HOW TO XOR NEGETIVE DECIMAL NUMBER?

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Al Anher Provat
Al Anher Provat on 9 Aug 2022
Commented: Walter Roberson on 10 Aug 2022
My original image size 256*256. I have performed transformation, then i divided the matrix into 4*4 block, then i performed decomposition on each block...output of decomposition was P ans S matrix...i shuffled the elements of p..but now i want to perform xor with s. but my problem is i need to xor a key with s matrix which contain negetive decimal number .. but it showing me error ..
for i=1:16
bi=xor(Dec2bin(smod(i)),Dec2bin(finalkey(i)));
s1(i)= Binary2Dec(bi);
end
  2 Comments
Al Anher Provat
Al Anher Provat on 10 Aug 2022
Smod contains positive+negative double and final key contains decimal number actually.

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Answers (1)

Walter Roberson
Walter Roberson on 9 Aug 2022
Edited: Walter Roberson on 10 Aug 2022
for i=1:16
S = dec2bin(typecast(double(smod(i)), 'uint8'), 8) - '0');
F = dec2bin(typecast(double(finalkey(i)), 'uint8'), 8) - '0'));
bi = xor(S, F);
s1(i) = typecast(uint8(bin2dec(char(bi + '0'))), 'double');
end
  4 Comments
Walter Roberson
Walter Roberson on 10 Aug 2022
Why? Why are you not using dec2bin() ?

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