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Thread Subject:
Speech encryption/ Audio Encryption

Subject: Speech encryption/ Audio Encryption

From: Raymon

Date: 16 May, 2006 00:20:56

Message: 1 of 4

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

Subject: Speech encryption/ Audio Encryption

From: michael

Date: 16 May, 2006 04:42:41

Message: 2 of 4

Raymon wrote:
>
>
> 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
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

Subject: Speech encryption/ Audio Encryption

From: Sanjeev Sarpal

Date: 16 May, 2006 09:16:25

Message: 3 of 4

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.

-----------------------------------------
Dr. Sanjeev Sarpal CEng, MIET
Advanced Solutions Nederland
website: <http://www.advancedsolutions.org>

Subject: Speech encryption/ Audio Encryption

From: Javier Vicente Saez

Date: 17 May, 2006 22:05:35

Message: 4 of 4

Raymon escribió:
> 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

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

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