VoIP–some threats


VoIP–some threats, security attacks and security mechanisms

FREE-DOWNLOAD [PDF] L Strand 2009
Voice over IP (VoIP) protocols and technology is a merge of telecom and data
communication

Language identification of encrypted voip traffic: Alejandra y roberto or alice and bob
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Voice over IP ( VoIP ) has become a popular protocol for making phone calls over the Internet. Due to the potential transit of sensitive conversations over untrusted network infrastructure, it is well understood that the contents of a VoIP session should be encrypted

Predictive modeling in a voip system
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An important problem one needs to deal with in a Voice over IP system is server overload. One way for preventing such problems is to rely on prediction techniques for the incoming traffic, namely as to proactively scale the available resources. Anticipating the computational

Detecting Spam in VoIP Networks.
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Voice over IP ( VoIP ) is a key enabling technology for the migration of circuit-switched PSTN architectures to packetbased networks. The problem of spam in VoIP networks has to be solved in real time compared to e-mail systems. Many of the techniques devised for e-mail

Skype VoIP service-architecture and comparison
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Skype is a peer-to-peer (P2P) overlay network for VoIP and other applications, developed by KaZaa in 2003. Skype can traverse NAT and firewall more efficiently than traditional VoIP networks and it offers better voice quality. To find and locate users, Skype uses

An analysis of security threats and tools in SIP-based VoIP systems
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Security tools such as protocol analyzers, vulnerability assessment utilities and security monitoring utilities are among the common tools in a security professionals arsenal. Such tools have reached a high level of dependence among security professionals for evaluating

Assessment of voip service availability in the current internet
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We evaluate the availability of voice over IP ( VoIP ) service typically achieved in the current Internet. Service availability is examined using several metrics, including call success probability, overall packet loss probability, the proportion of time the network is suitable for

Analysis and signature of Skype VoIP session traffic
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Skype is a peer-to-peer VoIP application that has gained substantial popularity since its launch in 2003. However, none of Skypes algorithms or its protocol specification are available for public inspection, which impedes evaluation from a security perspective. In this

Overview on VoIP : Subjective and objective measurement methods
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In this paper we have carried out an accurate overview on Voice over IP QoS evaluation techniques. We have described in a detailed way the most important measurement methods that are subdivided in subjective and objective methods. Subjective measurements (eg

Softspeak: Making VoIP Play Well in Existing 802.11 Deployments.
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Voice over IP ( VoIP ) in 802.11 wireless networks (WiFi) is an attractive alternative to cellular wireless telephony. Unfortunately, VoIP traffic is well known to make inefficient use of such networks. Indeed, we demonstrate that increasing handset deployment has the potential to

GENERATE A KEY FOR AES USING BIOMETRIC FOR VOIP NETWORK SECURITY.
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VoIP technology in general refers to the set of software, hardware and industry standards that enable voice to be transported using the Internet Protocol (IP). The technology is compelling to a wide audience for several reasons: VoIP phone bills are typically cheaper than traditional

A performance study of voip applications: Msn vs. skype
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Internet Protocol) services, researches on VoIP design have attained more and more attention. Compared with a traditional voice service-PSTN (Public Switched Telephony Network), VoIP is able to provide lower cost and more flexibility. However, there are still

On the TCP-friendliness of VoIP traffic
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Recently, some concerns have been raised about whether the increase of UDP traffic due to Skype type of applications will throttle down regular TCP users. This concern comes from the fact that UDP connections are unresponsive to congestion, ie, UDP senders do not reduce

A perceptual quality model for adaptive VoIP applications
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Quality models predict the perceptual quality of services as they calculate subjective ratings from measured parameters. In this paper we present a new quality model that evaluates VoIP telephone calls in order to control their transmission at run-time. In addition to packet

VoIP and Skype security
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All telephone systems in the world use a microphone to turn sound waves into an electrical signals and a speaker to turn electrical signals back into sound waves at the other end. But the techniques used for connecting microphones and speakers has seen considerable

Open source VoIP traffic monitoring
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These days voice over IP ( VoIP ) is quite popular as it is a cost effective ay to reduce telephony costs using the Internet. Although many projects are focusing on developing tools and solutions for building the voice infrastructure, there is very little available in terms of

SoftMAC: Layer 2.5 MAC for VoIP support in multi-hop wireless networks
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VoIP services over multi-hop wireless networks using commercial IEEE 802.11 MAC DCF hardware, and propose a novel software solution, called Layer 2.5 SoftMAC. Our proposed SoftMAC resides between the 802.11 MAC layer and IP layer to coordinate the real-time and

VoIP performance over different interior gateway protocols
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Voice over IP technology integrates data and voice networks and offers flexibility by supplying device interoperability using standards-based protocols. Routing is an essential data networking function that provides an efficient real-time data delivery VoIP requires. Best

Mixed Traffic HSDPA scheduling-Impact on VoIP Capacity.
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IMS Multimedia telephony (MMTel) for cellular sys-tems is currently being standardized in 3GPP. MMTel comprises a number of media components such as voice over IP ( VoIP ), real- time video, text messaging and file sharing. In this paper down-link scheduling performance

A peer-to-peer bare PC VoIP application
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Bare PC computing is a novel approach to computing in which there is no operating system, and applications are provided with direct interfaces to the hardware. Bare PC systems are of particular interest for secure, reliable, and efficient peer-to-peer communication between

A generic technique for voice over internet protocol ( voip ) traffic detection
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Summary Skype, Google Talk, Yahoo voice etc. are all applications that enable the use of the Internet for voice conversations. They offer cost effectiveness and are easy to use, and due to these reasons many new VoIP applications are coming into existence. However, all