Analysis of Electromagnetic Information Leakage Based on Cryptographic Integrated Circuits

Cryptographic algorithm is the most commonly used method of information security protection for many devices. The secret key of cryptographic algorithm is usually stored in these devices’ registers. In this paper, we propose an electromagnetic information leakage model to investigate the relationship between the electromagnetic leakage signal and the secret key. The registers are considered as electric dipole models to illustrate the source of the electromagnetic leakage. The equivalent circuit of the magnetic field probe is developed to bridge the output voltage and the electromagnetic leakage signal. Combining them, the electromagnetic information leakage model’s function relationship can be established. Besides, an electromagnetic leakage model based on multiple linear regression is proposed to recover the secret key and the model’s effectiveness is evaluated by guess entropy. Near field tests are conducted in an unshielded ordinary indoor environment to investigate the electromagnetic side-channel information leakage. The experiment result shows the correctness of the proposed electromagnetic leakage model and it can be used to recover the secret key of the cryptographic algorithm.     

Analysis and finite element simulation of electromagnetic heating in the nitride MOCVD reactor

Electromagnetic field distribution in the vertical metal organic chemical vapour deposition (MOCVD) reactor is simulated by using the finite element method (FEM). The effects of alternating current frequency, intensity, coil turn number and the distance between the coil turns on the distribution of the Joule heat are analysed separately, and their relations to the value of Joule heat are also investigated. The temperature distribution on the susceptor is also obtained. It is observed that the results of the simulation are in good agreement with previous measurements.     

Lifetime measurements in chiral nucleus 130Cs

The level lifetimes in partner bands of 130Cs have been measured using the Doppler Shift Attenuation method. The high-spin states of 130Cs were populated via fusion evaporation reaction 124Sn(11B,5n)130Cs at a beam energy of 65 MeV. The absolute M1 and E2 transition probabilities have been deduced. The results indicate that the partner bands of 130Cs manifest the chiral properties.     

Single π0electro-production in the resonance region with CLAS＊

We report the analysis status of single π0electroproduction in the resonance region to study the electromagnetic excitation of the nucleon resonances. The study is aimed at understanding of the internal structure and dynamics of the nucleon. The experiment was performed using an unpolarized cryogenic hydrogen target and 2.0 and 5.8 GeV polarized electron beam during the ele and e1-6 run periods with CLAS at Jefferson Lab. The new measurements will produce a data base with high statistics and large kinematic coverage for the hadronic invariant mass （W） up to 2.0 CeV in the momentum transfer （Q2） range of 0.3--6.0 GeV2. Preliminary results will be presented and compared with the various model calculations.     

耦合腔高频特性的单腔模型研究与应用

在耦合腔结构的高频特性模拟中,基于准周期边界条件法建立的双腔模型,由于两端电场的边界条件完全相同,导致了伪解的出现。本文建立了单腔仿真模型,消除了伪解存在的边界条件,避免伪解的出现。在保证求解精度的基础上,网格数目减少了 62%,总计算时间缩小了 56%,一次性生成色散曲线和耦合阻抗曲线,提高了色散和耦合阻抗的数据处理效率,为高频结构参数优化提供了更有效的途径。采用单腔仿真模型,模拟分析了各结构尺寸对高频特性的影响。     

我们生活在一碗汤面里吗?——光和电子的统一与起源

光和物质的起源是物理学中一个非常基本的问题,对该问题的探究贯穿了整个物理学的发展史.文章首先从最早的光微粒说和波动理论讲起,详细介绍了为什么光的波动学说可以成功地解释光的折射和干涉现象.然后以光的横波特性为基础,论述了是否存在可以承载光传播的媒介物质.通过对电荷和磁场的研究,人们认识到光是一种电磁波.最后从凝聚态物理学的演生原理出发,作者论述了弦网液体中的弦密度波对应于电磁波,弦的端点对应于电子,进而给出了光和电子起源的统一解释.     

电磁波极化的应用

极化是电磁波的一个重要参量,是电动力学、电磁场与电磁波课程教学中的重点内容之一.系统介绍电磁波极化这一概念在通信、雷达和抗干扰等方面的应用,即利用电磁波极化实现无线电信号的最佳发射和接收,利用极化提高通信容量,探讨了电磁波极化在雷达目标识别、检测、成像以及抗干扰中的应用.     

新型半导体开关高压电磁脉冲产生技术

基于独特结构和物理特性的两类高性能新型高压半导体开关漂移阶跃恢复二极管和快速离化开关,提出一种新型高功率高压纳秒电磁脉冲产生方法,其技术路径是通过高压漂移阶跃恢复二极管开关将高贮能电感能量向高压快速离化开关及负载转移,产生高功率、高重复频率纳秒电磁脉冲,并用实验验证该方法在高重复频率（120,200,300 kHz）下产生高功率、高重复频率纳秒脉冲的有效性,输出脉冲电压分别为1.62,1.41,1.36 kV。     

电场极化方向对自由空间电场测量的影响

介绍了自主研制的脉冲电场原始波形测量系统的模块组成与基本工作原理。针对在未知被测电场方向及复杂的电场环境下垂直干扰电场对自由空间电场测量产生的影响,通过建立自由空间电场测量系统前端的简化模型,对不同尺寸天线与屏蔽盒进行仿真计算。仿真计算结果与理论分析基本一致,结果表明：干扰电场响应信号与待测电场响应信号相差2个数量级以上,干扰电场的影响可忽略不计。     

降低表面等离子激元寄生吸收损失的途径研究

从纳米Ag颗粒表面等离子激元光学及表面高能电场特性两方面入手,较为系统地研究了周围介质的导电特性对表面等离子激元的影响.通过对复合薄膜紫外-可见-近红外光谱及表面增强拉曼散射光谱的分析,指出绝缘性的Al₂O₃介质薄膜能够起到良好的表面电场定域效果,且不会引入附加的光吸收损失;而导电性的ITO薄膜则会引入表面价电子的溢出损失,加速了表面电场的衰逝,同时引起长波方向上显著的光吸收损失.研究还表明致密的Al₂O₃介质薄膜能够起到良好的屏蔽作用,且纳米Ag颗粒表面等离子激元特性仅受最近邻材料特性的影响.研究结果为在硅基薄膜太阳电池中实现对纳米Ag颗粒的阻挡、寄生光吸收损失的降低以及表面高能电场的利用,提供了一条有效的解决途径.