International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: The SIP security enhanced by using pairing-assisted Massey-Omura signcryption

Alexandre M. Deusajute
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Abstract: Voice over IP (or VoIP) has been adopted progressively not only by a great number of companies but also by an expressive number of people, in Brazil and in other countries. However, this crescent adoption of VoIP in the world brings some concerns such as security risks and threats, mainly on the privacy and integrity of the communication. The risks and threats (which we can emphasize the man-in-the-middle attack, because his high danger degree) already exist in the signalling process to the call establishment. This signalling process is executed by specific types of protocols, like SIP (Session Initiation Protocol). After doing a bibliographical revision of the current SIP security mechanisms and analyzing some proposals to improve these mechanisms, we verified that the SIP vulnerability to the man-in-the-middle was not totally solved. Then we propose a new security mechanism for SIP in this paper, aiming both to be an alternative security mechanism and to solve the vulnerability to the man-in-the-middle attack. In our proposal we use a protocol for secure information exchange -- the Massey-Omura protocol -- which, when combined with Pairing-based Cryptography (PBC), provides a high security level for SIP in all its aspects.
  title={The SIP security enhanced by using pairing-assisted Massey-Omura signcryption},
  booktitle={IACR Eprint archive},
  keywords={applications / man-in-the-middle, Massey-Omura, pairing, SIP, VoIP},
  note={ 13926 received 17 Feb 2008},
  author={Alexandre M. Deusajute},