More than 13,000 Conversos were put on trial during the first 12 years of the Spanish Inquisition. Hoping to eliminate ties between the Jewish community and Conversos, the Jews of Spain were expelled in 1492 ..
A second reason, specifically for using Morse Code during the Second World War, was encoding... Nowadays equipment exists to take an outgoing radio signal and automatically encrypt the data or voices during transmission, this is 'on-line' encryption...
RFID was first used during World War II to identify aeroplanes (IFF: Identify Friendly Foe). The objective was to use the aeroplane's radar signal to read an identification number in order to identify whether they were allies or enemies. During the 1960-70s, RFID systems were still considered a secret technology used by the army to control access into sensitive areas (nuclear plants etc.).