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関連する概念動画

Entropy Change in Reversible Processes01:10

Entropy Change in Reversible Processes

2.7K
In the Carnot engine, which achieves the maximum efficiency between two reservoirs of fixed temperatures, the total change in entropy is zero. The observation can be generalized by considering any reversible cyclic process consisting of many Carnot cycles. Thus, it can be stated that the total entropy change of any ideal reversible cycle is zero.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
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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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Linear time-invariant Systems01:23

Linear time-invariant Systems

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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...
407
Convolution Properties I01:20

Convolution Properties I

236
Convolution computations can be simplified by utilizing their inherent properties.
The commutative property reveals that the input and the impulse response of an LTI (Linear Time-Invariant) system can be interchanged without affecting the output:
236
Classification of Systems-I01:26

Classification of Systems-I

296
Linearity is a system property characterized by a direct input-output relationship, combining homogeneity and additivity.
Homogeneity dictates that if an input x(t) is multiplied by a constant c, the output y(t) is multiplied by the same constant. Mathematically, this is expressed as:
296
Convolution: Math, Graphics, and Discrete Signals01:24

Convolution: Math, Graphics, and Discrete Signals

399
In any LTI (Linear Time-Invariant) system, the convolution of two signals is denoted using a convolution operator, assuming all initial conditions are zero. The convolution integral can be divided into two parts: the zero-input or natural response and the zero-state or forced response, with t0 indicating the initial time.
To simplify the convolution integral, it is assumed that both the input signal and impulse response are zero for negative time values. The graphical convolution process...
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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混沌としたシステムと非線形変換に基づく安全で効率的な画像暗号化スキーム

Wassim Alexan1, Noura H El Shabasy2, Noha Ehab3

  • 1Communications Department, Faculty of Information Engineering and Technology, German University in Cairo (GUC), New Cairo, Egypt. wassim.alexan@ieee.org.

Scientific reports
|August 25, 2025
PubMed
まとめ
この要約は機械生成です。

この研究は5Dハイパーカオティックシステム,アーノルドのキャットマップ,ラングトンのアントを使用した新しいマルチ画像暗号化方法を紹介しています. この技術はデジタル画像の暗号化に より高い安全性と効率性をもたらし,従来の方法よりも優れています.

キーワード:
アーノルドの猫の地図混沌とした地図暗号化ハイパーカオティックなシステム画像の暗号化ラングトンセキュリティ分析

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Detection of Architectural Distortion in Prior Mammograms via Analysis of Oriented Patterns
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関連する実験動画

Last Updated: Sep 10, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Detection of Architectural Distortion in Prior Mammograms via Analysis of Oriented Patterns
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科学分野:

  • コンピュータ科学
  • 暗号化
  • 情報セキュリティ

背景:

  • デジタル画像の暗号化は,データとIoTの採用が増加しているため,非常に重要です.
  • AESやDESのような伝統的な方法は,冗長性やリアルタイムのニーズのために画像データには不十分です.

研究 の 目的:

  • 新しい安全で効率的なマルチ画像暗号化スキームを提案します
  • デジタル画像の伝統的な暗号化の限界を解決するために

主な方法:

  • キー生成のための5Dハイパーカオティックシステムの統合
  • 変換のためのアーノルドのキャットマップとピクセルスクランブル (拡散) のためのラングトンのアントを使用します.
  • バイトの置換のための新設計のSボックスです.

主要な成果:

  • 大きなキースペースと低いピクセル相関を達成しました.
  • 証明された高速暗号化速度 (512x512の画像で0.1602秒).
  • 安全性分析 (ヒストグラム,相関性,エントロピー,NPCR,UACI,NIST試験) により強度が確認されました.

結論:

  • 提案されたハイブリッド暗号化方法は,高いセキュリティと効率を提供します.
  • リアルタイムのアプリケーションに適しており,様々な攻撃に抵抗します.
  • 既存の混沌とハイブリッドの 暗号化技術を上回る