Re: Real-time sound cyphering algorithm

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
Received on Thu Sep 29 21:38:40 2005