Preface
We both have an interest in classical ciphers and codebreaking, so it was pretty much inevitable that our paths would cross someday. This happened in October 2009, when we attended the NSA Symposium on Cryptologic History in Laurel, Maryland. During the first networking session, we realized that we had much in common. This was the start of a friendship that is still enduring, although we live in different parts of the world and are separated by about 4,000 miles, as well as lots of water (the Atlantic Ocean), with Elonka in Rockville, Maryland, near Washington, DC, and Klaus in Gelsenkirchen, Germany. We still meet regularly in Maryland at the biennial NSA Symposium on Cryptologic History and other events.
In 2017, on one such visit, ...
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