Several Machine Ciphers and Methods for their Solution

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This is a historic work by American cryptographer William F. Friedman, one of his Riverbank publications. As far as I can determine, this work is not copyrighted. (It was at one time offered for sale by the Agean Park Press, but they do not appear to be in business any longer.

As the copy I own is in near-perfect condition, I was not about to crease the binding to get good photographs of the pages. Therefore, please excuse the curvature in the scanned images. I did my best to minimize it, given my resources.

Link: Several_Machine_Ciphers.pdf

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