协作频谱感知可以提高频谱感知的可靠性,但易遭到篡改感知数据(Spectrum Sensing Data Falsification,SSDF)攻击。该文利用SSDF攻击特征,判断邻居节点发送值是否是恶意状态值,并提出一种加权分布式协作频谱感知算法。该算法根据状态值...协作频谱感知可以提高频谱感知的可靠性,但易遭到篡改感知数据(Spectrum Sensing Data Falsification,SSDF)攻击。该文利用SSDF攻击特征,判断邻居节点发送值是否是恶意状态值,并提出一种加权分布式协作频谱感知算法。该算法根据状态值在本地节点网络中的偏离程度,设定其融合权值。仿真结果表明,所提算法在节点收敛率和鲁棒性两方面,比基于梯度的协作频谱感知算法和基于最大差值的协作频谱感知算法都有所提升,检测性能也因此显著提高。展开更多
Cognitive radio has been designed for solving the problem of spectrum scarcity by using the spectrum of primary users who don’t use their spectrum on that time. For sensing the spectrum, collaborative spectrum sensin...Cognitive radio has been designed for solving the problem of spectrum scarcity by using the spectrum of primary users who don’t use their spectrum on that time. For sensing the spectrum, collaborative spectrum sensing has been utilized because of robustness. In this paper, a new collaborative spectrum method is proposed based on Least Mean Square (LMS) algorithm. In this scheme, the weights of secondary users were updated in time and finally the sensing results were combined in the fusion center based on their trusted weights. Simulation results show that the proposed scheme can significantly reduce the effects of Spectrum Sensing Data Falsification (SSDF) attackers, when they are smart malicious, and even percentage of malicious users are more than trusted users.展开更多
电磁频谱战中的攻击方式主要存在三种:干扰、窃听和欺骗。现有的研究主要基于干扰和窃听,对欺骗攻击考虑较少。欺骗攻击中一种常见的攻击方式为频谱数据篡改(Spectrum Sensing Data Falsification,SSDF)攻击。在SSDF攻击中,恶意用户假...电磁频谱战中的攻击方式主要存在三种:干扰、窃听和欺骗。现有的研究主要基于干扰和窃听,对欺骗攻击考虑较少。欺骗攻击中一种常见的攻击方式为频谱数据篡改(Spectrum Sensing Data Falsification,SSDF)攻击。在SSDF攻击中,恶意用户假扮正常的感知用户,篡改频谱数据,发起欺骗攻击。针对频谱数据篡改攻击,从攻击手段、攻击者占的比重和攻击策略三个方面进行性能分析。仿真结果表明,该攻击模型是可靠的、有效的、普适的。展开更多
协作频谱感知是认知无线电通信的重要环节,频谱感知数据篡改(Spectrum Sensing Data Falsification,SSDF)是协作频谱感知面临的严重安全威胁。SSDF攻击方式逐渐呈现智能化的趋势。变策略SSDF攻击行为是一种新的智能攻击方式,它通过改变...协作频谱感知是认知无线电通信的重要环节,频谱感知数据篡改(Spectrum Sensing Data Falsification,SSDF)是协作频谱感知面临的严重安全威胁。SSDF攻击方式逐渐呈现智能化的趋势。变策略SSDF攻击行为是一种新的智能攻击方式,它通过改变自己的攻击参数,时而伪装成诚实用户,时而发起SSDF攻击,对协作频谱感知会造成更严重的破坏。而目前针对SSDF攻击方式的传统检测算法,都假定其攻击参数始终保持不变。为了应对变策略SSDF攻击方式,提出了一种基于滑动窗的时域非相关信誉值机制,能够在攻击时刻开始之后,迅速准确检测出恶意用户。展开更多
In distributed cognitive radio （CR） network, the cooperative spectrum situation sensing based on consensus scheme may be disrupted by spectrum sensing data falsification （SSDF） attacks. In this paper, a secure spe...In distributed cognitive radio （CR） network, the cooperative spectrum situation sensing based on consensus scheme may be disrupted by spectrum sensing data falsification （SSDF） attacks. In this paper, a secure spectrum situation fusion scheme based on reputation is proposed to counter attacks. The neighboring nodes of secondary users （SUs） get the corresponding dynamic trust value according to their behavior, which restrict the impact of the malicious behavior on the premise to ensure information interaction of normal nodes. Theoretical analysis and simulation results show that the consensus fusion scheme based on reputation has better performance than the existing algorithm which eliminates the neighboring node with the biggest deviation value from mean value. It demonstrates that the proposed scheme not only achieves better convergence properties but also has higher detection probability than the existing scheme in the process of spectrum situation fusion.展开更多
