相关实验视频
Updated: May 30, 2025

06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
8.9K
概括
本研究介绍了一种使用压力传感 (CS) 来安全传输多媒体图像的秘密混乱加密 (CCE) 方案. 这种新的方法实现了超高的安全性,并将光学无线系统的数据量减少了75% .
科学领域:
- 网络安全 网络安全
- 光学通信是指光学通信.
- 信号处理 信号处理
背景情况:
- 多媒体数据安全性至关重要.
- 现有的加密方法在高容量传输中面临着挑战.
- 压缩传感 (CS) 为高效的数据处理提供了潜力.
研究的目的:
- 提出一个新的秘密混乱加密 (CCE) 方案.
- 将CCE与压力传感 (CS) 集成,以提高安全性和效率.
- 评估该方案在W频段无线电光纤 (RoF) 系统中的性能.
主要方法:
- 使用六维超混沌的D-系统进行序列生成.
- 使用混乱序列用于混乱指数稀疏区块 (CISB),CS测量矩阵生成,变量参数代的阿诺德转换和双随机LSB编码/嵌入.
- 在4Gb/s的W带OFDM-RoF系统中实施CCE-CS方案.
主要成果:
- 实现了图像数据的多域,多维,超高安全性加密.
- 在输入光功率 (IOP) > 1dBm的情况下,证明了比特错误率 (BER) 低于3.8×10−3的FEC值.
- 在6 dBm IOP下获得0.96的平均结构相似度指数 (MSSIM),这表明重建质量很好.
- 关键空间达到了10160,确保了对攻击的强大抵抗力.
- 与非CS系统相比,传输数据量减少了75%.
结论:
- 拟议的CCE-CS方案为多媒体图像加密提供了超高的安全性和效率.
- 与W频段RoF系统的集成显示了高容量,安全的光学无线通信的巨大潜力.
- 该方案有效平衡了安全性,数据减少和传输质量.
相关概念视频
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences
733
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
733
Generating Electromagnetic Radiations
2.6K
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...
2.6K
Linear time-invariant Systems
209
A system is linear if it displays the characteristics of homogeneity and additivity, together termed the superposition property. This principle is fundamental in all linear systems. Linear time-invariant (LTI) systems include systems with linear elements and constant parameters.
The input-output behavior of an LTI system can be fully defined by its response to an impulsive excitation at its input. Once this impulse response is known, the system's reaction to any other input can be...
The input-output behavior of an LTI system can be fully defined by its response to an impulsive excitation at its input. Once this impulse response is known, the system's reaction to any other input can be...
209
Electromagnetic Waves
8.5K
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...
8.5K

