I want to hide an audio file in a grayscale image. The audio is read in matlab by a simple function but I have to embed the audio file within an LSb of an image. But I'm having difficulty with how to convert it into binary format and after, converting decimal values into binary format. I have tried using dec2bin function but its giving the error as it can be applied only to real positive values. The audio file is our secret file so for its security AES algo is also used.
Does that mean that audio samples are signed integers? How about first segregate positive samples from negative, convert them to binary using dec2bin (using only absolute value) and then use 1's or 2's complement representation to differentiate negative samples from positive ones. Embed the signed binary representation in the the LSBs.
Your audio is probably 16-bit? This can be interpreted several ways. For example as singed values (-32768...32767) or as unsigned values (0...65535).
Simply convert to binary and then encode values: (audio+32768) instead of original audio.
After decoding the (audio+32768) from the image you can subtract 32768 and get original audio.
if you are using matlab, instead of using "wavread" you can open the file with "fopen" command then read the data with "ubit1" precision, here is an example:
FILE =fopen('myaudio.wav');
DATA= fread(FILE,'ubit1');
I have matlab code for Binary conversion and LSB steganography
leave a message if you want the code.
Thanks
Using Matlab
[Y Fs]=wavread(['audio.wav']);
% 32 bits audio samples
samples = Y*32768;
Data Magic Random Bits LSB Audio Steganography Matlab Code
Using Matlab
[Y Fs]=wavread(['audio.wav']);
% 32 bits audio samples
samples = Y*32768;
Data Magic Random Bits LSB Audio Steganography Matlab Code
For Matlab you may use this function
function [binn]=file2bin(FileName)
% Read the file:
FID = fopen(FileName, 'rb');
if FID < 0
%error([ErrID, ':ReadFile'], ['Cannot read file: ', ClearFile]);
msgbox(['Cannot read file: ', FileName],'File Error','Error');
end
Data = fread(FID, Inf, '*uint8');
Data2=Data(:);
bin=dec2bin(Data2,8)';
binn=bin(:);
fclose(FID);
end
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