Fault Attack on a Point Blinding Countermeasure of Pairing Algorithms

Recently, Page and Vercauteren proposed a fault attack on pairing algorithms and two countermeasures against such an attack. The countermeasure uses either a random scalar or a random point to blind the input points. To defeat the countermeasure using a random point, we utilize the point addition formula on an elliptic curve. As a result, we successfully defeat the countermeasure using a random point.     

双线性插值在地磁导航中的应用

地磁导航应用中常采用插值运算来提高地磁图的精度,但目前常用的地磁图插值方法都存在计算复杂、不适于实时解算等缺点。提出用双线性插值方法进行地磁图插值,该方法原理简单、计算量小,且适于在微处理器上实时解算,为地磁导航的工程实现提供了参考。     

一个新的自认证聚合签名方案

为了克服基于身份的数字签名所固有的问题,同时解决签名在一些特殊环境中产生的效率问题,利用双线性对的技术,结合自认证签名和聚合签名的概念,提出了一个自认证聚合签名方案,该方案合并了自认证签名和聚合签名的优势。最后在随机预言模型下给出了方案的安全性证明。     

基于虚拟MIMO的TD-LTE终端省电机制

介绍了无线资源管理上行链路中的虚拟MIMO技术,分析了该技术几种常用的用户配对方案的优缺点,最后重点分析了虚拟MIMO技术在TD-LTE系统中用来提高能量有效性的可能,并提出了基于虚拟MIMO的TDLTE终端省电机制的构想。     

空间摆盘机构副元素分离预测

从空间机构学理论出发,抽象出摆盘机构的动力学模型,导出了无间隙时连杆与摆盘铰接处的运动副反力及其方向变化率,以此获得了方向变化率与运动副反力模的比值;根据比值的绝对值变化,给出了空间摆盘机构运动副元素的分离准则,得到了在主轴转角处于特定位置副元素将分离的结论。研究结果为鱼雷摆盘发动机的振动与噪声控制提供参考,并为进一步发展含间隙鱼雷摆盘机构的动力优化综合理论提供了分析方法。     

可证安全的传统公钥密码-无证书公钥密码异构聚合签密方案

异构签密可以保证异构密码系统之间数据的机密性和不可伪造性。分析现有的异构签密方案,发现它们只针对单个消息,无法实现批验证。聚合签密能够把不同用户对多个消息产生的签密密文同时发送给接收者,而且可以提供批量验证,降低验证开销。该文提出一个传统公钥密码-无证书公钥密码异构聚合签密方案,该方案不仅能够保证传统公钥密码(TPKI)和无证书公钥密码(CLPKC)系统间通信的机密性和认证性,而且聚合验证时不需要双线性对。在随机预言模型下,基于间隙双线性Diffie-Hellman困难问题、计算Diffie-Hellman困难问题和离散对数问题,证明该方案满足自适应性选择密文攻击下的不可区分性和自适应选择消息下的不可伪造性。     

一种强不可伪造无证书签名方案的密码学分析与改进

无证书密码体制是无线网络中一种非常有效安全保护工具.2016年,Hung等人提出了标准模型下一种强不可伪造性的无证书签名方案,该方案声称在抗哈希碰撞问题和计算Diffle-Hellman困难问题假设下是安全不可伪造的.事实上,该方案对类型II敌手是不安全的.本文给出对Hung等的方案的安全性分析,并证明对于类型II敌手可以伪造出合法签名,针对存在问题提出一种改进的无证书签名方案.     

Dual-proxy key-based threshold signature scheme for ship ad-hoc network

In order to solve the problem of message authentication under the conditions of the ship ad-hoc network (SANET),a signature scheme that does not depend on trusted certificate authorities and tamper-proof devices (TPD) was proposed by using the threshold proxy signature scheme and the properties of bilinear pairings.The proposed scheme used the dual-proxy key and the threshold signature mechanism to enable the ship nodes calculate the message signature in polynomial time.Moreover,the security of the scheme was also proved under the random oracle model.The performance analysis results show that the proposed scheme can meet the requirement of strong proxy signature under the premise of guaranteeing correctness,and has lower computational cost and communication cost.     

双线性插值图像放大并行算法的设计与实现

图像处理中对于图像放大常使用双线性插值算法,其运行的快慢直接关系到实时图像处理的速度．文中在多核计算机上设计了双线性插值并行程序,实现了图像放大的快速处理．充分利用多核技术提升多核处理器的资源利用率,缩短执行时间,发挥多核系统的优异性能．实验结果可看出,文中算法对于大规模图像放大呈现出良好的加速处理能力,表明了双线性插值多核并行算法在实时放大图像的应用中是有效及可行的．     

Energy efficiency based multi-relay selection and power allocation in OFDM cooperation networks

Getting along with the improvement of green communications, the energy efficiency （EE） of wireless network becomes more and more important. However, in nmlti-relay-assisted systems, the related work obviously depends on the end-to-end performance, whereas EE of relays has not attracted enough attention. The authors propose an orthogonal frequency division multiplexing （OFDM） multi-relay system based on amplify and forward （AF） mode. Taking incorporating EE and remaining energy as factor, decision criteria of attending cooperation is designed. The EE based asynchronous power iteration method is presented, and the existence and convergence of nash equilibrium （NE） is proven. Furthermore, a joint algorithm in subcarrier pairing, relay selection and power allocation is given. Genetic algorithm （GA） and iteration method are integrated to improve the convergence speed additionally. Simulation demonstrates the obvious improvement of EE, decrease of power consumption and increase of lifetime in relays of this algorithm with the constraint of minimum data transmission rate.