p2psp team mailing list archive

[Ilshat Shakirov <im.shakirov@xxxxxxxxx>]

As I said we can assign some reputation parameter to each peer. Let's say
that we exclude peer P from the team if Q > X, where X some threshold value
and

​where I_i = 1 if i-th peer marked peer P as malicious and 0 in the other
case.
w_i can be assigned by the time of existing peer in the team. So if peer
exists in team from the start of streaming, and it hasn't complaints from
the other peers, it has the maximum reputation value (w_i parameter).
So the question is how to choose w_i more optimal (and the threshold value
X respectively).

2015-07-28 1:08 GMT+05:00 Juan Álvaro Muñoz Naranjo <juanalvaro83@xxxxxxxxx>
:

> Hi again,
>
> Also, I wanted to develop heuristic for the excluding malicious peers from
>>>> the team based on the all the team (not only trusted peers). Do you have
>>>> any ideas? I think about smth like: 'exclude peer if more than x% of the
>>>> team marked it as malicious'. Also, we can assign 'reputation' to each
>>>> peer, so some peers will have more influence on the decision of excluding
>>>> peer. What do you think?
>>>>
>>>
> Yeah, we've been considering it. The problem with the x% solution is that
> i can easily turn against us. Imagine the attacker controls a high
> percentage of the nodes in the network (that would be easy, just run a huge
> number of peers > x% in a small number of machines and you've got it) and
> starts complaining against valid peers. The valid peers would be expulsed
> by the splitter. That would be an easy DoS.
>
> So, to reduce the impact of attackers, let's say that we set x to 50%: the
> attacker would need to control more than half of the team in order to
> expulse someone. But let's say the attacker controls 45% of the peers. Not
> enough to expulse anyone, but now he can act inversely: he uses that 45% of
> malicious peers to send corrupted chunks to a set of peers smaller than
> 50%. Those affected legal peers will not be able to play 45% of the
> packets, so they will probably abandon the team due to playback quality
> problems. Again a DoS. And the attackers will not be expulsed since the
> splitter did not receive at least 50% of complaints!
>
> Any idea on this?
>
> Juan
>
>
>
>> Thanks! =)
>>>>
>>>>
>>>> 2015-07-23 2:01 GMT+05:00 Juan Álvaro Muñoz Naranjo <
>>>> juanalvaro83@xxxxxxxxx>:
>>>>
>>>>> Hi Ilshat,
>>>>>
>>>>> first of all thanks for your update, it was very interesting. Just one
>>>>> thing: when the DS technique is completed we'll send the public key under a
>>>>> X.509 certificate format. Ideally this certificate should be signed by a
>>>>> trusted certificate authority and contain information about the
>>>>> organization managing the splitter to offer some degree of trust. The
>>>>> certificate might even be distributed with the software, or be given by the
>>>>> web page if we were in a web player with WebRTC. Otherwise the attacker
>>>>> might send its own public key to the peers impersonating the splitter. But
>>>>> for now it is ok like that.
>>>>>
>>>>> Now, let's get to the point. How to run the experiments. Vicente
>>>>> already suggested the use of tools/create_a_team.sh in a previous message
>>>>> (thank you Vicente!). Also, Cristóbal suggests this:
>>>>> https://github.com/cristobalmedinalopez/p2psp-chunk-scheduling/blob/master/tools/run_experiment.sh
>>>>> These solutions are for experiments in one machine of course, which is
>>>>> enough for us. If you need more peers you should be able to combine several
>>>>> machines by running one script per machine. Of course, we're interested in
>>>>> seeing how peers' buffers are filled with chunks and not in video playback:
>>>>> as you can see, both scripts send the video signal to /dev/null.
>>>>>
>>>>> Which experiment to run? We propose the following: we're interested in
>>>>> average expulsion times for an attacker, and if all of them are expulsed
>>>>> after a given time. Also, the average percentage of gaps in the peers'
>>>>> buffers (so we can see if playback is possible in presence of attackers and
>>>>> after how long). I think you should measure time in terms of sending rounds
>>>>> (you know, one round would be the splitter sending one chunk to every
>>>>> member of the team).
>>>>>
>>>>> So, let's say that you have a team of 100 peers. From that team, a
>>>>> percentage of peers will be malicious: 1%, 10%, 25%, 50%. I imagine a plot
>>>>> in which the X axis is time (number of rounds) and in which we depict:
