TheCodeBreakers
Newcastle succumbed overnight to the tobacco habit. It seemed as
though all the males in the coastal population of England had suddenly
and simultaneously developed an irresistible addiction to the weed, so
inexhaustible was the demand for cigars. At the suggestion of the censor,
a check was made; the two businessmen proved to be German spies, and
their orders an open code, in which, say 5,000 Coronas for Newcastle
meant five cruisers lying in that port. On July 30, 1915, the two—
Haicke P. M, Janssen and Wilhelm R. Roos—were executed at the Tower
of London by a firing squad whose triggers were really pulled by an alert
censor.
A second type of open code is the null cipher. Only certain letters or
words of a null cipher's text are significant; for example, every fifth word
or the first letter of every word, with all the other letters and words
serving as nulls to produce the disguise. These usually sound even more
strained than the jargon code
annaabi.ee 
