• Title/Summary/Keyword: Key distribution

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Mechanistic representation of the grading-dependent aggregates resiliency using stress transmission column

  • Sun, Yifei;Wang, Zhongtao;Gao, Yufeng
    • Geomechanics and Engineering
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    • v.17 no.4
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    • pp.405-411
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    • 2019
  • A significant influence of the particle size distribution on the resilient behaviour of granular aggregates was usually observed in laboratory tests. However, the mechanisms underlying this phenomenon were rarely reached. In this study, a mechanistic model considering particle breakage is proposed. It is found to be the combined effects of the coefficient of uniformity and the size range between maximum and minimum particle sizes that influences the resilient modulus of granular aggregates. The resilient modulus is found to undergo reduction with evolution of particle breakage by shifting the initial particle size distribution to a broader one.

Multi-Server Authenticated Key Exchange Protocol (다중서버를 이용한 인증된 키교환 프로토콜)

  • 이정현;김현정;이동훈
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.13 no.1
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    • pp.87-97
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    • 2003
  • In this paper, we define two security concepts, “non-computable security” and “distribution security”, about authentication information committed to a authentication server without any trustee, and propose an authenticatied key exchange protocol based on password, satisfying “distribution security”. We call it MAP(Muti-Server Authentication Protocol based on Password) and show that SSSO(Secure Single Sign On) using MAP solves a problem of SSO(Single Sign On) using authentication protocol based on password with a trustee.

A Secure Asymmetric Watermarking to the Public Key Attack (공개키 공격에 안전한 비대칭 워터마킹)

  • Li, De;Kim, Jong-Weon;Choi, Jong-Uk
    • Journal of the Korea Society of Computer and Information
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    • v.13 no.7
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    • pp.173-180
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    • 2008
  • In this paper, we proposed an algorithm for an effective public key and private key generation to implement a secure asymmetric watermarking system against the public key attack. The public key and private key generation is based on the linear transformation using a special matrix and the keys are designed to be able to have high correlation value. We also proposed a counter plan of public key attack. This method uses a multiple public key generation and distribution. As the results, the correlation value between the public key and the private key is high in the watermarked image. After the public key attack. this can detect the correlation by using other public key.

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Privacy Amplification of Quantum Key Distribution Systems Using Dual Universal Hush Function (듀얼 유니버셜 해쉬 함수를 이용한 양자 키 분배 시스템의 보안성 증폭)

  • Lee, Sun Yui;Kim, Jin Young
    • Journal of Satellite, Information and Communications
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    • v.12 no.1
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    • pp.38-42
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    • 2017
  • This paper introduces the concept of a dual hash function to amplify security in a quantum key distribution system. We show the use of the relationship between quantum error correction and security to provide security amplification. Also, in terms of security amplification, the approach shows that phase error correction offers better security. We describe the process of enhancing security using the universal hash function using the BB84 protocol, which is a typical example of QKD. Finally, the deterministic universal hash function induces the security to be evaluated in the quantum Pauli channel without depending on the length of the message.

Electricity Consumption Information Transmission Protocol with ID-based Key Distribution Method (ID 기반 키 분배 기법을 활용한 전력사용량 정보 전송 프로토콜)

  • Jung, Su-Young;Kwak, Jin
    • Journal of Advanced Navigation Technology
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    • v.16 no.4
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    • pp.709-716
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    • 2012
  • Recently, smartgrid has interested in enable to existing electrical grid to supplying stably and efficient energy management. Smartgrid environment using PLC is transmit PLC module collected electricity consumption information in each house from PLC module to server. This communication process can occurred security threats such as personal information leak of consumer, electrical grid paralysis. In this paper, we propose efficient electricity consumption information transmission protocol with ID-based key distribution method for respond to security threats.

