RAGEMASTER is a NSA codeword for a "continuous wave generator" that enables spies to watch what is being displayed on a monitor, by way of active components embedded in the VGA cable that respond to incoming radar signals, modulating the red channel of the video on to re-emitted RF. Timeline The capabilities of RAGEMASTER were detailed in a set of documents published by Der Spiegel on 2013-12-30, concurrent with Jacob Appelbaum's talk at the 30th Chaos Communications Conference. The original documents are dated 2008-07-24, and state that RAGEMASTER devices are already operational and available to USA nationals and members of the Five Eyes alliance.
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