Re: [viff-devel] VIFF needs at least 3 players always?
> There is also an Orlandi runtime and a BeDOZa runtime (under > development). They work for 2 parties and guarantee security against > active adversaries (paillier.py is only for passive security). > > Claudio The current implementation of the Orlandi runtime found in orlandi.py unfortunately depends on a 3rd party party package for elliptic curve cryptography that is not open source. So unless you have a special agreement with the owners of that package (http://www.cryptomathic.com) or can find something similar, you won't be able to use it. The BeDOZa runtime is completely open-source, but as Claudio mentions, it is not fully implemented yet. So for now, the only 2-party runtime is the passively secure paillier runtime in paillier.py. Regards, Thomas ___ viff-devel mailing list (http://viff.dk/) viff-devel@viff.dk http://lists.viff.dk/listinfo.cgi/viff-devel-viff.dk
Re: [viff-devel] VIFF needs at least 3 players always?
There is also an Orlandi runtime and a BeDOZa runtime (under development). They work for 2 parties and guarantee security against active adversaries (paillier.py is only for passive security). Claudio 2010/10/7 Mikkel Krøigård : > Citat af Kyung-Wook Hwang : > >> Hello, >> >> This is Kyung Hwang from Columbia University again. I have another >> question. >> >> Does Viff always need at least 3 participants? It seems to me it does. > > That depends on the runtime you use. If you are using the default passive > security runtime, this is based on Shamir secret-sharing. Therefore there > must be at least 3 parties, and the threshold will always be < n/2. > > There is in fact also a two-party runtime based on the Paillier > cryptosystem. You can check it out if you want, it's in paillier.py. > > But basically you have to select a runtime that gives you what you want. If > you want 2-party MPC, you can't use the Shamir sharing based runtime. > >> >> I modified "beginner.py" for two players because that file was >> simplest to modify, but when I ran the two players, I got the >> following errors: >> >> kwhw...@kwhwang-sim1:~/viff-1.0/apps$ python beginner2.py player-2.ini >> 20 --no-ssl >> Seeding random generator with random seed 3781 >> /home/kwhwang/opt/lib/python/viff/prss.py:43: DeprecationWarning: the >> sha module is deprecated; use the hashlib module instead >> import sha >> I am player 2 and will input 20 >> Not using SSL >> Listening on port 9002 >> Starting reactor ### >> >> Program started >> >> Error: [Failure instance: Traceback: : 3 >> /home/kwhwang/opt/lib/python/viff/runtime.py:317:stringReceived >> /home/kwhwang/opt/lib/python/viff/runtime.py:456:identify_peer >> /usr/lib/python2.6/dist-packages/twisted/internet/defer.py:280:callback >> >> /usr/lib/python2.6/dist-packages/twisted/internet/defer.py:354:_startRunCallbacks >> --- --- >> >> /usr/lib/python2.6/dist-packages/twisted/internet/defer.py:371:_runCallbacks >> beginner2.py:69:protocol >> /home/kwhwang/opt/lib/python/viff/passive.py:493:input >> /home/kwhwang/opt/lib/python/viff/passive.py:550:shamir_share >> /home/kwhwang/opt/lib/python/viff/runtime.py:785:_expect_share >> /home/kwhwang/opt/lib/python/viff/runtime.py:749:_expect_data >> /home/kwhwang/opt/lib/python/viff/runtime.py:754:_expect_data_with_pc >> > > As you can see, it's using shamir_share. Shamir sharing requires at least 3 > players. > >> I also modified equality.py for two players to see if it works for >> only two players because that file actually compared only two players' >> inputs but not the third player's so that file essentially needs two >> players. But it gaves errors too with two players. >> >> I think Viff only works with at least three players. Am I correct? > > Same as above :) > > Regards, > Mikkel Krøigård > ___ > viff-devel mailing list (http://viff.dk/) > viff-devel@viff.dk > http://lists.viff.dk/listinfo.cgi/viff-devel-viff.dk > ___ viff-devel mailing list (http://viff.dk/) viff-devel@viff.dk http://lists.viff.dk/listinfo.cgi/viff-devel-viff.dk
Re: [viff-devel] VIFF needs at least 3 players always?
Citat af Kyung-Wook Hwang : Hello, This is Kyung Hwang from Columbia University again. I have another question. Does Viff always need at least 3 participants? It seems to me it does. That depends on the runtime you use. If you are using the default passive security runtime, this is based on Shamir secret-sharing. Therefore there must be at least 3 parties, and the threshold will always be < n/2. There is in fact also a two-party runtime based on the Paillier cryptosystem. You can check it out if you want, it's in paillier.py. But basically you have to select a runtime that gives you what you want. If you want 2-party MPC, you can't use the Shamir sharing based runtime. I modified "beginner.py" for two players because that file was simplest to modify, but when I ran the two players, I got the following errors: kwhw...@kwhwang-sim1:~/viff-1.0/apps$ python beginner2.py player-2.ini 20 --no-ssl Seeding random generator with random seed 3781 /home/kwhwang/opt/lib/python/viff/prss.py:43: DeprecationWarning: the sha module is deprecated; use the hashlib module instead import sha I am player 2 and will input 20 Not using SSL Listening on port 9002 Starting reactor ### Program started Error: [Failure instance: Traceback: : 3 /home/kwhwang/opt/lib/python/viff/runtime.py:317:stringReceived /home/kwhwang/opt/lib/python/viff/runtime.py:456:identify_peer /usr/lib/python2.6/dist-packages/twisted/internet/defer.py:280:callback /usr/lib/python2.6/dist-packages/twisted/internet/defer.py:354:_startRunCallbacks --- --- /usr/lib/python2.6/dist-packages/twisted/internet/defer.py:371:_runCallbacks beginner2.py:69:protocol /home/kwhwang/opt/lib/python/viff/passive.py:493:input /home/kwhwang/opt/lib/python/viff/passive.py:550:shamir_share /home/kwhwang/opt/lib/python/viff/runtime.py:785:_expect_share /home/kwhwang/opt/lib/python/viff/runtime.py:749:_expect_data /home/kwhwang/opt/lib/python/viff/runtime.py:754:_expect_data_with_pc As you can see, it's using shamir_share. Shamir sharing requires at least 3 players. I also modified equality.py for two players to see if it works for only two players because that file actually compared only two players' inputs but not the third player's so that file essentially needs two players. But it gaves errors too with two players. I think Viff only works with at least three players. Am I correct? Same as above :) Regards, Mikkel Krøigård ___ viff-devel mailing list (http://viff.dk/) viff-devel@viff.dk http://lists.viff.dk/listinfo.cgi/viff-devel-viff.dk
