Yeah, with J3M, it relies on the user to supply their own sensor data, which is obviously problematic if the use case is to prevent forgery (if it's just for archival purposes, it works fine.) With a networked system, the location would be determined from the traffic source or similar. On Mon, Aug 26, 2013 at 5:25 PM, Lee Azzarello <lee@guardianproject.info>wrote:
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 <rich@openwatch.net> 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 <lee@guardianproject.info
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 <rich@openwatch.net> 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
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