@techreport{ono-sipping-smime-keyreuse-01,
    number =    {draft-ono-sipping-smime-keyreuse-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ono-sipping-smime-keyreuse/01/},
    author =    {Shinya Tachimoto and Kumiko Ono},
    title =     {{Key reuse in Secure MIME for the Session Initiation Protocol(SIP)}},
    pagetotal = 10,
    year =      2005,
    month =     jul,
    day =       20,
    abstract =  {The SIP User Agent uses Secure MIME (S/MIME) Cryptographic Message Syntax (CMS) EnvelopedData to protect SIP messages for confidentiality. While SIP messages can be encrypted with different keying materials for each message in a dialog, 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 simply.},
}