Early 1940: British police listening for radio transmissions from German spies within the UK pick up weird signals, and pass them to
Bletchley Park, the United Kingdom's main decryption establishment in WWII. The source of these German messages is an unknown machine, which the Brits dub
Tunny (10 minute video with
Tony Sale describing the Tunny). August 30, 1941: German operators send two very similar messages with the same key, providing insight into the encryption scheme. By January 1942, British cryptographers deduced the workings of the German code machines, sight unseen. The British were able to create their own Tunny emulators to decrypt messages sent by German High Command. After the war, these and other British code-breaking and emulating machines were demolished and/or recycled for parts and their blueprints destroyed, leaving a hole in the history of the British WWII code breaking. Efforts to rebuild the British Tunny emulator started in the 1990s, and quite recently
a Tunny emulator replica was completed.
[more inside]
posted by filthy light thief
on May 30, 2011 -
12 comments
The Reader of Gentlemen's Mail In the spring of 1919, when the father of American cryptography,
Herbert O.
Yardley, drew up a plan for a permanent State Department codebreaking organization — a "
black chamber — he estimated that a modest $100,000 a year would buy a chief (Yardley) and fifty clerks and cryptanalysts. Yardley rented a three-story building in New York City: on East 38th Street just off Fifth Avenue, he put two dozen people to work under civilian cover—as the
Code Compiling Company. His summary dismissal happened in 1929 at the hand of incoming Secretary of State
Henry Stimson, who closed down the
Cipher Bureau with the
casual observation that "
gentlemen do not read each other's mail". The son of a railroad telegrapher, a man with a lively Jazz Age interest in money, good-looking women, and drinks at five, Yardley not only taught his country how to read other people's mail but wrote two of the enduring American books—the memoir
The American Black Chamber (1931), and
The Education of a Poker Player (1957).
posted by matteo
on Apr 22, 2005 -
6 comments
