I-D ACTION:draft-ono-sipping-end2middle-security-01.txt

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	Title		: End-to-middle security in the Session Initiation Protocol(SIP)
	Author(s)	: K. Ono, S. Tachimoto
	Filename	: draft-ono-sipping-end2middle-security-01.txt
	Pages		: 20
	Date		: 2004-2-18
	
End-to-end encryption for confidentiality services can conflict with
some of the features provided by intermediaries.  For example, if a
SIP UA encrypts the message body by using S/MIME for end-to-end
security, it cannot use features that the proxy employs to inspect
the message body contained in the request.  This situation requires
securing information passed between the UA and an intermediary proxy,
also called 'end-to-middle security', which can work with end-to-end
security.  This document describes a method of achieving
end-to-middle security, allowing a SIP UA to disclose message data to
selected intermediaries and protect the data from being seen by other
intermediaries. It describes how to apply S/MIME CMS EnvelopedData
body for use in end-to-middle security.

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