how can I encrypt audio file or signal using xor

Processes involves, inputing audio on matlab, converting it to binary form (matrix) then encrypting using XOR (probably an otp)

[Geoff Hayes]

davidop - what have you tried so far? Please describe what you have attempted and what problems you are observing.

[Walter Roberson]

Important question: how will you be storing the audio after you encrypt it? Will it be stored as a data file, or will it be stored as an audio file?

[davidop]

I've been able to get the audio file into matlab using the audiorecorder and getaudiodata functions, but I'm having troubles converting the audio data into binary form in which I can easily XOR it. Also, I've a randomly generated key in matrix and binary form using the rand and round functions but I don't know how it would be possible to XOR it with the long array of the audio data I have. @Geoff

[davidop]

I wish to store the audio as both data file and audio file since I would love to listen to the encrypted file and also decrypt it @Roberson

[akshatha Sushma]

can u please share the code for xoring the binary form of .wav into cipher text?

Answer 1

[Walter Roberson]

Use the 'uint8' option of getaudiodata(): you can xor against that.

repmat() your key as many times as you need to be exactly as long as your binary signal, and then you can xor on that.

[davidop]

I would try that and see wat happens. Thanks

[Elyaser Ben Guno]

sir, how to reconstruct uint8 audio data into audio file? as audio file requires double / floating datatype so it can be played

[Walter Roberson]

Audio files do not require double / floating point to be played.

You read (most) audio files as integer instead of double by adding the option 'native' top audioreader()

You can pass uint8 data to audiowriter() and it will write them to the file.

You can play uint8 data with audioplayer()

[Elyaser Ben Guno]

thanks sir, it works