how to encode a bit sequences with key?

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Pham Ngoc Thanh
Pham Ngoc Thanh 2013-8-2
how to encode bit sequences with a key, before embedded into an images ( to enhance the secure) , then extracted and decode with this key to return the first sequences.

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Walter Roberson
Walter Roberson 2013-8-2
nK = 17; %for example, length of key
key_sequence = round(rand(1,nK)); %example key
nB = 50; %for example, length of bit sequence
bit_sequence = round(rand(1,nB)); %example bits
new_bits = zeros(1, nB);
for J = 1 : nB
new_bits(J) = xor( bit_sequence(J), key_sequence(mod(J-1, nK)+1) ); %xor with key
end

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