[Bf-committers] How can I send performance data reliably?

[Eric Cosky]

When all the code is on a machine outside your control, your options are
limited and none are going to guarantee 100% that nobody has messed with the
data. You do have options though. Obfuscate as much as you can is a good
start, but be sure to add marker values to detect when the 'obvious' values
are messed with. 

Unfortunately if it is important to people, they will probably reverse
engineer it. If your obfuscation & marker techniques don't change very often
or very much then it's probably not worth the bother. 

The only real solution to this problem that I can think of is to require a
connection to a server, have the server generate some unique 'seed' data (a
.blend file with a generated image, for example) that must be processed by
the client and automatically submitted, and the server can then timestamp
the submission & verify the results are what they should be given the seed
data. 

A lot of bother imho..

-----Original Message-----
From: bf-committers-bounces at blender.org
[mailto:bf-committers-bounces at blender.org] On Behalf Of Shaul Kedem
Sent: Monday, March 10, 2008 11:05 PM
To: bf-blender developers
Subject: Re: [Bf-committers] How can I send performance data reliably?

Thank you for the idea - but what happens if using an editor, or a
debugger (or other means) I change the information right after the
measurement ?


On Tue, Mar 11, 2008 at 12:15 AM, Jasper Mine <jaspermine at earthlink.net>
wrote:
> Just a quick idea. Obfuscated key in code to encrypt data, some kind
>  of hash code to coincide with database and perhaps a bit overkill,
>  public and private keys for client and dB.
>
>  Jasper
>
>
>
>  On Mar 9, 2008, at 8:35 AM, "Shaul Kedem" <shaul.kedem at gmail.com> wrote:
>
>  > Hi,
>  > I've started thinking about using the work done with the system
>  > information script and python scripts enabling automatic processes to
>  > be executed by blender in order to gather performance data. The next
>  > step would be sending all of this information to a central DB, but I
>  > would like to make sure that no one is tampering with anything in the
>  > process - memory, python scripts, blend files, performance data and so
>  > on - is there some way of doing it either in python or in C?
>  >
>  > The reason I think this is important is that performance testing
>  > tends to become a competitive thing with some people (and companies)
>  > and I want to make absolutely sure no one is tempering with the data,
>  > so the figures will be accurate,
>  >
>  > Thanks,
>  > Shaul
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