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随机散列函数安全性与签名者作弊

通信学报 2008年第10期29卷 101-107页

作者：李志敏王励成郑世慧杨义先北京邮电大学网络与交换技术国家重点实验室信息安全中心

现有对抗碰撞散列函数的攻击,严重威胁到先'散列'再'签名'的签名算法的安全性。使用随机散列构造RMX来构造此类签名算法的安全性可以不依赖于底层散列函数的离线碰撞稳固性,但前提必须假设签名者不作弊。通过改变随机数的选取方式以及... 详细信息

现有对抗碰撞散列函数的攻击,严重威胁到先'散列'再'签名'的签名算法的安全性。使用随机散列构造RMX来构造此类签名算法的安全性可以不依赖于底层散列函数的离线碰撞稳固性,但前提必须假设签名者不作弊。通过改变随机数的选取方式以及增加消息提供者的签名验证对使用RMX算法的签名算法进行了改进,改进后的算法不需要再假定签名者是诚实的。此外,对Halevi等人提出的随机函数构造rc(M)=Hc(r|■rc(M))的安全性进行了研究,并给出了关于该构造的一个安全紧规约。

关键词：散列函数先“散列”再“签名”的数字签名算法随机散列法 RMX

Iterative selection algorithm for service composition in distributed environments

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Science in China(Series F) 2008年第11期51卷 1841-1856页

作者： SU Sen LI Fei yang fangchun state key laboratory of networking and switching technology Beijing University of Posts and Telecommunications Beijing 100876 China

In service oriented architecture （SOA）, service composition is a promising way to create new services. However, some technical challenges are hindering the application of service composition. One of the greatest challenges for composite service provider is to select a set of services to instantiate composite service with end- to-end quality of service （QoS） assurance across different autonomous networks and business regions. This paper presents an iterative service selection algorithm for quality driven service composition. The algorithm runs on a peer-to-peer （P2P） service execution environment--distributed intelligent service execution （DISE）, which provides scalable QoS registry, dynamic service selection and service execution services. The most significant feature of our iterative service selection algorithm is that it can work on a centralized QoS registry as well as cross decentralized ones. Network status is an optional factor in our QoS model and selection algorithm. The algorithm iteratively selects services following service execution order, so it can be applied either before service execution or at service run-time without any modification. We test our algorithm with a series of experiments on DISE. Experimental results illustrated its excellent selection and outstanding performance.

关键词： web service quality of service (QoS) service selection algorithm distributed QoS registry

An Early Stage Detecting Method against SYN Flooding Attacks

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China Communications 2009年第4期6卷 108-115页

作者： Sun Qibo Wang Shangguang Yan Danfeng yang fangchun state key laboratory of networking and switching technology Beijing University of Posts and Telecommunications Beijing 100876 China

Existing detection methods against SYN flooding attacks are effective only at the later stages when attacking signatures are *** this paper an early stage detecting method(ESDM) is *** ESDM is a simple but effective method to detect SYN flooding attacks at the early *** the ESDM the SYN traffic is forecasted by autoregressive integrated moving average model, and non-parametric cumulative sum algorithm is used to find the SYN flooding attacks according to the forecasted ***-driven simulations show that ESDM is accurate and efficient to detect the SYN flooding attacks.

关键词： denial-of-service attacks autoregressive integrated moving average model non-parametric cumulative sum algorithm

GPSA:A Greedy Pull-based Scheduling Approach for P2P Live Streaming under Heterogeneous Environments

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China Communications 2010年第2期7卷 42-52页

作者： Chen Wei Su Sen yang fangchun Shuang Kai state key laboratory of networking and switching technology Beijing University of Posts and Telecommunications Beijing 100876 China

Pull-based P2P live streaming is a promising solution for the large scale streaming systems, like PPStream, PPlive, due to its high scalability, low cost and high resilience. However, they usually suffer from bad delay performance. In this paper, we seek to improve the delay performance under ensuring video display quality stemming from chunk scheduling. And so we model Pull-based chunk scheduling problem as a multi-objective optimization problem to minimize the video delay and maximize video display quality in the environment of heterogeneous upload bandwidths, heterogeneous and dynamic propagation delays. Finally we put up with a greedy Pull-based scheduling approach(GPSA) to solve the optimization problem. The evaluation shows GPSA can outperform two classical chunk scheduling approaches and adapt to dynamic variance of propagation delays.

