分裂认证码与纠错码

引入I-t-分裂认证码的概念。由有分裂的认证码得到纠错码,说明了当替换攻击成功的极大概率等于冒充攻击成功的极大概率时,信源数随编码规则数增大成线性增加,这一结论在无分裂认证码的情况下也成立。     

一个新的二进前向多层网学习算法及布尔函数优化实现

本文首先给出二进前向多层网几何学习算法的一个改进策略,提高了原算法的学习效率,然后同个新的神经网络启发式遗传几何学习算法。ＨＧＧＬ算法采用面向知识的交叉算子和变异算子对几何超平面进行优化的划分,同时确定隐层神经元的个数及连接权系数和阈值,对任意布尔函数,ＨＧＧＬ算法可获得迄今为止隐节点数量少的神经网络结构。     

具有完善机密性的可证实电子邮件协议

本文提出了一个具有完善保密性的可证实电子邮件协议ＰＣＣＭＰ,它不仅具有文（１）中协议的安全性,而且为电子邮件提供了完善的机密性,使包括邮局在内的任何第三方都不能了解电子的邮件的内容。     

基于前向多层神经网络的分组码译码器设计

把最大相关译码与神经网络神经元的内积特性及吸引域有机地联系起来,连接权决定译码码字,阈值设定决定神经元的纠错范围,从而形成一种可用于硬判决及软判决译码的神经译码器,并在理论上证明了此译码器可在ＤＭＣ信道的纠错能力范围内实现零错误概率硬判决译码,也可实现与最小欧几里德距离译码相当的软判决译码,并能在检错范围内检错。     

基于危险理论的无线传感器网络入侵检测模型

针对无线传感器网络入侵检测技术面临的挑战,利用了人工免疫技术的基本原理,提出一种基于危险理论的入侵检测模型。模型采用了分布式合作机制,与采用混杂模式监听获取全局知识的方法相比,在检测性能和能耗上都具有优势。仿真结果表明,相比于传统的单一阈值Watchdog算法和自我非我(SNS)模型,基于危险理论的检测模型能够提供较高的检测率和较低的误检率,并且有效降低了系统的能耗。     

Deterministic Joint Remote Preparation of an Arbitrary Two-Qubit State Using the Cluster State

Recently, deterministic joint remote state preparation (JRSP) schemes have been proposed to achieve 100% success probability. In this paper, we propose a new version of deterministic JRSP scheme of an arbitrary two-qubit state by using the six-qubit cluster state as shared quantum resource. Compared with previous schemes, our scheme has high efficiency since less quantum resource is required, some additional unitary operations and measurements are unnecessary. We point out that the existing two types of deterministic JRSP schemes based on GHZ states and EPR pairs are equivalent.     

An Economical Scheme for Cloning an Unknown M-Qudit Equatorial-Like State with Assistance

We propose a scheme to realize quantum cloning of an unknown M-qudit equatorial-like entangled state. The first stage of the protocol requires teleportation. After the teleportation is accomplished, the receiver can reestablish the original state. In the second stage of the protocol, with the assistance （through a single-particle projective measurement） of the preparer, the perfect copy of an original state can be produced at the site of the sender. Our scheme requires a single maximally entangled qudit pair as the quantum channel and three dits classical communication. The scheme is feasible at the expense of consuming local resources which include M - 1 ancillary qudits introduced by the receiver and additional bi-qudit operations. Moreover, we construct a sort of unitary transformations which ensure ancillary qudits are not necessarily introduced by the sender. Comparing to the previous protocols, the proposed protocol is economical due to that the cost of both quantum nonlocal resources and classical communication is lowest.     

衰落信道下卷积码的软判决译码

本文将交织、信道输出软信息、信道特征软信息相结合,研究Rayleigh衰落信道下卷积码的Viterbi软判决译码,在利用和不利用信道状态信息(CSI)两种情况下给出软判决的支路度量计算公式和性能仿真结果,计算了卷积码的性能上界;研究了解调器输出量化门限(量化级数目、量化间距)对译码性能的影响.结果与硬判决译码及AWGN信道的相关结论进行了比较.     

基于零知识证明的电子现金

在零知识证明系统的基础上提出了一种不同于以往的构造电子现金的方案。它不基于特定的盲签名方案和零知识证明系统,从而提供了基于任意零知识证明系统和盲签名方案构筑电子现金的方法。在合理的密码学假设前提下,证明了方案的安全性。     

透明安全电子邮件系统的研究与设计

本文提出了一种透明的安全电子邮件系统,该系统结构简单,实现方式灵活.该系统可实现对各种上层邮件客户端软件的完全透明的安全处理.