It's unclear if the US interfered with this specific test, but the tactic is actively being pursued by the US military, according to public statements and Congressional testimony by current and former members of the armed forces.
"It's clear United States policy to develop the cyber capability to disable enemy ballistic missiles," said Greg Austin, a professor at the Australian Centre for Cyber Security at the University of New South Wales.
It's been touted as a cost-saving measure that could be used in conjunction with the traditional ballistic missile defense systems, which cost hundreds of millions of dollars.
How to do it
"We cannot afford to build enough interceptors to engage the quantity of threat missiles which can be presented to us. And even if we could, we can never expect a 100% probability of defeating all of them regardless of the techniques used," Macy said.
As far as what to hack, "there's lots of ways in, which makes it very hard for the defender to know what's being attacked and what's not being attacked," said Austin, who is leading the UNSW's newly-announced Research Group on Cyber War and Peace.
Most missiles have a self-destruct button, which could be activated.
In theory, it could be as simple as infecting systems with corrupted software via a USB thumb drive, says Jai Galliott, a defense analyst and professor at UNSW. Though the question remains how that could physically be done in a country as closed-off as North Korea.
Austin believes a successful hack would most likely target the launch sequencing, which could potentially degrade the launch.
"All you'd have to do in a complex missile launch system is like the (Stuxnet virus in the) Iranian nuclear enrichment facility. Just interfere with a process that creates a physical effect of some sort that then has a destructive effect on the operation of the missile."
That's not to say hacking the missile system is easy -- it would likely require plenty of money and manpower. Pyongyang goes to great lengths to hide its military technology from the rest of the world.
Measuring its efficacy would be difficult, too. A lot can go wrong in a missile launch and it may not always be clear if a launch fails due to meddling or an error on the North Korean side.
Considered a pre-emptive strike?
Its detractors worry the technology could degrade trust between nuclear-armed states -- notably China, Russia and the US -- and alter the balance of already-fragile relationships.
Futter says it will be difficult to convince nations like China and Russia that the US won't use the technology to their detriment.
And there are benefits to having it as a deterrent.
"The downside is that a sudden sense of vulnerability has the potential to make anyone -- Moscow, Beijing, or Pyongyang -- paranoid and unpredictable."
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