I need code for image encryption using Rc4

Please I need code of RC4 to image encryption ..

Thanks.

Answer 1

[kareem ahmed]

It is a link to full project developed by me to implement RC4 in matlab

https://www.youtube.com/watch?v=qy7mUyTlelY

[sajjad leith]

this code for encrypt text not image

[Walter Roberson]

If you read an image as uint8 and then you char() the uint8 then the result will be text that the algorithm could be applied to.

[Mohammed Ali]

Walter roberson how i can do that?

[Walter Roberson]

img = imread('flamingos.jpg');
S = char(reshape(img, 1,[]));
encrypted = kareems_RC4(S);

[Mohammed Ali]

where to put it ?

KSA or

main_script

PRGA

and sorry

[Walter Roberson]

At 10 minutes into the video, the author is creating a new script and has just assigned

plaintext = 'Mission accomplished';

You would replace that with

img = imread('flamingos.jpg');
plaintext = char(reshape(img, 1,[]));

[Mohammed Ali]

Thanks so much I really appreciate it

[Mohammed Ali]

Sorry it doesn't work can you send the code in my email [e-mail]

[Walter Roberson]

In my country it would be illegal for me to send anyone encryption code unless I knew for a fact that they were physically present in my country.

[Mohammed Ali]

Ah ok When i did what you tell me img = imread('flamingos.jpg'); plaintext = char(reshape(img, 1,[])); I did get error in the commond img=imread('flamingos.jpg');

[Mohammed Ali]

key = 'KAREEM';
img =imread('Flamingos.jpg');
plaintext = char(reshape(img, 1,[]));

Z = uint8(PRGA(KSA(key), size(plaintext,2)));

P = uint8(char(plaintext));

res = bitxor(Z, P);

%printing result in hex and unicode
res_in_hex = mat2str(dec2hex(res,2))
res_in_unicode = char(res)

it said error in img

[Walter Roberson]

flamingos.jpg is supplied with the Image Processing Toolbox. Replace flamingos.jpg with the name of the image you want to use.

[Mohammed Ali]

The same problem even when i choose another img

[Mohammed Ali]

What about decryption? How i can do that

[Walter Roberson]

Note that file names might be case sensitive, depending on your configuration. 'Flamingos.jpg' might or might not work when the file name is 'flamingos.jpg'

Which MATLAB release are you using? Sufficiently old MATLAB did not have 'flamingos.jpg' . But 'cameraman.tif' should be present in quite old MATLAB.

I seem to recall that before about R2013a or so, that imread() needed the Image Processing Toolbox.

[Walter Roberson]

What about decryption?

Sorry, I am not permitted to answer that question in more detail than "Call your decryption routine"

Once you have decrypted to a character vector then

bytes = uint8(decrypted_content);
filename = 'restored_image.tif';
[fid, msg] = fopen(filename, 'w');
if fid < 0; error('Could not open file "%s" for writing because "%s"', filename, msg); end
fwrite(fid, bytes, 'uint8');
fclose(fid)

The extension you use for filename should be the same as the original image file extension.

[Mohammed Ali]

Sorry for ask a lot of questions That's just because i have academic project And thank you so much for your help I use matlab 2013