How? As far as the German translation suggests, it's a mistake, a SNAFU, a boo-boo, a foul up.
If the report is correct, and for what it's worth, there's a level of detail including posts directly from the Linux kernel list.
And you can read all about that simply by clicking on this clever Google translation page.
One of our Austrian readers who speaks and writes excellent English has translated the German, and placed it here, if the Googlish translation is doing your brain in.
And if you're a German speaker, you can drink directly from the original report, which is here. µ
Pentagon, more like, er... data-gone
But you should probably still set you messages to private
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More secure protocols will be adopted at Redmond