A New Internet-Draft is available from the on-line Internet-Drafts directories.
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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