How to xor key with the element by element in an array?

Question

Farah Izzati 2018-4-23

0
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https://ww2.mathworks.cn/matlabcentral/answers/396938-how-to-xor-key-with-the-element-by-element-in-an-array

评论： Stephen23 2018-4-24

hi, Currently i'am doing image encryption for my project. Basically what i want to do is.. XOR key with the first element(done). The answer would XOR with the 2nd element. Next answer will be XOR with the 3rd element and so on. (It is similar to cumsum but i want to do it using XOR)

This is my code..

key = bitxor(bin2dec(strAscii), bitt(1,1))
for r = 1:rw
  for c = 1:cl
    xored = bitxor(key,bitt(r:-1:c))
  end     
end

and the output is xored =

1×0 empty uint8 row vector

I hope somebody could share with me how to do this. because i have been stuck for few days to figure out this.

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Stephen23 2018-4-24

@Farah Izzati: this is not twitter, so I removed the ugly # symbol from your tags, and split them correctly into separate tags. Next time you can do this yourself: simply enter each tag as words, and place a comma to separate the tags. Simple.

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Answer 1

Shounak Shastri 2018-4-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/396938-how-to-xor-key-with-the-element-by-element-in-an-array#answer_316833

在 MATLAB Online 中打开

Here, try this

 I = randi([1,10],5);          %Input matrix
 [m, n] = size(I)              %Size of the input matrix for looping
 key = randi([1,10]);          %Key
 I = uint8(I);                 %Making sure the key and the input matrix have same number of bits
 key = uint8(key);
 for ii = 1 : m
   for jj=  1 : n
      c(ii, jj) = bitxor(key, I(ii,jj));
      key = c(ii, jj);          %Storing the encrypted value as the new key
    end
 end