Re: Real-time sound cyphering algorithm
From: Andrew Swallow (am.swallow_at_btopenworld.com)
Date: 05/25/05
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Date: Wed, 25 May 2005 16:59:32 +0000 (UTC)
John Hadstate wrote:
>
> Astier Anisse wrote:
>
>>Hello,
>>My problem is quite simple:
>>I'am willing to find a simple algorithm to cypher a sound:
>>I need the cyphered sound to be audible, but not understandable,
>>and that we can decypher it from a recorded sound (verbatim copy not needed).
>>
>>This seems simple, but in fact, i tried a few algorithms and i had no results.
>
>
>>The objective is to have an output sound that seems to be a random sound.
>>And that we can decypher after recording. "real-time" is achevied by a small
>>buffer (0.5 sec for example).
>>
>
>
> Let me suggest the use of a device known as a "modem" to transmit your
> encrypted data.
>
Try -
Record sound in MP3 digital format
Encrypt the MP3, either as a file or a bit stream
Use a modem to transmit the encrypted data
Receive the data using a second modem
Decrypt the incoming data giving the MP3
Play the MP3 producing the original sound.
AES in CTR mode is a good method of encryption.
Andrew Swallow
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