ExtractHiddenByte.m

function byte = ExtractHiddenByte(array,n)
% Function ExtractHiddenByte extracts a specified byte from a 1D array
% which contians hidden information within the least significant digits

% Input:
%   array: A 1D array of values which contains hidden information in the LSBs
%   n: The byte position to extract
% Output:   
%   byte: A 1D array of 8 elements of 1s and 0s representing one byte of
%   information hidden
%
% Author: Henry Huang

i = (n-1)*8+1; % Finding the starting index

A = double(array(i:i+7)); %locating the 8 elements and converting to double for calculations

byte = mod(A,2); % Modulo function with respect to 2

byte = uint8(byte); %Convert back into uint8 class

if size(byte,1) > 1 % If its a column vector, transpose into row vector
    byte = byte.'; 
end 
end