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Linux FreeSWAN [2] is an implementation of IPSEC & IKE for Linux.
IPSEC is Internet Protocol SECurity. It uses strong cryptography to
provide both authentication and encryption services. Authentication
ensures that packets are from the right sender and have not been
altered in transit. Encryption prevents unauthorised reading of packet
contents.
These services allow you to build secure tunnels through untrusted
networks. Everything passing through the untrusted net is encrypted by
the IPSEC gateway machine and decrypted by the gateway at the other
end. The result is Virtual Private Network or VPN. This is a network
which is effectively private even though it includes machines at
several different sites connected by the insecure Internet.
The IPSEC protocols were developed by the IETF (Internet Engineering
Task Force) and will be required as part of IP Version Six, the next
generation. They are also being widely implemented for IP V4. In
particular, nearly all vendors of any type of firewall or security
software have IPSEC support either shipping or in development. There
are also several open source IPSEC projects. Several companies are
co-operating in the Secure Wide Area Network (S/WAN) project to ensure
that products will interoperate. There is also a VPN Consortium
fostering cooperation among companies in this area.
Our project's primary objective is to help make IPSEC widespread by
providing source code which is freely available, runs on a range of
machines including ubiquitous cheap PCs, and is not subject to US or
other nations' export restrictions.
Links:
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[1] http://www.freeswan.org/
[2] http://melbournewireless.org.au/?FreeSWAN
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