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48 items tagged "voip"
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![Permalink for '[Video] Datamining for Hackers'](/themes/lilina/web//media/mark_off.gif)
21:38
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SecDocs
Authors:
Stefan Burschka Tags:
reverse engineering data mining Skype Event:
Chaos Communication Congress 28th (28C3) 2011 Abstract: This talk presents Traffic Mining (TM) particularly in regard to VoiP applications such as Skype. TM is a method to digest and understand large quantities of data. Voice over IP (VoIP) has experienced a tremendous growth over the last few years and is now widely used among the population and for business purposes. The security of such VoIP systems is often assumed, creating a false sense of privacy. Stefan will present research into leakage of information from Skype, a widely used and protected VoIP application. Experiments have shown that isolated phonemes can be classified and given sentences identified. By using the dynamic time warping (DTW) algorithm, frequently used in speech processing, an accuracy of 60% can be reached. The results can be further improved by choosing specific training data and reach an accuracy of 83% under specific conditions
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21:38
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SecDocs
Authors:
Stefan Burschka Tags:
reverse engineering data mining Skype Event:
Chaos Communication Congress 28th (28C3) 2011 Abstract: This talk presents Traffic Mining (TM) particularly in regard to VoiP applications such as Skype. TM is a method to digest and understand large quantities of data. Voice over IP (VoIP) has experienced a tremendous growth over the last few years and is now widely used among the population and for business purposes. The security of such VoIP systems is often assumed, creating a false sense of privacy. Stefan will present research into leakage of information from Skype, a widely used and protected VoIP application. Experiments have shown that isolated phonemes can be classified and given sentences identified. By using the dynamic time warping (DTW) algorithm, frequently used in speech processing, an accuracy of 60% can be reached. The results can be further improved by choosing specific training data and reach an accuracy of 83% under specific conditions
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21:38
»
SecDocs
Authors:
Stefan Burschka Tags:
reverse engineering data mining Skype Event:
Chaos Communication Congress 28th (28C3) 2011 Abstract: This talk presents Traffic Mining (TM) particularly in regard to VoiP applications such as Skype. TM is a method to digest and understand large quantities of data. Voice over IP (VoIP) has experienced a tremendous growth over the last few years and is now widely used among the population and for business purposes. The security of such VoIP systems is often assumed, creating a false sense of privacy. Stefan will present research into leakage of information from Skype, a widely used and protected VoIP application. Experiments have shown that isolated phonemes can be classified and given sentences identified. By using the dynamic time warping (DTW) algorithm, frequently used in speech processing, an accuracy of 60% can be reached. The results can be further improved by choosing specific training data and reach an accuracy of 83% under specific conditions
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8:04
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Packet Storm Security Misc. Files
Whitepaper called Enumerating and Breaking VoIP. It discusses various enumeration techniques followed by a demonstration of a few VoIP attacks.
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12:48
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Hack a Day
[Tyler] has been using Google Voice extensively for some time now, but he hasn’t quite found a microphone/speaker setup he is happy with. He tried a headset, but that just didn’t do it for him. While browsing around at his local thrift store, he came across an old Model 500 rotary phone for just a [...]
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7:19
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Packet Storm Security Recent Files
Phorensix is a post-login VoIP forensics tool created for Asterisk (tested on Asterisk 1.4.5 to be exact). Phorensix takes a look at a rogue host connecting to a vulnerable account. Who is connecting, where are they coming from, what are they doing to my PBX, what are they doing ON MY PBX.
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7:19
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Packet Storm Security Tools
Phorensix is a post-login VoIP forensics tool created for Asterisk (tested on Asterisk 1.4.5 to be exact). Phorensix takes a look at a rogue host connecting to a vulnerable account. Who is connecting, where are they coming from, what are they doing to my PBX, what are they doing ON MY PBX.
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7:19
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Packet Storm Security Misc. Files
Phorensix is a post-login VoIP forensics tool created for Asterisk (tested on Asterisk 1.4.5 to be exact). Phorensix takes a look at a rogue host connecting to a vulnerable account. Who is connecting, where are they coming from, what are they doing to my PBX, what are they doing ON MY PBX.
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9:28
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Wirevolution
I will be moderating a session at ITExpo West on Monday 4th October at 2:15 pm: “The State of VoIP Peering,” will be held in room 304C.
Here’s the session description:
VoIP is a fact – it is here, and it is here to stay. That fact is undeniable. To date, the cost savings associated with VoIP have largely been enough to drive adoption. However, the true benefits of VoIP will only be realized through the continued growth of peering, which will keep calls on IP backbones rather than moving them onto the PSTN. Not only will increased peering continue to reduce costs, it will increase voice call quality – HD voice, for instance, can only be delivered on all-IP calls.
Of course, while there are benefits to peering, traditional carriers have traditionally not taken kindly to losing their PSTN traffic, for which they are able to bill by the minute. But, as the adoption of IP communications continues to increase – and of course the debate continues over when we will witness the true obsolescence of the PSTN – carriers will have little choice but to engage in peering relationships.
This session will offer an market update on the status of VoIP peering and its growth, as well as trends and technologies that will drive its growth going forward, including wideband audio and video calling.
The panelists are:
This is shaping up to be a fascinating session. Rico can tell us about the hardware technologies that are enabling IP end-to-end for phone calls, and Mark and Grant will give us a real-world assessment of the state of deployment, the motivations of the early adopters, and the likely fate of the PSTN.
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12:45
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remote-exploit & backtrack
Hello everyone I can't seem to find a good place to help me with VOIP testing. The reason I'm interested in VOIP is because I have three computers on my home network that use Magicjack and Skype. Now all I'm asking if someone can point me the right direction.
Thanks for your time.....
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8:34
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Wirevolution
I discussed last September how AT&T was considering opening up the 3G data channel to third party voice applications like Skype. According to Rethink Wireless, Steve Jobs mentioned in passing at this week’s iPad extravaganza that it is now a done deal.
Rethink mentions iCall and Skype as beneficiaries. Another notable one is Fring. Google Voice is not yet in this category, since it uses the cellular voice channel rather than the data channel, so it is not strictly speaking VoIP; the same applies to Skype for the iPhone.
According to Boaz Zilberman, Chief Architect at Fring, the Fring iPhone client needed no changes to implement VoIP on the 3G data channel. It was simply a matter of reprogramming the Fring servers to not block it. Apple also required a change to Fring’s customer license agreements, requiring the customer to use this feature only if permitted by his service provider. AT&T now allows it, but non-US carriers may have different policies.
Boaz also mentioned some interesting points about VoIP on the 3G data channel compared with EDGE/GPRS and Wi-Fi. He said that Fring only uses the codecs built in to handsets to avoid the battery drain of software codecs. He said that his preferred codec is AMR-NB; he feels the bandwidth constraints and packet loss inherent in wireless communications negate the audio quality benefits of wideband codecs. 3G data calls often sound better than Wi-Fi calls – the increased latency (100 ms additional round-trip according to Boaz) is balanced by reduced packet loss. 20% of Fring’s calls run on GPRS/EDGE, where the latency is even greater than on 3G; total round trip latency on a GPRS VoIP call is 400-500ms according to Boaz.
As for handsets, Boaz says that Symbian phones are best suited for VoIP, the Nokia N97 being the current champion. Windows Mobile has poor audio path support in its APIs. The iPhone’s greatest advantage is its user interface, it’s disadvantages are lack of background execution and lack of camera APIs. Android is fragmented: each Android device requires different programming to implement VoIP.
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