standard for stegonography?

[Jeremy Cooper]

> 
> "Pseudo-Stego" can be relatively secure as long as a large number of 
> different hiding schemes/standards are used by the public.  An effective 
> means of ensuring this would be to use the reciever's public-key 
> checksum-value as the standard offset for stego.  The large number of 
> public-keys available make it rather infeasable for one's opponents to try 
> them all.  This, I believe, provides pretty adequate security (assuming one 
> strips any telltale headers off the hidden file beforehand).
>

How many possible checksums are there?  If you use a one byte checksum, 
there are only 256 possible combinations right?  Maybe what I am asking 
is, 'How big is the checksum?' 
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