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Sender Scorecards are conceived as a method to enable different IP Multimedia Subsystem (IMS) domains and networks to exchange trustworthy information on sender identities and other relevant information, to allow discrimination between legitimate and unsolicited IMS communication. The approach uses a secure and interoperable scorecard about the sender of IMS calls. Such a scorecard is generated, transported,...
IP Multimedia Subsystem (IMS) is a common architecture providing real-time and non real-time IP multimedia services. 3GPP IP Multimedia Subsystem is a part of 3G system core network (CN) and provides an IP-based session control capabilities based on Session Initiation Protocol (SIP). Although 3GPP organization defines some security mechanisms to protect IP-based IMS network, there are still some security...
The session initiation protocol (SIP) is an application-layer control protocol for creating, modifying, and terminating sessions with one or more participants in the IP-based telephony environment.Yang et al. and Huang et al. proposed a secure authentication scheme for session initiation protocol.Yang's scheme is based on Deffi-Hellman key agreement scheme and a combination of hash functions. In 2006,...
Voice is, besides email, the major personal communication technology used by employees of an enterprise. Additionally, multimedia communication is getting used more and more in the form of video conferences to decrease travel cost and support environmental protection. Besides oral communication also documents, e.g. presentations, may be shared. Thus sensitive information is likely to be exchanged...
The advent of ubiquitous computing and the convergence of the heterogeneous networks provide new opportunities for the new players to enter the operator market. While network access will be available everywhere, the multitude and diversity of the access operators makes it hard to rely on the old paradigms of static operator relationships guaranteeing the identity of the users end-to-end. Therefore,...
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