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The DRYAD sheet is a manual form of authentication and lightweight encryption used for voice communications. Earlier forms of it were used in WWII, and it saw constant use during Korea and Vietnam. I wrote a DRYAD generator software program a year ago, but found a bug that creates the same sheets every time. A new updated version is here: http://citizenmilitem.com/?page_id=200 It includes the source code, so you can modify it or compile your own, and a windows executable. This should still only be used for training purposes, because it uses weak encryption. An explanation of the encryption weakness is here: http://citizenmilitem.com/?p=306 I hope to have a crypto secure version, and eventually a GUI for it, when time permits. Regards DasBlinkenlight