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相关概念视频

Interference: Path Lengths01:10

Interference: Path Lengths

1.3K
Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
1.3K
Interference and Decay01:16

Interference and Decay

165
Forgetting is a complex cognitive phenomenon influenced by several factors, among which interference and decay are particularly prominent. These processes explain why individuals often struggle to retrieve specific information from memory, leading to lapses in recall that can be observed in everyday situations.
Interference occurs when competing memories hinder the retrieval of particular information. It can be classified into two types: proactive and retroactive interference. Proactive...
165
Sound Waves: Interference00:53

Sound Waves: Interference

3.8K
Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
3.8K
Interference and Superposition of Waves01:07

Interference and Superposition of Waves

5.3K
When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
5.3K
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

8.2K
Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
8.2K
Conservative Site-specific Recombination and Phase Variation02:53

Conservative Site-specific Recombination and Phase Variation

6.0K
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
6.0K

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相关实验视频

Updated: Jul 16, 2025

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
06:25

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Published on: February 12, 2014

8.5K

基于干扰和阶段检索技术的加密系统的混合纯文本攻击.

Y Xiong, J Gu, R Kumar

    Applied optics
    |September 14, 2023
    PubMed
    概括

    这项研究揭示了使用相位检索的光学加密系统中的安全漏洞. 已知纯文本攻击可以恢复私钥,从而危及系统的安全性.

    科学领域:

    • 光学安全系统光学安全系统.
    • 密码学 密码学 密码学 密码学
    • 信息安全信息安全.

    背景情况:

    • 传统的基于干扰的光学加密系统往往会遇到轮问题.
    • 阶段检索技术通过生成仅阶段面罩 (POM) 作为加密文本来增强光学加密系统.
    • 拟议的系统利用相位检索来提高安全性,并可能减轻轮问题.

    研究的目的:

    • 评估增强光学加密系统的安全强度.
    • 识别和利用系统安全机制中的漏洞.
    • 提出针对增强型加密系统的新型攻击策略.

    主要方法:

    • 开发了一种混合已知纯文本攻击 (KPA).
    • 三个已知的纯文本-密码文本对被用作振幅和相位约束.
    • 攻击的目的是准确估计固定的随机相口罩 (RPM),系统的私钥.

    主要成果:

    • 该研究表明,尽管RPM是固定的,但可以通过KPA恢复.
    • 拟议的混合KPA成功地使用有限的已知纯文本和加密文本对来估计RPM.
    • 加密分析证实了安全漏洞,使加密系统变得脆弱.

    更多相关视频

    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
    00:07

    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

    Published on: September 5, 2019

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    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
    08:39

    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

    Published on: January 28, 2019

    9.9K

    相关实验视频

    Last Updated: Jul 16, 2025

    Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
    06:25

    Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

    Published on: February 12, 2014

    8.5K
    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
    00:07

    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

    Published on: September 5, 2019

    8.5K
    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
    08:39

    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

    Published on: January 28, 2019

    9.9K

    结论:

    • 增强的光学加密系统,尽管使用相位检索,但易受拟议的已知纯文本攻击.
    • 随机相罩的固定性质是一个关键的安全漏洞.
    • 数字模拟验证了攻击在检索纯文本信息方面的有效性.