How to implement the following equations in image encryption
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Renjith V Ravi
el 29 de Dic. de 2016
Comentada: Hina Naz
el 15 de Jun. de 2021
Upto finding D(i,j),I have found below
clear all
close all
clc
im1 = imread('lena.bmp');% Read the input image
im2 = im1;
im2(10,10) = 255; % im2 is the image with one pixel difference
[M N] = size(im1);
r = uint8(randi([0,256],h,w)); % Generate a random matrix for encryption
C1 = bitxor(im1,r); % Encryption-1
% imdec = bitxor(xored,r);
C2 = bitxor(im2,r); % Encryption-2
% find D(i,j)
for i=1:M
for j=1:N
if C1(i,j)== C2(i,j)
D(i,j) =0;
else
D(i,j) =1;
end
end
end
D = uint8(D); % change D to uint8 format
how to find the NPCR and UCAI as shown below
1 comentario
Hina Naz
el 15 de Jun. de 2021
hi, did you complete that code to implement this equation for encryption?
Respuesta aceptada
Walter Roberson
el 29 de Dic. de 2016
2 comentarios
Walter Roberson
el 29 de Dic. de 2016
NPCR = mean(D(:)) * 100;
But watch out: your code expects the image to be grayscale, which might not be true for lena.bmp
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