Mr. Arnold I. Dumey

Co-inventor of the postal sorting machine and cryptanalyst first for SIS and then NSA. During WWII he worked for the Army Signal Corps[1] and at Arlington Hall, headquarters of the US Army's Signal Intelligence Service (SIS) cryptography, under William and Elizabeth Friedman on breaking the German and Japanese codes. Dumey was also the inventor of Hashing. He published the first hashing paper[2] in 1956. Later, as a consultant, he co-invented the postal sorter and wrote the code that is used on the front of all USPS envelopes and packages in order to facilitate delivery. In addition, he developed the first system to charge theater tickets to a credit card over the phone for the League of NY Theaters.