Public key/3DES datastream software over WAN Bastions

[sdw@lig.net (Stephen D. Williams)]

Has anyone produced software (preferably Unix based) that provides
a public key authenticated, DES/3DES encrypted datastream over WAN
firewalls/bastions?

A typical use would be to connect transaction feeds between two data
centers in a secure, automated way over Internet.

I can't see anything conceptually difficult with it, and it seems the
PGP library could be used to create simple Unix daemons.

sdw
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