Konferenzbeitrag
SIP security
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Text/Conference Paper
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Datum
2004
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Verlag
Gesellschaft für Informatik e.V.
Zusammenfassung
Ubiquitous worldwide broadband Internet access as well the coming of age of VoIP technology have made Voice-over-IP an increasingly attractive and useful network application. Currently the “human-readable” Session Initiation Protocol (SIP) which is based on a simple HTTP-like request/response exchange is steadily gaining headway against the considerably more complex ASN.1 encoded H.323 Multimedia ITU-T standard introduced by the telecom industry some years ago. Unfortunately little attention has been given to the security aspects involved in running a phone connection over the public Internet. This paper gives a comparative overview over the security mechanisms recommended by the SIP standard and presents a practical SIP implementation realized at the Zürcher Hochschule Winterthur (ZHW), based on S/MIME authentication and encryption of the session initiation and ensuing protection of the media channels using the Secure Real-time Transport Protocol (SRTP).