The forking problem plays a key role in the security issue,which is a major concern in the blockchain system.Although many works studied the attack strategy,consensus mechanism,privacy-protecting and security performa...The forking problem plays a key role in the security issue,which is a major concern in the blockchain system.Although many works studied the attack strategy,consensus mechanism,privacy-protecting and security performance analysis,most of them only address the intentional forking caused by a malicious attacker.In fact,without any attacker,unintentional forking still remains due to transmission delay and failure,especially in wireless network scenarios.To this end,this paper investigates the reason for generating unintentional forking and derives the forking probability expression in Wireless Blockchain Networks(WBN).Furthermore,in order to illustrate the unintentional forking on the blockchain system,the performances in terms of resource utilization rate,block generation time,and Transaction Per Second(TPS)are investigated.The numerical results show that the target difficulty of hash algorithm in generating a new block,the delay time of broadcasting,the network scale,and the transmission failure probability would affect the unintentional forking probability significantly,which can provide a reliable basis for avoiding forking to save resource consumption and improving system performance.展开更多
区块链技术对保证工业物联网(Industrial Internet of Things,IIoT)的数据安全性、可信度和透明度至关重要,推动了物联网(Internet of Things,IoT)设备之间的信任和安全交互,加速了工业自动化和智能化的发展。针对区块链在IIoT中的部署...区块链技术对保证工业物联网(Industrial Internet of Things,IIoT)的数据安全性、可信度和透明度至关重要,推动了物联网(Internet of Things,IoT)设备之间的信任和安全交互,加速了工业自动化和智能化的发展。针对区块链在IIoT中的部署优化面临网络拓扑动态复杂和无线节点能量受限等问题,提出了一种利用图卷积神经网络(graph convolutional neural network,GCN)的无线节点传输功率计算框架。通过拟合大量实验数据得到传输功率和时延之间的关系函数,引入能耗、分叉率、时延、算力等因素构建关于节点传输功率的系统效用最优化问题。经过训练后,GCN基于节点哈希算力、网络拓扑图、区块链出块间隔和区块大小等信息,可快速确定无线区块链节点最优传输功率,以提高IIoT区块链的系统能效和部署时效。实验结果表明,在复杂无线IoT环境下,所提方法能高效得到理想的无线区块链节点传输功率值,与最优值之间的平均相对偏差小于1.81%。展开更多
针对无线体域网(Wireless Body Area Networks,WBAN)传感器数据在传输和存储过程中容易遭到劫持、篡改等问题,引入了去中心化的联盟区块链技术,提出了一种应用区块链来保障体域网数据安全的方案。通过采用Hyperledger Fabric搭建联盟区...针对无线体域网(Wireless Body Area Networks,WBAN)传感器数据在传输和存储过程中容易遭到劫持、篡改等问题,引入了去中心化的联盟区块链技术,提出了一种应用区块链来保障体域网数据安全的方案。通过采用Hyperledger Fabric搭建联盟区块链,利用联盟区块链的分布式记账和共识算法来保证用户生理数据的完整性和不可篡改性;再利用身份管理机制,构建联盟通道和Private Data技术来保障数据传输的隐私性。该体域网传感器节点,也是区块链的记账节点,彼此一一对应,因此还尝试将传感器之间的通信转移至区块链上来完成。实验结果表明,在使用该方案保证传感器数据安全的同时,传感器的功耗也能维持在很低的水平。展开更多
为了保证基于体域网(Wireless Body Area Network, WBAN)的智慧医疗系统的安全性,促进其实际落地应用,提出了一种体域网内(Intra-WBAN)及体域网外(Beyond-WBAN)的系统级的双层体域网安全机制。为了保护Intra-WBAN数据的安全与隐私,设计...为了保证基于体域网(Wireless Body Area Network, WBAN)的智慧医疗系统的安全性,促进其实际落地应用,提出了一种体域网内(Intra-WBAN)及体域网外(Beyond-WBAN)的系统级的双层体域网安全机制。为了保护Intra-WBAN数据的安全与隐私,设计了一个基于双异或操作带密钥哈希链的轻量级安全传输协议(Intra-BAN Hash-based Security protocol, IBHS)并验证分析了其正确性与安全性。采用区块链确保Beyond-WBAN数据的安全存储,并对区块链系统的时延问题进行研究与仿真。仿真结果表明,共识节点数及难度位数均对系统实时性有重要影响,可根据应用的具体时延需求联合调整难度位及共识节点数目以降低时延。展开更多
基金This work was supported in part by the National Natural Science Foundation of China under Grant 61701059,Grant 61941114,and Grant 61831002in part by the Fundamental Research Funds for the Central Universities of New Teachers Project,in part by the Basic and Advanced Research Projects of CSTC(No.cstc2019jcyj-zdxmX0008)+2 种基金in part by the Chongqing Science and Technology Innovation Leading Talent Support Program(CSTCCXLJR-C201710,and CSTCCXLJRC201908)in part by Chongqing Technological Innovation and Application Development Projects(cstc2019jscx-msxm1322)in part by the Science and Technology Research Program of Chongqing Municipal Education Commission(Grant No.KJZD-K201900605).
