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SuiAifen LucasC.K.Hui YangYixian K.P.Chow 《电子科学学刊(英文版)》2005,22(3):268-272
Based on elliptic curve Diffie-Hellman algorithm, an Elliptic Curve Authenticated Key Agreement (ECAKA) protocol with pre-shared password is proposed. Its security relies on the Elliptic Curve Discrete Logarithm Problem (ECDLP). It provides identity authentication,key validation and perfect forward secrecy, and it can foil man-in-the-middle attacks. 相似文献
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In the literature, several dynamic ID-based remote user mutual authentication schemes are implemented using password, smartcard and Elliptic Curve Cryptography (ECC), however, none of them provides resilience against different attacks. Therefore, there is a great need to design an efficient scheme for practical applications. In this paper, we proposed such a scheme in order to provide desired security attributes and computation efficiencies. Compared with other existing techniques, our scheme is more efficient and secured. In addition, our scheme is provably secure in the random oracle model under the hardness assumption of computational Diffie-Hellman problem. 相似文献
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该文针对无线传感器网络中能量有限问题,提出了一种基于有限反馈的协同MIMO策略。该策略基于梯度算法,用1bit反馈来自动地调整簇头节点和协同簇头节点的发射功率。对无线传感器网络中基于有限反馈的Alamouti码的协同MISO系统的误码率进行了理论分析,推导了基于有限反馈Alamouti码的协同MISO策略能耗的契尔诺夫上限表达式。理论分析和仿真结果都表明,该文提出的协同MISO策略与基于标准Alamouti码的协同策略相比,无线传感器网络的总能耗更低,能效更高,且当簇头节点和协同簇头节点一直选择较好信道对应的节点来发送信息时,即最优策略,无线传感器网络的总能耗更低。 相似文献
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高效的差错控制编码技术(ECC)可以增强无线传感器网络传输稳定性、网络的能量利用效率。为了充分利用无线传感器网络中蕴含的分集资源应对恶劣信道环境导致的高差错概率,该文研究了基于根校验全分集LDPC码的差错控制编码技术。首先,提出在分簇无线传感器网络中,基于根校验全分集LDPC码的编码方案;其次,设计了适用于所提方案的速率兼容全分集LDPC码字结构。最后,分析了所提编码系统的能效。仿真结果表明,在信道条件较差的环境中(仿真中,信道噪声大于410-4 mW),采用该文的编码方案,能够显著提高无线传感器网络的能效。 相似文献
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无线传感器网络中关键节点的判定对网络抗毁性研究具有重要作用。考虑到节点能量受限,该文综合节点剩余生命期和节点移除导致的网络能耗值增加,提出一种将能量因素作为衡量节点重要程度的关键节点判定算法(CNDBE),解决了能量受限的无线传感器网络关键节点判定问题。实验结果表明,在对基于CNDBE,最短路径树算法(SPT)和能量感知的关键节点生成树算法(ENCAST)判定得到的关键节点进行保护时,CNDBE具有更强的网络抗毁性和更长的网络生命期。 相似文献
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Wireless Sensor Networks for Rainfall Monitoring (RM-WSNs) is a sensor network for the large-scale regional and moving rainfall monitoring, which could be controlled deployment. Delivery delay and cross-cluster calculation leads to information inaccuracy by the existing dynamic collaborative self-organization algorithm in WSNs. In this letter, a Local Dynamic Cluster Self-organization algorithm (LDCS) is proposed for the large-scale regional and moving target monitoring in RM-WSNs. The algorithm utilizes the resource-rich node in WSNs as the cluster head, which processes target information obtained by sensor nodes in cluster. The cluster head shifts with the target moving in chance and re-groups a new cluster. The target information acquisition is limited in the dynamic cluster, which can reduce information across-clusters transfer delay and improve the real-time of information acquisition. The simulation results show that, LDCS can not only relieve the problem of “too frequent leader switches” in IDSQ, also make full use of the history monitoring information of target and continuous monitoring of sensor nodes that failed in DCS. 相似文献
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基于压缩感知的WSNs长生命周期数据收集方法 总被引:3,自引:0,他引:3
该文针对基于事件驱动的无线传感器网络(WSNs)数据收集查询的长期应用需求,基于压缩感知理论将混合压缩感知的数据收集技术与数据收集树的构建过程相结合,设计出一种长生命周期数据收集方法。该方法在数据收集查询到达时,构造一棵数据收集树。建树过程中,利用混合压缩感知思想,在分析转发节点和融合节点能耗的基础上,以收集查询后节点最小剩余能量最大化为目标,构造最大数据收集树集合。仿真实验表明,该方法能够充分利用节点能量资源,显著提高网络能量效率,达到延长网络生命周期的目标。 相似文献
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传统的压缩感知定位方法均假设目标准确落在某一预设的固定网格上。当目标偏离该网格,所采用的字典与真实稀疏表示字典之间存在失配,导致这些方法的定位性能大大降低。针对该问题,该文提出一种面向压缩感知定位的动态字典算法。该算法将真实稀疏表示字典建模为一个以网格为参数的动态字典,从而将定位问题转化为联合稀疏重构和参数估计问题。利用一阶泰勒展开对真实稀疏表示字典进行近似,将非凸的参数优化问题松弛为凸优化问题。仿真结果表明,相比于传统的静态字典算法,该文所提出的动态字典算法具有更好的性能。 相似文献
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In this letter, a Function node-based Multiple Pairwise Keys Management (MPKMF)protocol for Wireless Sensor Networks (WSNs) is firstly designed, in which ordinary nodes and cluster head nodes are responsible for data collection and transmission, and function nodes are responsible for key management. There are more than one function nodes in the cluster consulting the key generation and other security decision-making. The function nodes are the second-class security center because of the characteristics of the distributed WSNs. Secondly, It is also described that the formation of function nodes and cluster heads under the control of the former, and five kinds of keys, I.e., individual key,pairwise keys, cluster key, management key, and group key. Finally, performance analysis and ex-periments show that, the protocol is superior in communication and energy consumption. The delay of establishing the cluster key meets the requirements, and a multiple pairwise key which adopts the coordinated security authentication scheme is provided. 相似文献
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In Wireless Sensor Networks (WSNs), it is necessary to predict computational overheads of security mechanisms without final implementations to provide guidelines for system design. This paper presents an accurate and flexible model to predict overheads of these mechanisms. This model is based on overheads of basic operations frequently used in cryptography algorithms, which are essential elements of security mechanisms. Several popular cryptography algorithms and security mechanisms are evaluated using this model. According to simulation results, relative prediction errors are less than 7% for most cryptography algorithms and security mechanisms. 相似文献
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实验测量发现WSNs的底层通信链路存在着丢失、非对称等特性;该文针对传统链路层可靠机制运用于无线传感器网络中存在着路径效率低,能量开销大的缺点,提出了一种面向效率的链路层组确认机制,并就路径效率、缓存需求、时间开销等指标进行了理论分析;最后,与传统链路层可靠传输机制在MicaZ平台上分别加以实现.测试结果表明该文提出的组确认机制的路径效率高、缓存需求固定,特别适合于高可靠,低实时要求的一类应用. 相似文献