Keywords: German microdots World War II Mexico Spain.jpg A NSA photo of microdots taped inside the label of an envelope The envelope was sent by German spies in Mexico City to Lisbon during World War II 1939-45 but intercepted by Allied intelligence http //www nsa gov/about/_files/cryptologic_heritage/publications/wwii/cryptologic_aspects_of_gi pdf World War II 1939-45 author PD-USGov Original upload log en wikipedia German+microdots+World+War+II+Mexico+Spain jpg 2013-05-04 20 04 1LENCE D00600D 1393×1041× 290043 bytes <nowiki>Uploading a public-domain item using File Upload Wizard</nowiki> Germany in World War II |