Alexandra Griffin writes:

Is there any software out there on the net for doing real-time, transparent encryption of a PPP link?

Well, there is software for encrypting IP datagrams. There may be PPP encryption out there, since there is now an IETF protocol for doing link encryption for PPP, but I don't follow PPP very closely.

Also, if this link is running at 600kbit/s to 1Mbit/s, how much processing power would be required to keep up (assuming we're using, say, the IDEA cipher)? Would a dedicated 386DX/33-based router on each end be sufficient?

I suspect not, but on the other hand hardware to do this sort of thing is available. The TIS people packaged up swIPe with a 3DES board for some applications a while back, just as an example of concept.

Finally, could someone make a ballpark estimate as to the amount of additional latency that would be added?

Hard to say. Depends on the implementation, your link characteristics, etc. Perry