Spy

The World

The history of invisible ink is finally out in the open

Arts, Culture & Media

Author Kristie Macrakis got interested in invisible ink a few years ago while researching the Stasi, East Germany’s secret police. Now she’s written a history of steganography, or “hidden writing.”

The World

The history of invisible ink is finally out in the open

Arts, Culture & Media
Activists protest NSA surveillance programs in front of the U.S. embassy in Kiev, November 1, 2013.

The NSA gives an old spy trick a modern spin. And it involves radio waves

Global Politics

Spying on the Greens

Surveillance