>>>>> number of remaining malicious peers in the team (because some of them will
>>>>> be expulsed) and average filling of peers' buffers. Ideally, as the number
>>>>> of remaining malicious peers decreases the filling of buffers should
>>>>> increase.
>>>>>
>>>>> Showing the number of complains from peers in the first technique
>>>>> would be also interesting.
>>>>>
>>>>> Another thing to measure would be the percentage of bandwidth used for
>>>>> real multimedia data (this is, how many bytes from the total are really
>>>>> used for transmitting the video). You can compare the baseline (no security
>>>>> measures, just plain video without malicious attackers) against both
>>>>> techniques.
>>>>>
>>>>> So, for running these experiments you'll need to decide which
>>>>> information you want to store from each peer (buffer filling percentage at
>>>>> each iteration, how many malicious peers at each iteration, how many bytes
>>>>> were sent and how many of them were used for video, how many complains
>>>>> arrived to the splitter in every iteration). Am I forgetting anything?
>>>>>
>>>>> My suggestion is run the experiment for the first technique and see
>>>>> how it goes. Make sure to run the experiment more than once, say 5 times,
>>>>> and then get the average of them all.
>>>>>
>>>>> Good work,
>>>>>
>>>>> Juan
>>>>>
>>>>> 2015-07-21 20:06 GMT+02:00 Vicente Gonzalez <
>>>>> vicente.gonzalez.ruiz@xxxxxxxxx>:
>>>>>
>>>>>> Hi Ilshat,
>>>>>>
>>>>>> did you try tools/create_a_team.sh?
>>>>>>
>>>>>> (I tested to run up to 100 peers in my 8HG Mac machine)
>>>>>>
>>>>>> Regards,
>>>>>> Vi.
>>>>>>
>>>>>>
>>>>>> On Sun, Jul 19, 2015 at 8:36 PM Ilshat Shakirov <
>>>>>> im.shakirov@xxxxxxxxx> wrote:
>>>>>>
>>>>>>> Hello!,
>>>>>>>
>>>>>>> Sorry for the long delay.
>>>>>>>
>>>>>>> Here is status update about CIS of rules project:
>>>>>>> http://shakirov-dev.blogspot.ru/2015/07/5-6-7-week.html
>>>>>>>
>>>>>>> Also, I need some help with testing a big (ie, 20 peers)
>>>>>>> p2psp-teams. I want solution that allows to reproduce testing experiments
>>>>>>> easily. So the commenting lines (to remove need in running vlc) is not
>>>>>>> suitable for this.
>>>>>>> I've wrote simple script which runs several peers (in one machine)
>>>>>>> and here is result
>>>>>>> <https://www.evernote.com/shard/s427/sh/0b070670-8de9-4a61-acec-562035cfc3ef/7403917d3ca736eea6d60da8ba23543b>.
>>>>>>> I think it's quite hard to understand smth in this (and reproduce). So,
>>>>>>> what is the best solution for testing p2psp-teams and gather some stats?
>>>>>>>
>>>>>>> Thanks!
>>>>>>>
>>>>>>> 2015-06-25 16:13 GMT+05:00 Vicente Gonzalez <
>>>>>>> vicente.gonzalez.ruiz@xxxxxxxxx>:
>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> On Wed, Jun 24, 2015 at 5:48 PM L.G.Casado <leo@xxxxxx> wrote:
>>>>>>>>
>>>>>>>>>  Hi all,
>>>>>>>>>
>>>>>>>>> El mié, 24-06-2015 a las 16:44 +0500, Ilshat Shakirov escribió:
>>>>>>>>>
>>>>>>>>> Ok; Is there any option run peer without running a player? I'm
>>>>>>>>> going to run all peers in one local machine, is it right?
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>> At this moment, the easiest way to test a lot of peers in one
>>>>>>>> machine is to connect to each peer a NetCat client [
>>>>>>>> http://netcat.sourceforge.net/]. It is not the most efficient
>>>>>>>> solution, but you should be able to run hundreds of peers in a 8GB machine.
>>>>>>>> However, is quite simple to avoid sending the stream in each peer. Just
>>>>>>>> comment (temporally) the code that feeds the player.
>>>>>>>>
>>>>>>>> Regards,
>>>>>>>> Vi.
>>>>>>>> --
>>>>>>>> --
>>>>>>>> Vicente González Ruiz
>>>>>>>> Depto de Informática
>>>>>>>> Escuela Técnica Superior de Ingeniería
>>>>>>>> Universidad de Almería
>>>>>>>>
>>>>>>>> Carretera Sacramento S/N
>>>>>>>> 04120, La Cañada de San Urbano
>>>>>>>> Almería, España
>>>>>>>>
>>>>>>>> e-mail: vruiz@xxxxxx
>>>>>>>> http://www.ual.es/~vruiz
>>>>>>>> tel: +34 950 015711
>>>>>>>> fax: +34 950 015486
>>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>> --
>>>>>> Vicente González Ruiz
>>>>>> Depto de Informática
>>>>>> Escuela Técnica Superior de Ingeniería
>>>>>> Universidad de Almería
>>>>>>
>>>>>> Carretera Sacramento S/N
>>>>>> 04120, La Cañada de San Urbano
>>>>>> Almería, España
>>>>>>
>>>>>> e-mail: vruiz@xxxxxx
>>>>>> http://www.ual.es/~vruiz
>>>>>> tel: +34 950 015711
>>>>>> fax: +34 950 015486
>>>>>>
>>>>>
>>>>>
>>>>
>>>
>>
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