Secret codes have long fascinated people. According to Secret History, a new history of cryptology by Craig Bauer, who was Scholar-In-Residence at the NSA Center for Cryptologic History in 2011-12, cryptography predates the Greeks. Many of these ciphers were relatively simple by today’s standards, involving either transposition or substitution (respectively systems where the letters are moved but not replaced, and where the letters are replaced, eg., A is replaced by Z, etc).
The now fairly well-known Enigma machine, deciphered by British scientists at Bletchley Park (and the subject of many books and a couple of movies) is pictured above. This was a German system of ciphering, used by the German Nazi regime during WWII. Less well-known (but undeservedly so) are the decryptions by the NSA and its predecessor group (The US Army Signals Intelligence Service located at Arlington Hall, a former girl’s school in Virginia) of the so-called Venona…
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