[SlugBug] Secure data transfer

[Jonathan]

Hello all,

I've been asked to find out the best method of secure client/server 
transfer of data.

I've suggested SSL as the obvious method, but I'm struggling to find any 
decent papers on the overheads of such a system, particularly any 
increased bandwidth requirements.

Can any SLugBuggers suggest somewhere I might find such a beast?

TIA,

Jonathan

P.S. For once, Google is quiet :(