文摘现有的基于证据理论的合作频谱感知认为所有认知用户都是诚实的,没有考虑恶意用户的存在。当恶意用户篡改本地感知的结果,发送错误的数据到数据融合中心,将会降低合作频谱感知的性能,这种攻击称为频谱感知数据篡改(spectrum sensing data falsification,SSDF)攻击。由于恶意用户发送的证据与其它认知用户的证据存在差别,本文使用Jousselme距离来衡量证据的可信度,提出一种SSDF攻击检测算法。数据融合中心接收所有认知用户的证据,让可信度低的证据不参与融合判决,可信度高的证据根据可信度进行加权融合。仿真结果表明,所提出的SSDF攻击检测算法在恶意用户发起SSDF攻击时可以很好的改善频谱感知性能。
文摘协作频谱感知可以提高频谱感知的可靠性,但易遭到篡改感知数据(Spectrum Sensing Data Falsification,SSDF)攻击。该文利用SSDF攻击特征,判断邻居节点发送值是否是恶意状态值,并提出一种加权分布式协作频谱感知算法。该算法根据状态值在本地节点网络中的偏离程度,设定其融合权值。仿真结果表明,所提算法在节点收敛率和鲁棒性两方面,比基于梯度的协作频谱感知算法和基于最大差值的协作频谱感知算法都有所提升,检测性能也因此显著提高。
文摘Cognitive radio has been designed for solving the problem of spectrum scarcity by using the spectrum of primary users who don’t use their spectrum on that time. For sensing the spectrum, collaborative spectrum sensing has been utilized because of robustness. In this paper, a new collaborative spectrum method is proposed based on Least Mean Square (LMS) algorithm. In this scheme, the weights of secondary users were updated in time and finally the sensing results were combined in the fusion center based on their trusted weights. Simulation results show that the proposed scheme can significantly reduce the effects of Spectrum Sensing Data Falsification (SSDF) attackers, when they are smart malicious, and even percentage of malicious users are more than trusted users.
文摘电磁频谱战中的攻击方式主要存在三种:干扰、窃听和欺骗。现有的研究主要基于干扰和窃听,对欺骗攻击考虑较少。欺骗攻击中一种常见的攻击方式为频谱数据篡改(Spectrum Sensing Data Falsification,SSDF)攻击。在SSDF攻击中,恶意用户假扮正常的感知用户,篡改频谱数据,发起欺骗攻击。针对频谱数据篡改攻击,从攻击手段、攻击者占的比重和攻击策略三个方面进行性能分析。仿真结果表明,该攻击模型是可靠的、有效的、普适的。
文摘协作频谱感知是认知无线电通信的重要环节,频谱感知数据篡改(Spectrum Sensing Data Falsification,SSDF)是协作频谱感知面临的严重安全威胁。SSDF攻击方式逐渐呈现智能化的趋势。变策略SSDF攻击行为是一种新的智能攻击方式,它通过改变自己的攻击参数,时而伪装成诚实用户,时而发起SSDF攻击,对协作频谱感知会造成更严重的破坏。而目前针对SSDF攻击方式的传统检测算法,都假定其攻击参数始终保持不变。为了应对变策略SSDF攻击方式,提出了一种基于滑动窗的时域非相关信誉值机制,能够在攻击时刻开始之后,迅速准确检测出恶意用户。
基金supported by the Key Project of National Nature Science Foundations of China (61271260)
文摘In distributed cognitive radio （CR） network, the cooperative spectrum situation sensing based on consensus scheme may be disrupted by spectrum sensing data falsification （SSDF） attacks. In this paper, a secure spectrum situation fusion scheme based on reputation is proposed to counter attacks. The neighboring nodes of secondary users （SUs） get the corresponding dynamic trust value according to their behavior, which restrict the impact of the malicious behavior on the premise to ensure information interaction of normal nodes. Theoretical analysis and simulation results show that the consensus fusion scheme based on reputation has better performance than the existing algorithm which eliminates the neighboring node with the biggest deviation value from mean value. It demonstrates that the proposed scheme not only achieves better convergence properties but also has higher detection probability than the existing scheme in the process of spectrum situation fusion.
