嵌入式防抄版加密芯片 DM2016及其应用

随着嵌入式系统的广泛应用,嵌入式应用系统的开发者必然面临系统开发成果被仿制或剽窃的局面.介绍了嵌入式系统加密芯片DM2016的结构、特点,同时给出了该芯片在嵌入式应用系统中的加密方法及应用.     

基因表达式演化建模

为了有效地建立动态系统的演化模型,将常微分方程的解的模型按基因表达式编码,给出了动态系统建模在遗传算法求解中的编码规则.算法采用精英选择,在主要遗传算子中,结合四阶龙格—库塔迭代公式对个体进行评估,按基因表达式程序设计进行演化,算法在求解过程中不需要过多地依赖于问题本身的知识,从而极大地降低了问题的复杂性.数值实验表明,算法具有很强的普适性.     

基于RSA的广播加密方案

为提高广播加密系统的实用性和效率,通过采用不同模余下的授权用户成员的群密钥分发策略,构造了一个新的基于RSA加密方案的广播加密方案,可以进行安全的群密钥分发,并能够有效地实现无需密钥更新的新成员的动态加入.该方案减少了通信传输带宽以及用户的密钥存储量(仅需一个群元素),并且其加解密的计算代价与RSA加密方案相当.分析了该方案的效率,并在RSA假设下证明了该方案在任意用户的合谋攻击下的安全性.     

Signal and reference wave dually encrypted digital holographic system

We propose a secure digital holographic system with signal and reference waves dually encrypted. Two random phase masks are used to encrypt the images in the input and the Fourier planes. The reference beam is phase encoded by another random phase mask. The encrypted image and the key are recorded by a CCD camera. The data can be processed or transferred directly by computer. We theoretically and experimentally demonstrate encryption and decryption of multiple images and the results show a high quality and good fault tolerance.     

一种新型的文本信息加密与识别系统——陈-Mobius变换的一种新应用

利用LabVIEW平台,通过软件编程,把文本信息通过变换形成数据流;用几种波形进行编码,加载到陈-Mobius逆变换函数上,使文本信息变成密文;接收方通过解密函数进行解密,恢复本来的文本信息,实现了整个加密系统.利用PC机的网络接口进行传输与接收,构成一套文本信息加密及保密传输系统.     

无线网络安全技术分析

随着网络的日益发展,无线技术凭借其方便快捷的优点,在各个行业得到广泛应用。在无线设备信号的稳定性和覆盖范围得到增强后,随之而来的安全性问题也日渐突出。本文分析了无线网络的原理,将一些保障无线网络技术安全的方式方法介绍给大家。     

Analysis of the design methods of word oriented linear feedback shift registers

Based on analysis of the structure characteristics and implementation methods of some representative word oriented linear feedback shift registers （LFSRs） in several modem software oriented stream ciphers, this paper firstly classifies the word oriented LFSRs into two classes： the machine instruction type and the arithmetic type. The similarities and differences between each type are illustrated by concrete examples. Then we give a detailed analysis about the word oriented LFSRs in each category from design structure, cryptographic properties and implementation issue aspects. Finally, some basic design criteria for modem word oriented LFSRs and suitable for software implementation are summarized.     

Instantiate random oracles in OAEP with pseudorandom functions

This paper focuses on the instantiation of random oracles in public key encryption schemes. A misunderstanding in the former instantiations is pointed out and analyzed. A method of using this primitive as a substitution of random oracles is also proposed. The partial and full instantiations of random oracles in optimal asymmetric encryption padding （OAEP） implemented by pseudorandom functions are described and the resulted schemes are proven to be indistinguishable secure against adaptive chosen ciphertext attack （IND-CCA2） secure. Using this method, one can transform a practical public key encryption scheme secure in the random oracle model into a standard-model secure scheme. The security of the scheme is based on computational assumptions, which is weaker than decisional assumptions used in Cramer- Shoup like schemes.     

利用有限域上辛几何构作Cartesian认证码

利用有限域上的辛几何构作了一个Cartesian认证码,并计算了这个码的参数。进而,假定编码规则按照均匀的概率分布所选取,计算出了该码被模仿攻击成功的最大概率P1和被替换攻击成功的最大概率P3。     

论大学英语课堂教学中的语码转换

作为一种教学策略,大学英语课堂教学有必要进行英汉语码的转换;作为一种教学方式,大学英语课堂还有必要进行简单语码与复杂语码的转换。作为大学英语教师,应该把握好转换的度,使学生在循序渐进的过程中学好英语;否则过犹不及,势必影响学生语言能力的培养和语言水平的提高。