Dabbling in the Cryptographic World--A Story This note tells the story of some work that I was involved with, but to which I was not a primary contributor. For reasons that should become clear, the people most involved have not gone public with their results. Still, it is one of the more interesting things I've done and seen. The central events occurred around 1977. Jim Reeds reminds me that the ...

CSP-1500 CSP-1500 Showing M-209 style carrying case, cipher machine, small tube containing ink pads, screwdriver, tweezers, and small tube containing oil. The tubes and tools all fit inside the top cover. CSP-1500 showing the top cover and inner cover opened. DESCRIPTION OF CSP-1500 a.k.a. M-209: The CSP-1500 (M-209 in the Army) is a portable, hand-operated, tape-printing mechanical device ...