Re: Listening to Crypto

From: flip (flip_alpha_at_safebunch.com)
Date: 09/29/04 

Date: Tue, 28 Sep 2004 20:22:06 -0700

"Michael Amling" <nospam@nospam.com> wrote in message
news:lAp6d.2009$Rf1.466@newssvr19.news.prodigy.com...
> flip wrote:
> > Hi All,
> >
> > I am giving a talk that includes some discussion on crypto.
> >
> > Instead of showing a typical figure of plaintext versus ciphertext, I
was
> > wondering if one could "listen" to encrypted music.
> >
> > For example, take B's Sonata (an mp3) and AES encrypt it.
>
> Can you get the resulting ciphertext to be in a valid mp3 format? If
> so, how? If not, how would you play it?
>
> Wouldn't it be better to, say, represent the sound in 8-bit or 16-bit
> PCM form, where all values would be valid? Then the ciphertext is
playable.

Yes, I apologize since I am not an audio person.

That was one of my concerns since there are many gibberish CT characters
that wouldn't translate properly.

I was thinking of using something you suggest.

It would go something like:

a. Use a limited alphabet for the PT and CT.

b. Encrypt using this alphabet.

c. Use Mathematica's Play[list_data] command to play the PT and CT. A
simple Sin[n*t] type Play command.

I then thought that it would be nice to do this using mp3's, but maybe that
was too ambitious.

I like your suggestion above, but don't have the resources to do it (using
an alphabet that translates so you can play both PT and CT).

Maybe I should back-off from the demo since this might take more time than I
have (although I think it would be an interesting exercise).

Thanks for the sanity check.

Flip

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