Abstract
AbstractOne of the services for which SIP was first introduced is the conferencing in large scale. Large-scale conferencing on Internet imposes a lot of load on conference components. In this paper, a technique has been presented for improvement of a secure conference service in SIP. This technique contains improved procedure to establish a centralized SIP conference, which benefits a signaling method that uses a tree technique and a secure plan for using common key rather than public key in SIP conference for reduce processing load in large conference. The security mechanism for this method, uses symmetric cryptography, common key for encryption and digital signature with MAC and in every domain, participants receive their keys from the KDC of the same domain. These KDCs can be completely independent. In addition, some approaches have been presented to prevent denial of service attacks.KeywordsSignaling MessageService AttackLarge ConferenceCentralize ConferenceConference ServerThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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