A simplified directly determination of soil-water retention curve from pore size distribution

  • Niu, Geng;Shao, Longtan;Sun, De'an;Guo, Xiaoxia
    • Geomechanics and Engineering
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    • v.20 no.5
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    • pp.411-420
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    • 2020
  • Numbers fitting-curve equations have been proposed to predict soil-water retention curve (SWRC) whose parameters have no definitude physical meaning. And these methods with precondition of measuring SWRC data is time-consuming. A simplified directly method to estimate SWRC without parameters obtained by fitting-curve is proposed. Firstly, the total SWRC can be discretized into linear segments respectively. Every segment can be represented by linear formulation and every turning point can be determined by the pore-size distribution (PSD) of Mercury Intrusion Porosimetry (MIP) tests. The pore diameters governing the air-entry condition (AEC) and residual condition (RC) can be determined by the PSDs of MIP test. The PSD changes significantly during drying in SWR test, so the determination of AEC and RC should use the PSD under corresponding suction conditions. Every parameter in proposed equations can be determined directly by PSD without curve-fitting procedure and has definitude physical meaning. The proposed equations give a good estimation of both unimodal and bimodal SWRCs.

A DoS Detection Method Based on Composition Self-Similarity

  • Jian-Qi, Zhu;Feng, Fu;Kim, Chong-Kwon;Ke-Xin, Yin;Yan-Heng, Liu
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.6 no.5
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    • pp.1463-1478
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    • 2012
  • Based on the theory of local-world network, the composition self-similarity (CSS) of network traffic is presented for the first time in this paper for the study of DoS detection. We propose the concept of composition distribution graph and design the relative operations. The $(R/S)^d$ algorithm is designed for calculating the Hurst parameter. Based on composition distribution graph and Kullback Leibler (KL) divergence, we propose the composition self-similarity anomaly detection (CSSD) method for the detection of DoS attacks. We evaluate the effectiveness of the proposed method. Compared to other entropy based anomaly detection methods, our method is more accurate and with higher sensitivity in the detection of DoS attacks.

Quantum Key Distribution System integrated with IPSec (양자키분배와 IPSec을 결합한 네트워크 보안 장치 연구)

  • Lee, Eunjoo;Sohn, Ilkwon;Shim, Kyuseok;Lee, Wonhyuk
    • Convergence Security Journal
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    • v.21 no.3
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    • pp.3-11
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    • 2021
  • Most of the internet security protocols rely on classical algorithms based on the mathematical complexity of the integer factorization problem, which becomes vulnerable to a quantum computer. Recent progresses of quantum computing technologies have highlighted the need for applying quantum key distribution (QKD) on existing network protocols. We report the development and integration of a plug & play QKD device with a commercial IPSec device by replacing the session keys used in IPSec protocol with the quantum ones. We expect that this work paves the way for enhancing security of the star-type networks by implementing QKD with the end-to-end IP communication.

An authenticated key distribution protocol for the CDMA mobile communication network (부호 분할 다중 접속 이동 통신망을 위한 인증 키 분해 프로토콜)

  • Hak S. Jeon;Dong K. Kim
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.7 no.2
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    • pp.43-54
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    • 1997
  • In this paper, we introduce a secure and minimal protocol for authenticated key distribution over the CDMA mobile communication network. The CDMA mobile communication network has been developed the security protocol that provides a means for user authentication and subsequent protection of user traffic. However, this model has no security assumptions for the intermediate, fixed networks. To avoiding these drawbacks, we introduce a minimal authenticated key distribution protocol. This protocol provides the security of the intermediate and fixed network in mobile environment, and maintains the confidentiality of user identification and the minimum size of information flow compared with the existing protocols.

Improving The Security Of Quantum Key Distribution And Quantum Authentication By Using CHSH Inequality (CHSH 부등식을 이용하여 양자 키 분배와 양자 인증의 안전성을 개선한 프로토콜)

  • Heo, Jin-O;Hong, Chang-Ho;Lim, Jong-In;Yang, Hyoung-Jin
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.18 no.4
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    • pp.69-78
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    • 2008
  • We propose to analyze a weakness of quantum key distribution and quantum authentication which use entangled state were proposed by Bao-sen Shi(2001) and to improve the security of the protocol. The existing protocol had a weakness against an impersonation attack of an eavesdropper, because of a only process which authenticated a third party(Center) by users. In this paper, we propose improving the security of the protocol that authenticates users by a third party using check mode which applies CHSH inequality.