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Related Concept Videos

Sound Waves: Interference00:53

Sound Waves: Interference

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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...
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Phase Contrast and Differential Interference Contrast Microscopy01:26

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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...
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Interference and Superposition of Waves01:07

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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,...
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BIBO stability of continuous and discrete -time systems01:24

BIBO stability of continuous and discrete -time systems

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System stability is a fundamental concept in signal processing, often assessed using convolution. For a system to be considered bounded-input bounded-output (BIBO) stable, any bounded input signal must produce a bounded output signal. A bounded input signal is one where the modulus does not exceed a certain constant at any point in time.
To determine the BIBO stability, the convolution integral is utilized when a bounded continuous-time input is applied to a Linear Time-Invariant (LTI) system....
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Interference and Decay01:16

Interference and Decay

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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...
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Interference: Path Lengths01:10

Interference: Path Lengths

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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...
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Updated: Oct 17, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Cryptoanalysis and enhancement of a binary image encryption system based on interference.

Jiahui Du, Yi Xiong, Chenggen Quan

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    Summary
    This summary is machine-generated.

    This study analyzes a binary image encryption system, revealing vulnerabilities to known-plaintext and ciphertext-only attacks. An improved system is proposed, enhancing security for both binary and grayscale images against these attacks.

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    Area of Science:

    • Computer Science
    • Cryptography
    • Image Processing

    Background:

    • A binary image encryption system using random phase masks (RPM) and phase-only masks (POMs) is analyzed.
    • The system separates a modulated plaintext into two POMs for encryption, with phase wrapping for silhouette removal.

    Purpose of the Study:

    • To perform cryptoanalysis on the existing binary image encryption system.
    • To propose an improved cryptosystem resistant to identified attacks and capable of handling grayscale images.

    Main Methods:

    • A hybrid attack combining known-plaintext attack (KPA) and ciphertext-only attack (COA) was developed.
    • Numerical simulations were used to validate the improved cryptosystem's feasibility and effectiveness.

    Main Results:

    • The original system is vulnerable to KPA for RPM retrieval, enabling subsequent COA.
    • A novel hybrid attack compromising the system was demonstrated.
    • An enhanced cryptosystem was developed, supporting binary and grayscale images.

    Conclusions:

    • The original system's limitations and security flaws were identified.
    • The enhanced system demonstrates immunity to the proposed hybrid attack.
    • The improved cryptosystem offers enhanced security and broader applicability for image encryption.