Dynamic anonymous identity authentication (DAIA) scheme for VANET

With the development of the vehicular ad hoc network, the security and privacy are now becoming vital concerns, especially when the attacker owns more and more resources. In order to address these concerns, a dynamic anonymous identity authentication scheme is proposed using Elliptic Curve Discrete Logarithm Problem and blockchain method, which guarantees the security and fast off‐line authentication for vehicle‐to‐infrastructure. Specifically, a dynamic pseudonym key is generated using tamper proof device (TPD) for off‐line authentication and anonymity when a vehicle roams among different roadside units' (RSUs) communication ranges. Even if all RSUs are compromised, vehicle's identity is still privacy. Moreover, two additional design goals are more suitable for the practical environment: (1) the reduced assumption of TPD; (2) certification authority can trace vehicle under the authorization by law.     

基于区块链技术的跨域认证方案

针对现有交互频繁的信息服务信任域（PKI域和IBC域）之间不能实现信息服务实体（ISE）安全高效的跨域认证的问题,提出一种基于区块链的跨异构域认证方案.在IBC域设置区块链域代理服务器参与SM9（国产标识密码）算法中密钥生成,并与PKI域区块链证书服务器等构成联盟链模型,利用区块链技术去中心化信任、数据不易篡改等优点保证模型内第三方服务器的可信性.基于此设计了跨域认证协议与重认证协议,并进行SOV逻辑证明.分析表明,与目前相关方案相比,协议在满足安全需求的前提下,降低了用户终端的计算量、通信量和存储负担,简化了重认证过程,实现域间安全通信,在信息服务跨异构域身份认证过程中具有良好的实用性.     

Quantum Bitcoin Mining

This paper studies the effect of quantum computers on Bitcoin mining. The shift in computational paradigm towards quantum computation allows the entire search space of the golden nonce to be queried at once by exploiting quantum superpositions and entanglement. Using Grover’s algorithm, a solution can be extracted in time O(2256/t), where t is the target value for the nonce. This is better using a square root over the classical search algorithm that requires O(2256/t) tries. If sufficiently large quantum computers are available for the public, mining activity in the classical sense becomes obsolete, as quantum computers always win. Without considering quantum noise, the size of the quantum computer needs to be ≈104 qubits.     

基于多目标效用优化的分布式数据交易算法

传统的集中式数据交易模式不能很好地适用于当前万物互联、数据实时产生的智能时代,为了使产生的数据发挥更大的价值,设计一种有效的数据交易框架至关重要.为此,提出了一种基于联盟区块链的分布式数据交易框架,在不依赖第三方的情况下实现了P2P的数据交易.针对已有数据交易模型仅考虑数据本身的因素,而忽略用户任务相关因素的问题,基于...     

区块链在数字金融技术体系中的发展与挑战

数字金融是国家数字经济战略中的核心内容,持续创新是数字金融技术体系的本质属性.区块链作为数字金融技术体系中的核心技术之一,是我国数字金融领域重点应用和关注的技术方向.从数字金融的需求和问题导向出发,未来需要重点关注和突破区块链技术7个方面的挑战,包括区块链体系架构、隐私保护、监管和审计、信息安全、核心模块和技术、标准、...     

政务数据资源共享是 区块链技术自主创新的主战场

数字政府建设的重点和难点在于推进跨层级、跨地域、跨系统、跨部门、跨业务的政务数据有序共享和协同服务.区块链是一种分布式数据存储及处理技术,是密码技术与分布式技术的创新融合,以去中心化方式形成一种新的"信任"机制,基于密码技术解决身份和数据可信,基于分布式技术解决多方协同,从而打破数据流通和业务协作壁垒.以数字政府建设为...     

Survey of blockchain:principle,progress and application

Blockchain is a kind of distributed ledger technology that upgrades to a complete storage system by adding logic control functions such as intelligent contracts.With the changes of its classification,service mode and application requirements,the core technology forms of Blockchain show diversified development.In order to understand the Blockchain ecosystem thoroughly,a hierarchical technology architecture of Blockchain was proposed.Furthermore,each layer of blockchain was analyzed from the perspectives of basic principle,related technologies and research progress in-depth.Moreover,the technology selections and characteristics of typical Blockchain projects were summarized systematically.Finally,some application directions of blockchain frontiers,technology challenges and research prospects including Smart Cities and Industrial Internet were given.     

基于区块链的社会物联网可信服务管理框架

针对当前社会物联网可信服务管理中存在的中心化程度高、交易不透明和易受攻击等问题,提出了一种基于区块链的社会物联网可信服务管理框架。该框架通过区块链的去中心化特性在服务请求者和服务提供者之间直接建立信任关系,利用智能合约产生并管理新的交易,实现交易过程透明化并减少管理维护成本。同时,区块链的共识机制可用于交易验证并防范恶意攻击和篡改,减少网络攻击和恶意节点的欺骗。最后,分析了该框架在实际构建中面临的主要挑战。     

区块链在轨道交通边缘计算网络中的应用

多接入边缘计算（multi-access edge computing,MEC）能为城市轨道交通中的计算密集型业务和时延敏感型业务提供高质量的服务能力,然而轨道交通边缘计算网络中的大量边缘设施暴露在开放式环境中,其隐私保护和传输安全面临着很大的挑战。区块链（blockchain）具有分布式账本、共识机制、智能合约、去中心化应用等功能特性,因此,区块链技术可以为分布式轨道交通边缘计算网络构建系统性的安全防护机制,从而保障网络安全和数据安全,实现高质量的城市轨道交通服务。首先,介绍了区块链的基本概念;其次,设计了轨道交通边缘计算网络架构,提出了融合区块链的轨道交通边缘计算网络安全防护机制和应用实例;最后,对该安全防护机制面临的问题和挑战进行了分析和展望。     

Endogenous trusted network architecture for intelligent sharing

To address the needs of intelligent sharing of network resources,blockchain and artificial intelligence were integrated with the network,and an endogenous trusted resource intelligent sharing network architecture was proposed to make network asset sharing have endogenous trust.Based on distributed alliance blockchain,an integration mechanism of on-chain identification and off-chain resource was proposed to achieve credible management of network resources.Security and trusted sharing protocols for network data was designed to synchronize data consensus within the network.Based on smart contract,network resource scheduling and service composition methods were presented to achieve trusted service sharing.Finally,the proposed architecture was applied to decentralized scenarios such as domain name resolution,cross domain authentication,and virtual network operation.The proposed architecture realizes the integration of blockchain and network and supports the endogenous trusted sharing of network assets.