LSB transform for image encryption

Question

javad danesh 2023-1-21

0
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https://ww2.mathworks.cn/matlabcentral/answers/1898300-lsb-transform-for-image-encryption

回答： Image Analyst 2023-1-22

I want to use LSB transform to encode the message in the image. The length of the bit string is less than the size of the image. I wrote a code, but when the length of the message is less, I don't know how to do the encryption. Thank you for your guidance

clc;

clear;

close all;

img=imread('cameraman.tif');

[m,n]=size(img);

message=randi([0 1],m,n);

em=img;

for i=1:m

for j=1:n

pix=dec2bin(img(i,j),8);

if (message(i,j)==0);

pix(8)='0';

else

pix(8)='1';

end

em(i,j)=bin2dec(pix);

end

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Answer 1

Walter Roberson 2023-1-21

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https://ww2.mathworks.cn/matlabcentral/answers/1898300-lsb-transform-for-image-encryption#answer_1153590

For legal reasons we cannot discuss encryption here.

If you have two arrays and information is being transferred from a shorter array to a larger array, you have a few choices:

you could just stop transferring and leave the larger array to be whatever is appropriate
you could prefix size information into what is being transferred, so that the destination first retrieves the site and then knows how many locations to look at
you could pad with a constant
you could ensure that the data being transferred never includes a particular pattern, and then put the pattern at the place the data stops -- an "end of message" marker