S-Box with encryption image

Question

omar A.alghafoor 2020-7-31

评论： Walter Roberson 2023-12-23

Hi .......

there are problem in time for encryption image by s-bos (16*16) GF, how are reduce time execution for this code ,

note : I use RGB for encryption .

x = dec2bin(layer_image(i,j),8);
l = x(1, 1 : 4);
r = x(1, 5 : 8);
ld = bin2dec(l); % row
rd = bin2dec(r); % column
layer_image(i,j)=SBox(ld+1,rd+1);

Answer 1

Aishwarya 2023-12-23

编辑：Walter Roberson 2023-12-23

x = dec2bin(layer_image(i,j),8);
l = x(1, 1 : 4);
r = x(1, 5 : 8);
ld = bin2dec(l); % row
rd = bin2dec(r); % column
layer_image(i,j)=SBox(ld+1,rd+1);

Walter Roberson 2023-12-23

What difference is there between this and what was already posted?