Related Experiment Video
Updated: Oct 6, 2025

Automated Analysis of Dynamic Ca2+ Signals in Image Sequences
Published on: June 16, 2014
Cryptanalysis of an Image Encryption Algorithm Based on Random Walk and Hyperchaotic Systems
Haiju Fan1,2,3,4, Heng Lu1,2,3,4, Chenjiu Zhang1,2,3,4
1College of Computer and Information Engineering, Henan Normal University, Xinxiang 453007, China.
Abstract:
Recently, an image encryption algorithm based on random walk and hyperchaotic systems has been proposed. The main idea of the original paper is to scramble the plain image by means of random walk matrix and then to append diffusion. In this paper, the encryption method with security holes is analyzed by chosen plaintext attack. In addition, this paper improves the original encryption algorithm. The experimental and simulation results show that the improved algorithm has the advantages of the original and can improve the ability to resist attack.
Related Concept Videos
Wald-Wolfowitz Runs Test II
For binary data, runs are identified using symbols such as + and −, or equivalently, 1s and...
Entropy Change in Reversible Processes
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.
Wald-Wolfowitz Runs Test I
The test works...
Entropy
Entropy and the Second Law of Thermodynamics
The relation between entropy and disorder can be illustrated with the example of the phase change of ice to water. In ice, the molecules are located at specific sites giving a solid state, whereas, in a liquid form, these molecules are much freer to move. The molecular arrangement has therefore become more randomized. Although the change in average...
Convolution: Math, Graphics, and Discrete Signals
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...

