> You don't want to be like Ernest Lehmitz, a German spy during World War II who sent otherwise boring letters about himself containing hidden writing about shi

> You don't want to be like Ernest Lehmitz, a German spy during World War II who sent otherwise boring letters about himself containing hidden writing about ship movements. He got caught because the non-secret portion of his letters gave up various minor personal details the FBI correlated and used to find him after intercepting just 12 letters. That's an interesting story, this is the best I found about it: https://www.silive.com/news/2018/07/staten_island_wwii_espionage_c.html https://www.silive.com/news/2018/07/staten_island_wwii_espio...