Improved Authenticated Multi-Key Agreement Protocol

Zhou et al give an attack on Ham＇s modified authenticated multi-key agreement protocol, and give a protocol that can prevent the unknown key-share attack. The paper points out that the protocol is vulnerable to a concatenation attack. This paper proposes an improved authenticated multi-key agreement protocol which shows how to make Harn＇s protocol more secure by modifying the signature and verification. And this protocol can escape the concatenation attack.     

在重点行业中实现污染物减排的途径

针对现有污染问题,结合各地的实际情况,提出在重点行业中实现污染物减排的途径。     

一种基于密钥分解理论的文件安全分割算法

提出了密钥分解问题的向量空间投影理论,由此给出了密钥分解算法,并且将该理论和算法引入文件分割问题的研究中,给出了一种应用于实际保密场合的文件安全分割及恢复算法,实现了将文件分割成n个子文件,而从其中任意m(1≤m≤n)个子文件恢复原文件的功能,为重要文件的存储和传输提供了安全保证.最后对在通信保密中实现信息的分解保密提出了建议.     

基于关键技术人员离职引发组织知识流失的离职研究视角

知识资源是企业核心能力的关键要素,关键技术员工是企业知识资源的重要载体。企业关键技术人员离职造成的企业知识流失问题,开始成为影响企业(尤其是知识密集型企业)生存与发展的重要问题。就此,对雇员离职和组织知识管理领域的理论研究进展分别进行评述,并指出当前雇员离职研究体系应根据关键技术员工特征及其离职对组织知识流失的影响做出相应拓展。     

Provable Efficient Certificateless Group Key Exchange Protocol

Certificateless public key cryptography （CL-PKC） avoids the inherent escrow of identity-based cryptography and does not require certificates to guarantee the authenticity of public keys. Based on CL-PKC, we present an efficient constant-round group key exchange protocol, which is provably secure under the intractability of computation Diffie-Hellman problem. Our protocol is a contributory key exchange with perfect forward secrecy and has only two communication rounds. So it is more efficient than other protocols. Moreover, our protocol provides a method to design efficient constant-round group key exchange protocols and most secret sharing schemes could be adopted to construct our protocol.     

Escrow-Free Certificate-Based Authenticated Key Agreement Protocol from Pairings

Key agreement protocols are essential for secure communications. In this paper, to solve the inherent key escrow problem of identity-based cryptography, an escrow-free certificate-based authenticated key agreement （CB-AK） protocol with perfect forward secrecy is proposed. Our protocol makes use of pairings on elliptic curves. The protocol is described and its properties are discussed though comparison with Smart＇s protocol.     

Two-Party Authenticated Key Agreement in Certificateless Public Key Cryptography

0 Introduction To simplify the management of certificates of tradi- tional PKI, Shamir[1] proposed the identity-based public key cryptography (ID-PKC) in which the public key of each party is derived directly from certain aspects of its identity, for exam…     

锁钥加工专用设备数控系统研究

介绍了Q18型锁具钥匙片专用数控加工系统，内容包括：数控系统的结构组成，可编程控制器（PLC)程序设计及上位机应用软件的设计等。     

师专《中国地理》教学探讨

《中国地理》是高校地理系必修的一门主干课程 ,也是学生了解国情的重点课程 .该课程教学质量的好坏 ,将关系到学生能否成为一名合格的中学地理教师 .文章针对师专学生学习《中国地理》的态度与现状 ,并就如何建立融洽的师生关系 ,提高学生学习的兴趣 ,巧用电教媒体 ,激发学生的求知欲及爱国主义情感 ,培养学生的创新能力等提出自己的观点     

气固流化床密度和床高的测控

在对气固流化床选煤系统被控对象特性分析研究的基础上,提出了用逆控制方法解决具有非线性多变量特点的气固流化床密度和床高的控制问题,建立了相关数学模型,介绍了流化床密度及床高逆系统控制方法,并获得较好的控制精度.