Editor's Note : This is the sixth installment in a series in which Stratfor discusses the many facets of travel security. Click here for Part 1 , Part 2 , Part 3 , Part 4 , Part 5 and Part 7 . German business magazine Wirtschaftswoche on June 25 reported a novel counterespionage technique used by the board members of a German chemical company, Evonik. In Evonik's executive meetings at the office, everyone must put their cellphones in a metal tin — essentially a cookie jar — to block the phones’ signals and possibly to block their microphones as well. Mobile devices can be accessed remotely via malicious software, known as malware, turning them into listening devices, but the right tin can will act like a Faraday cage to block mobile signals.