signed mail + steganography = ?

What if you couldn't tell when a letter was signed unless you new the  
public key of the person signing it?  How could this be done?  Encode 
the digital signature with steganography.  Is this possible when  
steganography alters the very message you wish to sign?  I don't know. 
  
The benefit of this is signed and unsigned messages look like each other. 
People can't be lazy anymore and just assume the signature is yours.  
Your boss isn't likely going to notice you used pgp to sign your mail. 
  
Peter Baumbach
baumbach@atmel.com

-----BEGIN PGP SIGNED MESSAGE-----


writes Peter Baumbach:
>
>What if you couldn't tell when a letter was signed unless you new the  
>public key of the person signing it?  How could this be done?  Encode 
>the digital signature with steganography.  Is this possible when  
>steganography alters the very message you wish to sign?  I don't know. 
>  
>The benefit of this is signed and unsigned messages look like each other. 
>People can't be lazy anymore and just assume the signature is yours.  
>Your boss isn't likely going to notice you used pgp to sign your mail. 
>  
>Peter Baumbach
>baumbach@atmel.com
> 
>  

What if you were to use a higher number of bits per character than 
ascii?  Then you could use the highest (or lowest) bit for a signature.

This may not be such a good idea for ascii mail, but if there is ever
a real "multi-media" (I _hate_ that term) mail, such as 'ol NeXTmail,
then I can see how it would be easy to squeeze in a signature.

- -nate

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