关键词： P2P live streaming pull-based scheduling heterogeneous environments delay performaDce

Edgence: A Blockchain-Enabled Edge-Computing Platform for Intelligent IoT-Based dApps

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China Communications 2020年第4期17卷 78-87页

作者： Jinliang Xu Shangguang Wang Ao Zhou fangchun yang state key laboratory of networking and switching technology Beijing University of Posts and TelecommunicationsBeijing 100876China

Nowadays scalable Io T management is a bottleneck of Io T development due to the geographically dispersed distribution, fragmented ownerships, and ever-growing population of Io T devices. To intelligently manage massive decentralized applications(d Apps) in Io T usecases, Edgence(EDGe + intellig ENCE) is proposed to use edge clouds to access Io T devices and users, and then use its in-built blockchain to realize self-governing and self-supervision of the edge clouds. Edgence proposes to use masternode technology to introduce Io T devices and users into a closed blockchain system, which can extend the range of blockchain to Io T-based d Apps. Further, masternodes do good to scalability by raising the TPS(transactions per second) of the blockchain network. To support various d Apps, a three-tier validation is proposed, namely script validation, smartcontract validation, and masternode validation. To avoid energy consumption resulted by blockchain consensus, Edgence proposes a random but verifiable way to elect a masternode to generate each new block. The potential of the tailored Edgence is shown by examples of decentralized crowdsourcing and AI training.

关键词： mobile edge computing IoT crowd-intelligence blockchain dApp

Hybrid QoS-aware semantic web service composition strategies

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Science in China(Series F) 2008年第11期51卷 1822-1840页

作者： yang fangchun SU Sen LI Zhen state key Lab of networking & switching Beijing University of Posts & Telecommunications Beijing100088 China

Hybrid QoS model which consists of certain and uncertain expressions has strong power of semantic QoS description. For solving the hybrid QoS-aware semantic web service composition problem, this paper presents an Uncertain Multi-attribute decision making based Composition algorithm （UMC）. The UMC includes two parts. First, UMC-Core can be used to synthetically evaluate the hybrid service quality information. Second, UMC-DH （Distributed and Heuristic framework for UMC） aims at enhancing the run-time performance of UMC when the problem space increases. The simulation results show that the UMC has lower execution cost, higher approximation ratio and success ratio than other similar approaches.

关键词： quality of service (QoS) semantic web service service composition theory of uncertainties multi-attribute decision making theory heuristic algorithm

Group key Management Using key Graphs in ID-Based Cryptosystem

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Group Key Management Using Key Graphs in ID-Based Cryptosyst...

Charge-Based Low Priority Congestion Control

中国电子学会第十五届信息论学术年会暨第一届全国网络编码学术年会

作者： Zhao Ziming Li Hui yang Yixian Niu Xinxin Information Security Center,state key laboratory of networking and switching technology Beijing University of Posts and Telecommunications Beijing,P.R.China,100876

Many newly emerging applications in ID-based cryptosystem are based on group communication *** this paper, we present a hierarchical group key management scheme in an ID-Based cryptosystem *** the proposed scheme,we construct a provable secure group key distribution protocol using bilinear *** security of the proposed scheme is based on the assumption of the bilinear Diffie-Hellman *** the paper presents,our scheme is also scalable and efficient.

关键词： Identity-based cryptosystem Group communication Bilinear pairing Bilinear Diffie-Hellman problem

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Charge-Based Low Priority Congestion Control

Protocol-Based Non-Fragile state Estimation for Delayed Recurrent Neural Networks Subject to Replay Attacks

2008 11th IEEE International Conference on Communication technology(ICCT2008)

作者： Chi WANG Hongbo Wang Yu Lin and Shanzhi Chen Chunguang Wu state key laboratory of networking and switching technology Beijing University of Posts and Telecommunications Beijing 100876 China Dalian University of technology Dalian 116024 Liaoning China

With the best-effort TCP transporting foreground traffic,below-best-effort transport protocols are developed to transport background ***,we argue in this paper that:1) two fixed levels of priority are not enough,and 2) the background and foreground transfers are subjective concepts which can only be decided by users but not arbitrarily determined by the network according to the application type of the *** we propose the charge-based low priority congestion control（TCP-CBLP）,an algorithm not only provide multiple flexible priority levels lower than best-effort TCP,but also helps users allocating their available bandwidths effectively to optimize their *** results show that the algorithm is fair,stable,and can optimize users’ utilities.

关键词： congestion control low priority congestion pricing background traffic utility function

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IEEE/CAA Journal of Automatica Sinica 2024年第1期11卷 249-251页

作者： Fan yang Hongli Dong Yuxuan Shen Xuerong Li Dongyan Dai the Artificial Intelligence Energy Research Institute Northeast Petroleum UniversityDaqing 163318 the Heilongjiang Provincial key laboratory of networking and Intelligent Control Northeast Petroleum UniversityDaqing 163318 the Sanya Offshore Oil&Gas Research Institute Sanya 572025China IEEE

Dear Editor, This letter focuses on the protocol-based non-fragile state estimation problem for a class of recurrent neural networks(RNNs). With the development of communication technology, the networked systems have ... 详细信息

关键词： network communication estimation