Who remembers Echelon, the top-secret telecommunications spy network said to be run by the US and allied Anglophone nations, and to be triggered as soon as certain key words or phrases are spoken on the phone?
A lot of you, we'd guess. So it's interesting to note that Pentagon boffins have now stated that perhaps the most intriguing reputed capability of Echelon - the ability to automatically pick out words of interest and flag that conversation up as important to its human masters - doesn't work. Or anyway, it only works on good, clear lines: a noisy or degraded signal frustrates it.
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