I-D ACTION:draft-ietf-sip-sec-agree-00.txt

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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Session Initiation Protocol Working Group of the IETF.

	Title		: Security Mechanism Agreement for SIP Sessions
	Author(s)	: J. Arkko et al.
	Filename	: draft-ietf-sip-sec-agree-00.txt
	Pages		: 16
	Date		: 24-Apr-02
	
SIP has a number of security mechanisms for hop-by-hop and end-to-end
protection. Some of the security mechanisms have been built in to the
SIP protocol, such as HTTP authentication or secure attachments. In
these mechanisms there are even alternative algorithms and parameters.
Currently it isn't possible to select which security mechanisms to use
over a connection. In particular, even if some mechanisms such as
OPTIONS were used to make this selection, the selection would be vul¡
nerable against the Bidding-Down attack.  This document defines a
header for negotiating the security mechanisms within SIP. A SIP
entity applying this mechanism must always require some minimum secu¡
rity (i.e. integrity protection) from all communicating parties in
order to secure the negotiation, but the negotiation can agree on
which specific minimum security is used.

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