RFC 4322 on Opportunistic Encryption using the Internet Key Exchange (IKE)

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        RFC 4322

        Title:      Opportunistic Encryption using the Internet Key
                    Exchange (IKE)
        Author(s):  M. Richardson, D.H. Redelmeier
        Status:     Informational
        Date:       December 2005
        Mailbox:    mcr@sandelman.ottawa.on.ca, hugh@mimosa.com
        Pages:      44
        Characters: 95412
        Updates/Obsoletes/SeeAlso:    None

        I-D Tag:    draft-richardson-ipsec-opportunistic-17.txt

        URL:        ftp://ftp.rfc-editor.org/in-notes/rfc4322.txt

This document describes opportunistic encryption (OE) as designed and
implemented by the Linux FreeS/WAN project.  OE uses the Internet Key
Exchange (IKE) and IPsec protocols.  The objective is to allow
encryption for secure communication without any pre-arrangement
specific to the pair of systems involved.  DNS is used to distribute
the public keys of each system involved.  This is resistant to
passive attacks.  The use of DNS Security (DNSSEC) secures this
system against active attackers as well.

As a result, the administrative overhead is reduced from the square
of the number of systems to a linear dependence, and it becomes
possible to make secure communication the default even when the
partner is not known in advance.

This memo provides information for the Internet community.  It does
not specify an Internet standard of any kind.  Distribution of this
memo is unlimited.

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Joyce K. Reynolds and Sandy Ginoza
USC/Information Sciences Institute

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