Speech encryption/ Audio Encryption

Discussion in 'MATLAB' started by Raymon, May 16, 2006.

  1. Raymon

    Raymon Guest

    Hi there!

    i'm doing a project on speech encryption and decryption using matlab.

    do anybody can help me with m-code:

    1) recored voice, digitize it and encrypt it into a file.

    2)encrpytion using whatever technique that you can think of, no
    restrictions of any kind.


    so, help me in any way; web, books or any other materials relevant to

    the topic would be helpful

    thanx
     
    Raymon, May 16, 2006
    #1
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  2. Raymon

    michael Guest

    1. this is not so good but what you can do to take microphone and
    regular windows recorder record your self you will have wav file
    2. read the wav file
    3. write small program that computes the lpc coeffcients this is some
    polynom that represent the speech signal what you need to do is
    divide the speech signal to several frames for each frame (50 ms) you
    need to compute the lpc coefficient search for the lpc : linear
    predictive coding tell me how you advance !!! good luck
     
    michael, May 16, 2006
    #2
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  3. Dear Raymon,

    There are a multitude of encryption techniques that available, such
    as DES, RSA and some analogue techniques, such as spectrum shift and
    spectrum inversion. Try looking through your Univeristy library
    (assumming your in academica!), as there a loads of good books on
    this subject.

    Regarding a very simple, try XORing your audio data with a fixed
    value (key) in order to encryt it, and then XOR the encrypted data
    again with your key in order to decrypt it, and obtain your orginal
    data.

    Regards,

    Sanjeev.
     
    Sanjeev Sarpal, May 16, 2006
    #3
  4. Raymon escribió:
    The simpler way for make de encryption is to make a spectral inversion.
    This can be done multiplying de input signal way a carrier and then
    filter de result with a low pass filter with a value of cut frecuency
    the same as the carrier.

    The encryption system and decryption system are equals.

    Javier Vicente Saez
     
    Javier Vicente Saez, May 17, 2006
    #4
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