Re: Geotemporal Public Key Distribution

27 Aug 2013


      I don't fully understand the model that excludes GPS data as a
provider of a "specific place". Would the GPS satellites and ground
units be an "external" data source? If so, is your assertion that GPS
data from a device's logging app could be forged in transit?

-lee

On Mon, Aug 26, 2013 at 8:12 PM, Rich Jones  wrote:
...
I'm familiar with J3M, but unfortunately none of the current J3M/informacam
techniques actually work, as they have no _external_ verifiability. There
isn't actually any information which ties the media to a place or a time,
it's just information encoded into data which could be applied to any
document at any time. By factoring the network, a geotemporal pkey system
would address this problem. J3M is good for tying information to a specific
device (sort of) - but not to a place or a time.
R
On Mon, Aug 26, 2013 at 4:58 PM, Lee Azzarello 
wrote:
...
Informacam
"InformaCam is a mobile application for Android that enables users to
inflate image and video with extra points of data, or metadata. The
metadata includes information like the user’s current GPS coordinates,
altitude, compass bearing, light meter readings, the signatures of
neighboring devices, cell towers, and wifi networks; and serves to
shed light on the exact circumstances and contexts under which the
digital image was taken. With InformaCam the app starts to behave
almost like Adobe Photoshop or GIMP, supporting non-destructive,
layer-based edits to media built on top of Obscuracam."
https://guardianproject.info/apps/informacam/
There is a sub-project to standardize metadata called j3m.
http://j3m.info/
-lee
On Mon, Aug 26, 2013 at 7:08 PM, Rich Jones  wrote:
...
This is a small, unfinished idea I had, but I'd be interested in hearing
any
feedback anybody here might have to offer. Normally we talk about
cryptography to secure communications, but this is an idea rather about
verifying the authenticity of media.
[Quick backround: OpenWatch is a global citizen media network using
mobile
phones as the basis for a free worldwide press. We care very much about
the
authenticity of citizen media, and have designed some systems which
attempt
to improve the verifiability of citizen media.]
The problem is that sometimes media artifacts are presented as a record
of a
current event, when in fact they from different events. An example of
this
was when images of a marathon race in Istanbul were presented as images
of
the recent Occupy Gezi protests.
Now, imagine the globe divided into a grid coordinate system, say
100,000
units (or perhaps 232, if IP rather than physical address is to be
used).
Based on their physical location, reporters can contact a server and are
assigned a key with which to sign or encrypt their media to. This then
ties
a media object to a physical space. This can be further improved to
include
both time and space by dividing a space-day into a number of units,
suppose
1440, such that different keys would be handed out at different times of
the
day, thus further tying a document to a moment in time as well.
Does anybody know if any systems like this have ever been discussed or
designed in the past? I suppose this is somewhat similar to the
RSA-keyfob
system, although this allows for anonymous access without
pre-arrangement as
well.
R
--
—————————————
Rich Jones
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