then set up a CA with openssl, windows server, etc. rsa encrypted nonces do not provide for nonrepudiation, which is probably why support for their usage is hard to come by.
disclaimer - I am not a cryptographer:
using long pre shared keys, with one for each tunnel (i.e, not using the same key for every tunnel you will create) on a point to point tunnel (that will only be negotiated between two ip addresses, as opposed to a tunnel open for dynamic tunnel creation) is probably at least as secure as rsa nonces, if not more so. I would tend to think it would be more secure, as it should supply nonrepudiation as you can claim that both sides have the same key, and therefore must be liable for their actions.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...