I read an interesting article about using algorithms to break the old codes of the secretive 18th century Oculists (early opthalmologists):

These societies were the incubators of democracy, modern science, and ecumenical religion. They elected their own leaders and drew up constitutions to govern their operations. It wasn’t an accident that Voltaire, George Washington, and Ben Franklin were all active members. And just like today’s networked radicals, much of their power was wrapped up in their ability to stay anonymous and keep their communications secret.

Kevin Knight's Homepage.

Swedish page for the Copiale Cipher :

The Copiale Cipher is a 105 pages manuscript containing all in all around 75,000 characters. Beautifully bound in green and gold brocade paper, written on high quality paper with two different watermarks, the manuscript can be dated back to 1760-1780. Apart from what is obviously an owner's mark (“Philipp 1866”) and a note in the end of the last page (“Copiales 3”), the manuscript is completely encoded. The cipher employed consists of 90 different characters, comprising all from Roman and Greek letters, to diacritics and abstract symbols. Catchwords (preview fragments) of one to three or four characters are written at the bottom of left–hand pages. Transcription, transliteration and decipherment brought to light a German text obviously related to an 18th century secret society, namely the "oculist order". A parallel manuscript is located at the Niedersächsisches Landesarchiv, Staatsarchiv Wolfenbüttel.


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