee, Jae Hwan;Park, Jong Hwan
    • Journal of Broadcast Engineering
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    • v.21 no.3
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    • pp.412-424
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    • 2016
  • Broadcast encryption (BE) is a cryptographic primitive that enables a sender to broadcast a message to a set of receivers in a secure channel. The efficiency of BE is measured by three factors: ciphertext transmission cost, user storage cost, and computational cost for decryption. In general, BE is applied to the environments where a large number of receivers should be accommodated, so that the transmission cost is considered as being the most important factor. In this paper, we suggest a new BE system, using Shamir's secret sharing method, which considerable reduces the transmission cost. In comparison to the previous Subset Difference (SD) system, the transmission size of our BE is longer until $r{\leq}\sqrt{n}$, but get shorter when $r{\geq}\sqrt{n}$ for number of revoked users and n number of total users. We show that the advantage can be achieved at the slight expense of both the storage and computational costs.