The secret message is reconstructed from the stego MP3
files by subsequent the embedding algorithm in overturn
order. Fig. 4 illustrates the pursued steps to extract the
hidden information and reconstruct the secret message. The
first step consists of checking the private bit of the stego
MP3 file frame. Then n bits data are saved to an array on the
condition that the private bit is ‘1’. Rearrange the array to
form a patchwork which lastly be transformed by inverse
Arnold transform to get the original secret message