Time cloak used to hide messages in laser light
A “time cloak” that conceals events rather than objects can hide secret messages through a trick of light, making information invisible to all but the intended recipient.

November 30, 2014 at 03:27AM
via Digg http://www.newscientist.com/article/dn26627-time-cloak-used-to-hide-messages-in-laser-light.html#.VHkJZzHF9Oh