Frank, I read on the Internet that Liber formed his code In 1863, after a confederate surgeon was arrested and charged with attempting to import yellow fever–infected clothes into the northern parts of the United States during the Civil War. Also the poisoning of wells by retreating Confederate soldiers against advancing Union troops was a concern.

I am surprised that so far, none of our southern friends seem to recognize Liber's name in another context related to the war. Hummm.