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1780: Treasonous Ciphered Letter

Wednesday, September 23, 2020
1780: Treasonous Ciphered Letter

23 September 1780: British Major John André was captured with treasonous ciphered letter from Benedict Arnold hidden in his boot.

During the American Revolution, British Major John André joined with American General Benedict Arnold in a scheme to secure British control over the American fortification at West Point, New York. The reward - a large sum of money and a high position in the British army. Arnold was disgruntled with the Continental Army and corresponded with British general Sir Henry Clinton beginning in 1779. In July 1780, Arnold proposed the sale of West Point, a strategic Colonial stronghold, to the British. In a coded message he offered West Point, the garrison and supplies, for £20,000 sterling. Arnold used a dictionary code to create this message. Each word was represented by a three-digit code group. The numbers represented page, column, and word down that column. 12.8.16 represented the 16th word in the first column on page 12 of Nathan Bailey’s Dictionary. (Arnold added 7 to the column number to create 8 or 9 instead of 1 or 2)

Before it could be carried out, however, minutemen captured John André and informed General George Washington of the plot. Arnold managed to evade Washington's arrest warrant, but André was imprisoned at Tappan, New York, and on September 29, 1780, he was found guilty of being behind American lines "under a feigned name and in a disguised habit. He was executed as a spy by Washington's order October 2, 1780.

(Image and portions of text borrowed from www.mountvernon.org)

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The NCMF directly supports the National Cryptologic Museum (NCM), the first public museum in the U.S. Intelligence Community. We think you will agree it is truly a "museum like no other."

Located adjacent to the National Security Agency (NSA) in Maryland, the NCM houses a priceless collection of artifacts that represent our Nation's history in code making and code breaking, as well as a world class library of cryptologic media. The NCMF acquires the best artifacts for the NCM and supports new educational and interactive exhibits.

The NCMF provides exceptional cryptologic programs throughout the year, encourages young minds to explore cryptology and innovation through valued awards, and hosts educational, cryptology-related exhibits at various community events.

As part of the Foundation's partnership with NSA to build the Cyber Center for Education and Innovation - Home of the National Cryptologic Museum (CCEI-NCM), the NCMF also serves as a leader in the field of cybersecurity - striving to provide the best in educational resources and programs.

The NCMF and NCM share a joint three-fold mission to Educate, Stimulate, and Commemorate. Learn more about our MISSION.