An implementation for a fast public-key cryptosystem

In this paper we examine the development of a high-speed implementation of a system to perform exponentiation in fields of the form GF(2 ⁿ ). For sufficiently large n, this device has applications in public-key cryptography. The selection of representation and observations on the structure of multiplication have led to the development of an architecture which is of low complexity and high speed. A VLSI implementation has being fabricated with measured throughput for exponentiation for cryptographic purposes of approximately 300 kilobits per second.     

SAGCM-APD增益影响因子分析与优化

应用二维漂移扩散模型研究具有分立吸收层、渐变层、电荷层和倍增层结构(SAGCM)的InGaAsP-InP雪崩光电探测器(APD),仿真分析了不同电荷层、倍增层厚度和掺杂浓度对电场分布、电流响应及击穿电压的影响,特别是参数变量对增益计算模型的影响,载流子传输过程的时间依赖关系和倍增层中所处位置的影响,仿真结果表明:较高掺杂浓度和较薄电荷层结构可以改变器件内部的电场分布,进而提高增益值.当入射光波长为1.55μm,光功率为500 W/m2时,光电流响应量级在10-2A;阈值电压降低到10V以下,击穿电压为42.6V时,器件倍增增益值大于100.     

Fast Multiplication on Elliptic Curves over Small Fields of Characteristic Two

We discuss new algorithms for multiplying points on elliptic curves defined over small finite fields of characteristic two. This algorithm is an extension of previous results by Koblitz, Meier, and Staffelbach. Experimental results show that the new methods can give a running time improvement of up to 50 % compared with the ordinary binary algorithm for multiplication. Finally, we present a table of elliptic curves, which are well suited for elliptic curve public key cryptosystems, and for which the new algorithm can be used. Received 14 January 1997 and revised 4 September 1997     

对线性调频信号雷达的噪声干扰方法研究

为了提高雷达抗干扰能力,线性调频信号雷达通常利用脉冲压缩技术,具有较强的抗常规压制噪声干扰的能力,为了有效干扰上述雷达,提出了两种噪声干扰技术,即干扰机将侦收的雷达发射信号与窄带噪声在时域进行相乘处理或卷积处理,再经干扰机功率放大后辐射的两种干扰方法.上述两种干扰方法均不需要测频和频率引导就能自动瞄准雷达信号频率,并可利用雷达脉冲压缩处理时的处理增益,降低了对干扰机发射功率的要求,较传统宽带压制噪声干扰的方法有明显优势.通过理论推导,仿真分析和试验验证,表明上述两种干扰方法对线性调频信号雷达均有显著的干扰效果.     

一种基于加法链的快速标量乘算法

给出一种标量的串长加法链算法来提高椭圆曲线标量乘法的效率。新的标量乘算法结合底层域直接计算2Q+P、2^nR+S算法,使用大小窗口法将串长算法和滑动窗口算法结合,加法链长度、存储空间和预计算都减少,其效率比二元法提高53%,比NAF法提高47.5%,比串长算法提高46.2%,比Windows法提高42.2%。     

矩阵乘并行算法的仿真与性能分析

为了优化矩阵乘法的并行运算效率,提高流水线的性能,采用了基于Strassen算法的矩阵来运算,并通过缟码在DLX模拟的并行流水线环境中仿真运行.实验结果表明,优化后的矩阵秉算法降低了时间复杂度,减少了指令条数和运算周期,显著地提高了流水线上矩阵秉法的并行运算效率.     

Shallow circuits and concise formulae for multiple addition and multiplication

A theory is developed for the construction of carry-save networks with minimal delay, using a given collection of carry-save adders each of which may receive inputs and produce outputs using several different representation standards.The construction of some new carry-save adders is described. Using these carry-save adders optimally, as prescribed by the above theory, we get {, , }-circuits of depth 3.48 log₂ n and {, , }-circuits of depth 4.95 log₂ n for the carry-save addition ofn numbers of arbitrary length. As a consequence we get multiplication circuits of the same depth. These circuits put out two numbers whose sum is the result of the multiplication. If a single output number is required then the depth of the multiplication circuits increases respectively to 4.48 log₂ n and 5.95 log₂ n.We also get {, , }-formulae of sizeO (n ^3.13) and {, }-formulae of sizeO (n ^4.57) for all the output bits of a carry-save addition ofn numbers. As a consequence we get formulae of the same size for the majority function and many other symmetric Boolean functions.     

有限素整数域椭圆曲线密码体制基于代数几何快速算法设计

椭圆曲线公钥密码体制(ECC)具有最高的位安全强度,将是对现有公钥密码体制的替代。文章描述了代数几何与ECC的数学基础,讨论了椭圆曲线离散对数困难性问题及ECC在电子商务中的安全应用。利用仿射坐标与射影坐标的映射关系,设计了一种有限素整数域上ECC快速算法,使得ECC在电子商务中实际安全应用成为可能。     

综合交通枢纽地下空间开发利用探究

该文通过探讨综合交通枢纽地下空间的开发利用优势及重要性,并对国内外综合交通枢纽典型实例进行解析,提出综合交通枢纽设计应重视功能的多元复合化、空间的立体集约化,使之形成地上地下共同高效运转的节点型综合体。同时注重交通枢纽与城市公共空间的融合,体现城市、建筑一体化发展。     

雪崩光电管偏压控制电路的研制

本文分析了雪崩光电管内倍增因子与偏压的关系，介绍了偏压的虚警控制原理，所述电路适用于温度和背景光强大幅度变化的连续探测的光电系统。