5 Sheet of 20 (100 stamps) Women Cryptologists of World War II Stamps
Description
Postal Service honors all of the women cryptologists of World War II, whose service played an inestimable role in the Allied victory.
The stamp art features an image from a World War II–era WAVES (Women Accepted for Volunteer Service) recruitment poster with an overlay of characters from the “Purple” code. The poster was designed by John Falter (1910–1982), who designed more than 300 recruiting posters during his military service. The Purple code was used by the Japanese government to encrypt diplomatic messages. Genevieve Grotjan, a cryptologist with the U.S. Army’s Signal Intelligence Service, discovered the key to cracking the code in September 1940. Her breakthrough allowed the United States to read and exploit the information conveyed in Japanese diplomatic messages for the duration of the war.
In the pane selvage, seemingly random letters (ZRPH QF UB SWRORJLVWV RIZRUOGZDULL, FLSKHU, DQDOBCH, and VHFUHW) can be deciphered to reveal some keywords. The reverse side of the pane discloses the cipher needed to read the words.
Many women cryptologists were civilians recruited while still in college or working as schoolteachers. Thousands more were military personnel, volunteers who enlisted following the establishment of the Women’s Army Auxiliary Corps in May 1942 and of the WAVES (Women Accepted for Volunteer Emergency Service), part of the U.S. Naval Reserve, in July 1942.
They deciphered Japanese fleet communications, helped prevent German U-boats from sinking vital cargo ships and worked to break the encryption systems that revealed Japanese shipping routes and diplomatic messages. They also built high-speed machines that allowed cryptologists to break German messages encrypted by the Enigma machine, intercepted enemy communications, and ensured that encrypted U.S. messages were secure and error-free—an early form of cybersecurity.
Sworn to secrecy under penalty of treason, the women cryptologists of World War II remained silent about their crucial and far-reaching contributions for decades. Today, they are widely considered STEM pioneers, especially because their wartime work coincided with the development of modern computer technology. Their contributions opened the door for women in the military and have helped shape intelligence and information security efforts for future generations.
Antonio Alcalá served as art director and designer for this stamp.
Value: 68¢ 1-Ounce First-class Rate (Forever)
Issue Date: October 18, 2022
Printing Method: Offset
Format: Pane of 20
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