I-D ACTION:draft-ono-sipping-smime-keyreuse-00.txt

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	Title		: Key reuse in Secure MIME for the Session Initiation Protocol(SIP)
	Author(s)	: K. Ono
	Filename	: draft-ono-sipping-smime-keyreuse-00.txt
	Pages		: 12
	Date		: 2004-2-11
	
SIP uses Secure MIME (S/MIME) Cryptographic Message Syntax (CMS)
   EnvelopedData to protect SIP messages for confidentiality. While SIP
   can be encrypted with different keying materials for each message, it
   usually requires a public key operation for each message and the
   computational cost of such operations are relatively expensive. This
   draft proposes a method of bidirectional key exchange to reuse keying
   materials for S/MIME-secured messages in a dialog and use a symmetric
   key mechanism instead of an asymmetric key mechanism such as a public
   key operation. The proposed mechanism also achieves the sharing of
   keying material among multiple entities in a simple way.

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