I think it could be useful to support the SRP (Secure Remote Password)
method of key exchange.

This protocol seems very solid, allowing two parties to authenticate
themselves and arrive at a common session key essentially without
using any encryption at all.  It only relies on modular exponentiation
and SHA (any hash function will do), and should be trivial to
implement given these two capabilities.

Add 3DES for a session cipher, and you have a system for secure
communications totally unhampered by patents and such.

<URL:http://srp.stanford.edu/srp/>

- Harald
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