Re: Cryptanalysis in QST

David Wilcox

The books discussed are available from Paul’s (W0RW) radio lending library, plus quite a few more about WWII spies, coding and espionage. Those books are spell binders..... wife got mad because I couldn’t put them down.

David J. Wilcox K8WPE’s iPad

On Dec 10, 2019, at 9:39 PM, Charles Wells <odu1993@...> wrote:

That really sounds like a Playfair variant.  Each party must have the key word(s) to encrypt and decrypt the message.  Operationally that could boil down to each party having the same book available and sent the page/line/word numbers in the message header.

On Tue, Dec 10, 2019, 17:23 n5ib_2 <n5ib@...> wrote:
That is the "book code" or "poem code" that later, due to the efforts of Leo Marks (See "Between Silk and Cyanide") became the WOK (Worked Out Keys)

There is a document in the files section of this group describing them.

Jim, N5IB

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