Janus Dam Nielsen
Research and Innovationspecialist, PhD.
CENTRE FOR IT-SECURITY
THE ALEXANDRA INSTITUTE LTD.
T +45 40 83 09 10
E janus.niel...@alexandra.dk
W alexandra.dk
See our blog about security at blog.sikkerhed.alexandra.dk
that line of code is fine, provided the runtime
checks that the field or fields you use are large enough and refuses to
run if not. If this check is not done, that's where the bug is instead :-)
regards, Ivan
On 21/04/2010, at 14.42, Janus Dam Nielsen wrote:
Hi VIFF'ers
I think I
Hi Marcel and Viff,
I would have expected you to upgrade your config files to the new
setup instead of modifying VIFF to accept legacy config files, that
cannot be generated any more?
Janus Dam Nielsen
Research and Innovationspecialist
/listinfo.cgi/viff-devel-viff.dk
Janus Dam Nielsen
Research and Innovationspecialist, PhD.
CENTRE FOR IT-SECURITY
THE ALEXANDRA INSTITUTE LTD.
T +45 42 22 93 56
E janus.niel...@alexandra.dk
W alexandra.dk
Some good old-fashioned code review coming up... :-)
Great!
/rev/736ad1d97024
changeset: 1361:736ad1d97024
user: Janus Dam Nielsen janus.niel...@alexandra.dk
date: Wed Oct 28 14:53:51 2009 +0100
summary: Generate_config_files:Added support NaCl implementation
of Paillier
.
Janus Dam Nielsen
Research and Innovationspecialist, PhD.
CENTRE FOR IT-SECURITY
THE ALEXANDRA INSTITUTE LTD.
T +45 42 22 93 56
E janus.niel...@alexandra.dk
W alexandra.dk
On 21/10/2009, at 20.28, Marcel Keller wrote:
Martin Geisler wrote:
Janus Dam Nielsen janus.niel...@alexandra.dk writes:
Hi Marcel,
I am not opposed to your suggestion. However I would like to point
out
that in VIFF you compute on shares and not field elements!
Well, we've actually made
(Secure Multiparty Computation) to Python. See: http://viff.dk/.
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Janus Dam Nielsen
, right? (we have
optparse for that)
I believe that the commandline arguments should be general to all
runtimes.
Janus Dam Nielsen
Research and Innovationspecialist, PhD.
CENTRE FOR IT-SECURITY
THE ALEXANDRA INSTITUTE LTD.
T +45 42 22 93
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Janus Dam Nielsen
Research and Innovationspecialist, PhD.
CENTRE FOR IT-SECURITY
THE ALEXANDRA INSTITUTE LTD.
T +45 42 22
please let me know.
Kind regards,
-Marc
Wed, Jul 29, 2009 at 01:42:09PM +0200, Janus Dam Nielsen wrote:
Hi Marc
I have successfully compiled and run test.py and time.sh.
The results where:
[fagid...@fiona:~/./PyPaillier]$ ./time.sh
Encrypting:
10 loops, best of 3: 132 msec per
Janus Dam Nielsen
RD SCIENTIST, PhD.
CENTRE FOR IT-SECURITY
THE ALEXANDRA INSTITUTE LTD.
T +45 42 22 93 56
E janus.niel...@alexandra.dk
W alexandra.dk
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Janus Dam Nielsen
RD SCIENTIST, PhD.
CENTRE FOR IT-SECURITY
THE ALEXANDRA INSTITUTE LTD.
T +45 42 22 93 56
E janus.niel...@alexandra.dk
W alexandra.dk
and
even
though I had some style-complaints, I think this is great!
Let me know if you have comments for the other patches.
Janus Dam Nielsen
RD SCIENTIST, PhD.
CENTRE FOR IT-SECURITY
THE ALEXANDRA INSTITUTE LTD.
T +45 42 22 93 56
E janus.niel
completing it.
Janus Dam Nielsen
RD SCIENTIST, PhD.
CENTRE FOR IT-SECURITY
THE ALEXANDRA INSTITUTE LTD.
