"On This Date in History" Calendar
1931: US Coast Guard Established Cryptanalytic Section
![](https://cdn.firespring.com/images/afc7fdcc-229a-49b0-b611-0a2373360036.jpg)
1 July 1931: At the urging of Elizebeth Friedman, the US Coast Guard established a seven man cryptanalytic section.
Learn more in the NSA Center for Cryptologic History's document - "Listening to the Rumrunners: Radio Intelligence during Prohibition" by David P. Mowry, as well as Elizebeth Friedman's Hall of Honor page. See links below.