文摘The forking problem plays a key role in the security issue,which is a major concern in the blockchain system.Although many works studied the attack strategy,consensus mechanism,privacy-protecting and security performance analysis,most of them only address the intentional forking caused by a malicious attacker.In fact,without any attacker,unintentional forking still remains due to transmission delay and failure,especially in wireless network scenarios.To this end,this paper investigates the reason for generating unintentional forking and derives the forking probability expression in Wireless Blockchain Networks(WBN).Furthermore,in order to illustrate the unintentional forking on the blockchain system,the performances in terms of resource utilization rate,block generation time,and Transaction Per Second(TPS)are investigated.The numerical results show that the target difficulty of hash algorithm in generating a new block,the delay time of broadcasting,the network scale,and the transmission failure probability would affect the unintentional forking probability significantly,which can provide a reliable basis for avoiding forking to save resource consumption and improving system performance.
文摘区块链技术对保证工业物联网(Industrial Internet of Things,IIoT)的数据安全性、可信度和透明度至关重要,推动了物联网(Internet of Things,IoT)设备之间的信任和安全交互,加速了工业自动化和智能化的发展。针对区块链在IIoT中的部署优化面临网络拓扑动态复杂和无线节点能量受限等问题,提出了一种利用图卷积神经网络(graph convolutional neural network,GCN)的无线节点传输功率计算框架。通过拟合大量实验数据得到传输功率和时延之间的关系函数,引入能耗、分叉率、时延、算力等因素构建关于节点传输功率的系统效用最优化问题。经过训练后,GCN基于节点哈希算力、网络拓扑图、区块链出块间隔和区块大小等信息,可快速确定无线区块链节点最优传输功率,以提高IIoT区块链的系统能效和部署时效。实验结果表明,在复杂无线IoT环境下,所提方法能高效得到理想的无线区块链节点传输功率值,与最优值之间的平均相对偏差小于1.81%。
文摘针对无线体域网(Wireless Body Area Networks,WBAN)传感器数据在传输和存储过程中容易遭到劫持、篡改等问题,引入了去中心化的联盟区块链技术,提出了一种应用区块链来保障体域网数据安全的方案。通过采用Hyperledger Fabric搭建联盟区块链,利用联盟区块链的分布式记账和共识算法来保证用户生理数据的完整性和不可篡改性;再利用身份管理机制,构建联盟通道和Private Data技术来保障数据传输的隐私性。该体域网传感器节点,也是区块链的记账节点,彼此一一对应,因此还尝试将传感器之间的通信转移至区块链上来完成。实验结果表明,在使用该方案保证传感器数据安全的同时,传感器的功耗也能维持在很低的水平。
文摘为了保证基于体域网(Wireless Body Area Network, WBAN)的智慧医疗系统的安全性,促进其实际落地应用,提出了一种体域网内(Intra-WBAN)及体域网外(Beyond-WBAN)的系统级的双层体域网安全机制。为了保护Intra-WBAN数据的安全与隐私,设计了一个基于双异或操作带密钥哈希链的轻量级安全传输协议(Intra-BAN Hash-based Security protocol, IBHS)并验证分析了其正确性与安全性。采用区块链确保Beyond-WBAN数据的安全存储,并对区块链系统的时延问题进行研究与仿真。仿真结果表明,共识节点数及难度位数均对系统实时性有重要影响,可根据应用的具体时延需求联合调整难度位及共识节点数目以降低时延。