T +45 42 22 93 56
E janus.niel...@alexandra.dk
W alexandra.dk
# HG changeset patch
# User Janus Dam Nielsen janus.niel...@alexandra.dk
# Date 1245394848 -7200
# Node ID 15c0283f7cb6dad3d7a41e9095bb4fd18a30d909
# Parent 8ec45943c12ab91430d03a8895aabc6f64fe7a37
importeret rettelse orlandi_implementation.patch
diff --git a/viff/orlandi.py b/viff/orlandi.py
# HG changeset patch
# User Janus Dam Nielsen janus.niel...@alexandra.dk
# Date 1245394852 -7200
# Node ID 1eb98ef76446e9ef06d8d94e31748fe5cfd2ba82
# Parent 29c28d1a8e5f5647fe97d7b01f5924f3ef006301
Implementation of random share command.
diff --git a/viff/orlandi.py b/viff/orlandi.py
--- a/viff
# HG changeset patch
# User Janus Dam Nielsen janus.niel...@alexandra.dk
# Date 1245394940 -7200
# Node ID 07a8329e75322d482dae15186422dd75e9ddb653
# Parent 4c4228af583fc965fb0722c5b051ffa213152f62
Implementation of input and shift commands.
diff --git a/viff/orlandi.py b/viff/orlandi.py
# HG changeset patch
# User Janus Dam Nielsen janus.niel...@alexandra.dk
# Date 1245394853 -7200
# Node ID 85ae7883768d8367baf57cf3b6647707cb1d9b1d
# Parent 1eb98ef76446e9ef06d8d94e31748fe5cfd2ba82
Implementation of addition command.
diff --git a/viff/orlandi.py b/viff/orlandi.py
--- a/viff
# HG changeset patch
# User Janus Dam Nielsen janus.niel...@alexandra.dk
# Date 1245394917 -7200
# Node ID 4c4228af583fc965fb0722c5b051ffa213152f62
# Parent 85ae7883768d8367baf57cf3b6647707cb1d9b1d
Implementation of subtraction command.
diff --git a/viff/orlandi.py b/viff/orlandi.py
--- a/viff
# HG changeset patch
# User Janus Dam Nielsen janus.niel...@alexandra.dk
# Date 1245395107 -7200
# Node ID 57f6d76d82e375b77293bcc6d54eeb6242686079
# Parent 4c46e8eeb719682da1a91b7ad96e7e902363e204
importeret rettelse triple_test.patch
diff --git a/viff/orlandi.py b/viff/orlandi.py
--- a/viff
# HG changeset patch
# User Janus Dam Nielsen janus.niel...@alexandra.dk
# Date 1245395070 -7200
# Node ID cd787f04de1f3be2e7c969e963ed7bcd94f81305
# Parent a07740da4582869d11ead0f56ae055965aa2b4b0
Implementation of the leak tolerant multiplication command.
diff --git a/viff/orlandi.py b/viff
.
Janus Dam Nielsen
RD SCIENTIST, PhD.
CENTRE FOR IT-SECURITY
THE ALEXANDRA INSTITUTE LTD.
T +45 42 22 93 56
E janus.niel...@alexandra.dk
W alexandra.dk
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I have experienced the same problem/issue.
--
Janus Dam Nielsen
RD Scientist
Alexandra Instituttet
janus.niel...@alexandra.dk
On 23/03/2009, at 15.42, Thomas P Jakobsen wrote:
Hi all,
When I execute the attached VIFF protocol on three servers I would
expect all three to ask me to press
New submission from Janus Dam Nielsen janus.niel...@alexandra.dk:
I would like to see a broadcast method in the Runtime class. The
purpose of the broadcast method should be to distribute a public value
among all parties (or some subset of parties).
