p2psp team mailing list archive

[Vicente Gonzalez <vicente.gonzalez.ruiz@xxxxxxxxx>]

2015-03-16 15:28 GMT+01:00 Ilshat Shakirov <im.shakirov@xxxxxxxxx>:

> Hello!,
>
> In the simulation, the peer number 1 is an attacker?
>
> Yes, the peer number 1 is malicious peer, peer number 2 is trusted peer.
>
> Btw, I am little bit confused about average number of poisoned chunks
> (P/2, T=1, A=1). It will be P/2 if all the peers immediately get to know
> about malicious peer after the trusted peer receives poisoned chunk. But it
> can't be, trusted peer must send the poisoned chunk to the splitter and
> splitter must send message to the rest of team about malicious peer. While
> trusted peer and splitter messaging, malicious peer will send poisoned
> chunks to the team. I think average number of poisoned chunks in the team
> will be P/2 + C, where C depends on network bandwidth.
>

Well, obviously the latency of the system (including bandwidth issues) are
going to increase the number or poisoned chunks, but I still think that in
average the number of poisoned chunks should be #T/2, where #T is the
number of peers in the team T. However, the simulation will tell us if I am
right or no :-)


>
> I will implement the consecutive sending chunks, and will perform many
> experiments to evaluate this value.
>

Thanks a lot!!

Best,
Vicente.


>
>
> 2015-03-16 2:47 GMT+05:00 Vicente Gonzalez <
> vicente.gonzalez.ruiz@xxxxxxxxx>:
>
>>
>>
>> 2015-03-13 17:56 GMT+01:00 Ilshat Shakirov <im.shakirov@xxxxxxxxx>:
>>
>>> Hello!,
>>>
>>
>> Hi IIshat!
>>
>>
>>>
>>> I just pushed the new version of PeerSIm impl of p2psp-protocol
>>> (lp:~im-shakirov/p2psp/sim).
>>> I have implemented the malicious peers and the CIS of rules (model 1,
>>> STrPe). New log file at the same place -
>>> https://www.dropbox.com/s/dh1cewia6ahyoiy/log.txt?dl=0
>>>
>>>
>> I see. Good work. Only one question. In the simulation, the peer number 1
>> is an attacker?
>>
>>
>>> The first results is that there is some problems to acheive average
>>> number of poision chunks at P / 2 (P is number of peers, as described at
>>> http://p2psp.org/en/p2psp-protocol?cap=indexsu11.xht#x20-160004.11)
>>> There is always P - 1 poisoned chunks in simulation. But to be honest,
>>> now peers send their chunks to the rest of team simultaneously (as
>>> described in fact 1 -
>>> http://p2psp.org/en/p2psp-protocol?cap=indexse2.xht#x4-30002).
>>>
>>
>> Well, the granularity that you are using in the simulation (100 steps of
>> time) can be insufficient to simulate the behaviour we predict in this
>> document (that in average, the half of the peers are going to be poisoned).
>>
>>
>>>
>>> What do you think? Should I to implement the process of sending chunks
>>> (from peers) as consecutive actions? In other words the peer sends
>>> chunks one by one. If so, there is can be acheived the P / 2 number of
>>> poisoned chunks, I think.
>>>
>>>
>> I think so :-)
>>
>> 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