提高RSA安全性的几种方法

RSA是目前数字签名领域中应用最为广泛的算法,本文详细论述了RSA算法的数学原理和实现过程,针对其安全性方面的漏洞和缺陷进行分析,提出了提高RSA算法安全性的参数选择方案与避免攻击的解决办法,最后对RSA的发展趋势做出展望.     

叠氮复合固体推进剂技术研究

分析了航天器和导弹武器系统对固体推进剂提出的新的要求和实现这些要求的技术途径。介绍了国外研制低特征信号叠氮固体推进剂的主要原材料叠氮粘合剂、含能增塑剂、高能高密度氧化剂的发展概况和关键技术。分析认为，由以上材料组成的叠氮复合固体推进剂具有含能量高、密度大、发动机排气羽烟对微波、激光和可见光的透过率高等特征，因此这是一种很有前途的新型推进剂。     

海上舰船目标的宽带雷达散射特征信号仿真

提出一种将目标高频电磁（EM）散射计算多径回波模型与不同海况条件下粗糙海面前向复反射系数模型相结合的方法,对海上舰船目标宽带雷达回波进行仿真和分析。简要分析了目标-海面相互作用的多径回波模型,给出了目标体的电磁散射计算方法,研究了不同海况条件下海面前向复反射系数随频率和擦地角的变化特性,并通过仿真分析了海面对舰船目标雷达回波的影响。对比分析舰船目标体直接散射及在不同海况条件下考虑多径效应时的雷达散射截面（RCS）变化特性,并在不同海况条件下对目标进行二维逆合成孔径雷达（ISAR）成像仿真,验证了本文方法的有效性。     

Fractal signatures for multiscale processing of hyperspectral image data

A multiscale approach to hyperspectral image data analysis using fractal signatures was proposed and implemented in the Interactive Data Language (IDL). For 2-D hyperspectral curves, fractal signature measures the changes in curve length with changing scale. Using NASA’s Earth Observing-1 (EO-1) Hyperion image from a study area near Denton, Texas, USA, the capabilities of fractal signatures in discriminating different land cover types were presented in three different ways: (1) fractal signature curves, (2) distances between fractal signatures, and (3) fractal signature images. The asymmetry in length measurement was found to be effective in handling hyperspectral curves obtained from Hyperion radiance data. The contribution of fractal signature images was shown through comparison of image classification results. The results from the Hyperion radiance data suggest that fractal signatures at certain scales can reveal important differences in land cover types.     

Infrared radiation signature of exhaust plume from solid propellants with different energy characteristics

The infrared radiation signature of the plume from solid propellants with different energy characteristics is not the same. Three kinds of double-base propellants of different energy characteristics are chosen to measure the infrared spectral radiance from 1000 cm 1 to 4500 cm 1 of their plumes. The radiative spectrum is obtained in the tests. The experimental results indicate that the infrared radiation of the plume is determined by the energy characteristics of the propellant. The radiative transfer calculation models of the exhaust plume for the solid propellants are established. By including the chemical reaction source term and the radiation source term into the energy equation, the plume field and the radiative transfer are solved in a coupled way. The calculated results are consistent with the experimental data, so the reliability of the models is confirmed. The temperature distribution and the extent of the afterburning of the plume are distinct for the propellants of different energy characteristics, therefore the plume radiation varies for different propellants. The temperature of the fluid cell in the plume will increase or decrease to some extent by the influence of the radiation term.     

Java卡的可信代码装载机制设计

对满足可信计算平台(TCP,Trusted Computing Platform)需求的代码管理问题,提出了以Java卡为核心,以代码签名技术为主要手段,以卡内的安全域(security domain)作为各个软件权威(Java卡设备发行方和应用提供方)安全策略执行者的可信代码管理框架.新机制支持设备发行方软件的装载和更新,完善了应用提供方安全域的装载和更新流程,并对下载命令数据结构进行了扩充.解决了在复杂应用环境中,多个软件权威相互独立的限制条件下,代码的免人工广播式发布问题,扩展了传统Java卡软件装载模式,提高了系统的安全性,为使用Java卡平台进行可信计算提供保障.     

固体火箭发动机羽烟特征信号的分类及测试评估概述

介绍了国外低特征信号固体推进剂分类标准和固体火箭发动机羽烟特征信号分类及测试技术等方面的工作,主要内容涉及发动机羽烟特征信号的定义、产生根源、对使用的影响、理论预估及特征信号测试评估的各种实验方法和设施,并预示了羽烟特征信号测试与评估的发展方向。     

ECDSA算法在智能卡上的实现

首先探讨在智能卡上实现椭圆曲线数字签名算法 (ECDSA)中有限域元素运算和椭圆曲线上点运算的快速实现方法 ,其次探讨引入随机序列校验提高系统安全性的方法和系统参数在卡上的存储方案。最后 ,在卡上实现了签名算法。测试结果表明 ,系统运行高效、正确。     

智能卡在PKI系统中的应用

介绍PK I系统和智能卡系统的基本原理和框架。总结智能卡在PK I系统中的应用方式和方法。分析引入智能卡对于增强PK I系统安全性能的作用。     

GAP高能低特征信号推进剂的研究

综述了四十二所GAP粘合剂和GAP高能低特征信号推进剂的研究及取得的进展、目前达到的技术水平。叠氮类推进剂可发展成高能、低特征信号和纯感推进剂，是今后战术发动机用固体推进剂的发展重点和方向。