A case: All parties in a computation needs
can be
corrupt. I think a protocol of Bracha has in fact already been
implemented in VIFF
regards, Ivan
Quoting Janus Dam Nielsen trac...@viff.dk:
New submission from Janus Dam Nielsen janus.niel...@alexandra.dk:
I would like to see a broadcast method in the Runtime class. The
purpose
New submission from Janus Dam Nielsen janus.niel...@alexandra.dk:
Add a parameter to specify the keysize in the script generate-config-
file.py
--
assignedto: jdn
keyword: simple
messages: 308
nosy: jdn, mg
status: in-progress
title: Specify keysize for generate-config-file.py
type
Hi,
I have made some tests of ElGamal encryption in Python (with some
nontrivial amount of help from Martin thanks)
First test was in bare Python, here an encryption took
time for 1 enc time for 4*10^6 enc
Python : 0,002980 sec : approx. 3 hours and 20 min
GMPY :
In the paper on page two, lower left, we write that each server
party execute identical copies of the server program inn lock-step.
Based on this assumption it is reasonable to consider the server as
having a single well-defined state. However in Viff this is no
longer true due to parallelism.
Hi again,
While reading the progress repot I also looked at the code of the
compiler to get a feeling for what it can and cannot do.
Please correct me if I'm wrong, but it seems to go through a number of
standard phases not related to cryptography. Then there are these
three phases:
Yes
Hi Martin,
I am confused about the notion of security via adversary traces
presented in those papers. It is described via two properties:
* Identity Property: a public state P can only lead to one other
public state P', regardless of the secret state.
* Commutative Property: computing on
If there are any other ideas for optimizations you would like to see
in a compiler for Viff then now is the time to come forward.
--
Janus
Den 15/07/2008 kl. 16.49 skrev Martin Geisler:
Janus Dam Nielsen [EMAIL PROTECTED] writes:
Hi again,
Heres the fruit of half a days work
.
If the choice comes to removing two multiplication then I think it is
preferable to not removing them.
--
Janus
Den 17/07/2008 kl. 14.08 skrev Martin Geisler:
Janus Dam Nielsen [EMAIL PROTECTED] writes:
If there are any other ideas for optimizations you would like to see
in a compiler
--
Janus
Den 15/07/2008 kl. 12.16 skrev Martin Geisler:
Janus Dam Nielsen [EMAIL PROTECTED] writes:
Den 11/07/2008 kl. 22.02 skrev Martin Geisler:
Right, good point! We should do that. Maybe a smart compiler could
do the necessary deductions automatically? [...]
I am not aware of any
Hi again,
Heres the fruit of half a days work :)
Analyzing the expression:
sint n = (a * y + (1 - a) * x);
Yields the following results:
Final result:
((a * y )+ ((1 - a )* x )) cost: 30
(((a * y )+ x )- (x * a )) cost: 30
(((a * y )+ x )- (a * x )) cost: 30
(((a * y )- (a * x ))+ x )
1) Rather than
x = (a * (y + (1 - a) * x)
you want
x = (a * (y - x) + x)
so you shave off a superfluous mult for each assignment.
Right, good point! We should do that. Maybe a smart compiler could do
the necessary deductions automatically? So it would go from
x = a * y + (1 - a) *
:
Janus Dam Nielsen [EMAIL PROTECTED] writes:
I would very much prefer not to get these messages.
Do you mean the messages concerning the homepage?
I really like the idea of publishing such a short summary when changes
are made -- especially because the commit messages are included too
I would very much prefer not to get these messages.
--
Janus
Den 20/02/2008 kl. 15.57 skrev viff-devel@viff.dk:
http://hg.viff.dk/viff.dk/rev/ec341fb94853
changeset: 36:ec341fb94853
user: Martin Geisler [EMAIL PROTECTED]
date: Wed Feb 20 13:00:49 2008 +0100
summary: Filter out
Ohh so it is Turing complete? :)
--
Janus
Den 01/02/2008 kl. 1.52 skrev Martin Geisler:
Janus Dam Nielsen [EMAIL PROTECTED] writes:
Den 31/01/2008 kl. 14.21 skrev Martin Geisler:
If you just want to select between two methods, then this also
works:
class Comb(Base, Mix1, Mix2
Den 31/01/2008 kl. 14.21 skrev Martin Geisler:
If you just want to select between two methods, then this also works:
class Comb(Base, Mix1, Mix2):
foo = Mix1.foo
Brilliant!
--
Janus
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