神经密码学

神经网络是近年来得到迅速发展的国际前沿研究领域，它已成功地应用于许多学科领域。密码学是解决信息安全最有效的手段之一，是当代信息高科技热点。用人工神经网络解决计算机密码学中的问题，即神经密码学，不仅是神经网络的一个重要的应用研究领域，而且也是密码学理论研究的一个新课题。     

一种基于密钥回收的量子加密算法

基于Damgard等人的密钥回收算法，提出了一种更有效的新型量子加密算法。使用通用的哈希函数来检测窃听，如果没有监测到窃听，加解密双方共享的密钥可以被安全地重复使用，否则需要抛弃并重新协商与明文等长的密钥串。在加密经典明文的同时，也为剩余未加密的明文协商密钥。当协商好的密钥量与剩余的明文相同时，就可以使用一次一密来加密从而避免反馈是否存在窃听以及重新协商密钥的过程，显著提高了加密效率。     

The Pathology of Cryptology—A Current Survey

Abstract

“The Pathology of Cryptology” is the title of a chapter in David Kahn's book The Codebreakers. This chapter mainly deals with hidden messages, which amateur scientists claim to have discovered in the works of William Shakespeare and in other literary works. The present article picks up this subject and provides it with a theoretic framework under the name of “para-steganography.” Moreover, further case studies are added to those given by Kahn, including many examples that only became known after the publication of The Codebreakers. These considerations show that a hidden code can be found almost anywhere, provided that one looks for it in a suitable manner.     

The Modified Signature Scheme Based on Factoring and Discrete Logarithms

ABSTRACT

Laih and Kuo developed two highly secure and efficient signature schemes based on factoring and discrete logarithms. Unfortunately, their schemes require many keys for signing document and verifying signature. Li, Tzeng, and Hwang improved one of their schemes and managed to reduce the number of keys, but unfortunately the improved scheme was shown to be insecure by Qian, Chao, and Bao. In this paper, a new modified scheme of Li-Tzeng-Hwang is presented with two main results: The modified scheme requires fewer keys than the scheme by Laih and Kuo, and it is able to withstand many attacks including the one mentioned by Qian, Chao and Bao.     

高维矩阵在密码学中的应用

本文利用高维矩阵给出一类新型的公钥分配方案,并将它推广到会议情形;接着在此公钥分配方案的基础上给出了另一类自确认密码体系.     

Z[ω]环上的两类密码体制

本文在Eisenstein环Z[ω]上得到了两类新的密码体制。它们分别是推广的RSA密码体制和自确认密码体制。安全性分别基于环Z[ω]上整数的分解和Z[ω]环上离散对数的计算。     

量子保密与免疫机制在Ad Hoc网络的应用

针对AdHoc网络中存在的安全问题,利用量子通信绝对安全的特性和细胞自我免疫系统的性质,将二者有机地结合在一起,有效地提高了AdHoc的安全性能。分析结果表明,结合量子密钥分发以及细胞自我免疫技术之后,AdHoc网络仍然具有明显而且优越的自组织性和适应性,更重要的是,安全性能可以得到很大改善。对于未来军事通信中网络安全的发展起到关键作用。     

基于状态机的虚拟仪器自动检测系统设计

文章阐述的自动检测系统是基于状态机开发的虚拟仪器系统,可自动完成待测模块的数据采集、实时显示、数据处理和数据存储的全部过程,为自动测试系统提供了一个很好的平台.该系统的开发原理及思想适用于各类型自动测试系统,并且具有模块化设计、数据采集精度高、人机界面友好、稳定性好等特点.采用IVI技术和信号产生子VI进行仿真,得到了很好的信号检测结果,同时介绍了状态机技术在密码学中的应用.     

The Beale ciphers in fiction

The Beale ciphers are an interesting unsolved cryptographic puzzle, if for no other reason than their solution may uncover the location of a multimillion-dollar treasure. That is, if they are not a hoax. Over the years many cryptanalysts, amateur and professional, have tried and failed to decrypt the final two Beale ciphers. Recently, a number of writers have used the ciphers in their works of fiction. I review ten such novels and a short animated movie that all use the Beale ciphers as plot elements. The novels fall into two categories. First are novels where the objective is to solve the Beale ciphers and find the treasure. These novels use probable and improbable techniques to find the solutions. In some the solution occurs out of sight so the reader has no insight into the cryptanalysis. Second are novels where the existence of the Beale ciphers and their construction as book ciphers further a different story narrative. In these novels the Beale ciphers are mentioned and described but no attempt is made to solve them. There is usually another book cipher that must be solved instead. In conclusion, the Beale ciphers still seem to be generating significant interest.     

进位返加与异或运算异或差值的概率分布

详细分析了进位返加运算的进位序列, 通过对Fn2空间的划分,解决了计算进位返加运算进位序列的概率分布问题. 提出了一种计算进位返加与F2上异或运算“异或差值”概率分布的有效算法, 该算法的计算复杂度为O((n－1)/2). 解决了用模2加运算整体逼近进位返加运算时产生误差的概率分布,同时也反映了这2个运算的接近程度.