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相关概念视频

Propagation Speed of Electromagnetic Waves01:30

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Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws...
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Electromagnetic (EM) radiation consists of electric and magnetic field components oscillating in planes perpendicular to each other and mutually perpendicular to radiation propagation through space. EM radiation can be classified as a wave, characterized by the properties of waves such as wavelength (denoted as λ) and frequency (represented by ν).
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Electromagnetic waves can travel in the vacuum as well as in matter. For example light, which is an electromagnetic wave, can travel through air, water, or glass.
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Anyone who has used a microwave oven knows there is energy in electromagnetic waves. Sometimes, this energy is obvious, such as in the summer sun's warmth. At other times, it is subtle, such as the unfelt energy of gamma rays, which can destroy living cells. Electromagnetic waves bring energy into a system through their electric and magnetic fields. These fields can exert forces and move charges in the system and, thus, do work on them. However, there is energy in an electromagnetic wave,...
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Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
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由时空编码元地表启用的加密无线通信的协议无神论元密钥分发.

Xinyu Li1, Long Chen1, Guanxiong Shen2

  • 1State Key Laboratory of Millimeter Waves and Institute of Electromagnetic Space, Southeast University, Nanjing, 210096, China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
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概括

一个新的Meta Key Distribution (MKD) 系统使用可编程的Metasurface安全地通过无线通道共享加密密钥. 这种方法提供了一种轻量级,兼容的解决方案,用于物联网和智能家居应用中的安全通信.

关键词:
这是加密的无线通信.物理层的安全层是物理层.可编程的地表变量.安全的密钥分配安全的密钥分配空间时间编码.

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科学领域:

  • 无线通信安全 无线通信安全
  • 超材料和电磁工程
  • 密码学和信息理论.

背景情况:

  • 安全密钥分配对于加密通信至关重要,但在室内无线环境中面临挑战.
  • 现有的方法往往需要高计算能力和专门的硬件,限制了它们的适用性.
  • 对轻量级,兼容和安全的密钥分发解决方案的需求正在增长,特别是在物联网和智能环境中.

研究的目的:

  • 提出和验证一个使用可编程元表进行安全密钥生成的元密钥分配 (MKD) 系统.
  • 通过在无线通道中嵌入同步来实现协议独立的加密通信.
  • 为在资源有限的室内环境中提供安全密钥分配的实用和有效解决方案.

主要方法:

  • 开发一个使用可编程元表面的元密钥分配 (MKD) 系统.
  • 超表面对电磁波特性进行动态调制,以嵌入同步.
  • 在室内环境中实验实施和验证MKD系统.
  • 与WiFi和蓝牙等标准无线协议进行集成测试.

主要成果:

  • 在室内环境中成功验证MKD系统的实验.
  • 实现了400比特/秒的密钥生成率,比特错误率低于3%.
  • 证明了可靠的密钥生成性能和对被动窃听的强烈抵抗力.
  • 已确认与现有无线协议的兼容性,无需对硬件进行重大修改.

结论:

  • 拟议的超表面辅助MKD系统为钥匙分配提供了一个轻量级,兼容和安全的解决方案.
  • 这种方法克服了传统方法的局限性,为各种应用提供了切实可行的替代方案.
  • MKD系统非常适合用于智能家居,物联网 (IoT) 和医疗环境中的新兴应用.