Time cloaks are so much cooler than invisibility cloaks because they use freaking time to hide things, not silly dumb vision tricks. This new method of using a time cloak is the first that can cloak data at rapid rates. It might change security altogether.
The idea behind a time cloak is sort of simple (well, not really), if you pull light waves apart in time and then compress them back together, it should be possible to create time pockets to cloak things (just trust the theory, it's easier for us small brains to live with). Researchers at Cornell built the first working time cloak by using laser pulses. It was awesome.