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Insurgents in Iraq have hacked into live video feeds from unmanned American drone aircraft, US media reports say.
Shia fighters are said to have used off-the-shelf software programs such as SkyGrabber to capture the footage.
The hacking was possible because the remotely flown planes have an unprotected communications link.
Obtaining such video feeds could provide insurgents with information about sites the military might be planning to target.
The breach of the Pentagon surveillance system's security is said to have come to light when footage shot by a Predator drone was found on the laptop of an apprehended Iraqi insurgent.
A senior Pentagon official is quoted as saying that although militants were able to view the video, there was no evidence that they were able to jam electronic signals from the aircraft or take control of them.
The unnamed official said the US defence department had addressed the issue by working to encrypt all video feeds provided by drones in Iraq, Afghanistan and Pakistan.
Predator drones can fly for several hours, remotely controlled by pilots thousands of miles away. The aircraft can carry out surveillance and attack targets with on-board missiles.
Pentagon spokesman Bryan Whitman said the US military continually evaluated the technologies it used and quickly corrected any potential problems it discovered.
"There's potential vulnerabilities in all of our systems," he said.
ANALYSIS
Mark Ward, technology correspondent, BBC News
As its name implies, SkyGrabber is a program that grabs data being broadcast by satellites - it acts as a radio for data feeds and lets people tune into different data streams as they might radio stations.
Anyone downloading via a wire only shares that net link with a few neighbours. By contrast, anyone using a satellite net connection effectively shares all the data they are getting with everyone in the area covered by a satellite.
Those other people do not see that data because their PC is only watching for what they want. However, SkyGrabber eavesdrops on all the data being downloaded over a link and turns it back into whole files.
The way that data is sent over the net makes it very easy for anyone to reconstruct files. SkyGrabber has proved popular because it has good filters that let people sort the types of files, mp3, wmv, jpg they want to get.
It also knows about many different satellites and can be re-tuned to look at other data streams - such as those coming from drones.
The downside is that SkyGrabber users only get what other people want.
BBC News - Iraq insurgents 'hack into video feeds from US drones'
Shia fighters are said to have used off-the-shelf software programs such as SkyGrabber to capture the footage.
The hacking was possible because the remotely flown planes have an unprotected communications link.
Obtaining such video feeds could provide insurgents with information about sites the military might be planning to target.
The breach of the Pentagon surveillance system's security is said to have come to light when footage shot by a Predator drone was found on the laptop of an apprehended Iraqi insurgent.
A senior Pentagon official is quoted as saying that although militants were able to view the video, there was no evidence that they were able to jam electronic signals from the aircraft or take control of them.
The unnamed official said the US defence department had addressed the issue by working to encrypt all video feeds provided by drones in Iraq, Afghanistan and Pakistan.
Predator drones can fly for several hours, remotely controlled by pilots thousands of miles away. The aircraft can carry out surveillance and attack targets with on-board missiles.
Pentagon spokesman Bryan Whitman said the US military continually evaluated the technologies it used and quickly corrected any potential problems it discovered.
"There's potential vulnerabilities in all of our systems," he said.
ANALYSIS
Mark Ward, technology correspondent, BBC News
As its name implies, SkyGrabber is a program that grabs data being broadcast by satellites - it acts as a radio for data feeds and lets people tune into different data streams as they might radio stations.
Anyone downloading via a wire only shares that net link with a few neighbours. By contrast, anyone using a satellite net connection effectively shares all the data they are getting with everyone in the area covered by a satellite.
Those other people do not see that data because their PC is only watching for what they want. However, SkyGrabber eavesdrops on all the data being downloaded over a link and turns it back into whole files.
The way that data is sent over the net makes it very easy for anyone to reconstruct files. SkyGrabber has proved popular because it has good filters that let people sort the types of files, mp3, wmv, jpg they want to get.
It also knows about many different satellites and can be re-tuned to look at other data streams - such as those coming from drones.
The downside is that SkyGrabber users only get what other people want.
BBC News - Iraq insurgents 'hack into video feeds from US drones'
