As a second key word, NIEDERFREQUENZZAHL is mentioned. I don’t know what the purpose of this key word is. As far as I can see, it is not used in the following encryption process.
The cleartext is the following: WETTER HEUTE BARNET X WOLKEN ZEHN X WIND OST DREI X SICHT GUT X STRASSEN SEHR GLATT DA LEICHTER REG[EN] BEI VIER GRAD FT OST X MORGEN MEHR.
Barnet is a borough of London. The letter X is used as a period. Does FT stand for “Fahrenheit”? If so, it would have been pretty cold (-16 degrees Celsius).
Here’s the cleartext filled into the cross word stencil:
The ciphertext is given as follows:
As you can see, only the letter X is used as null. This certainly weakens the cipher.
I wonder if there are other documents mentioning this crossword cipher. Maybe a reader can help.
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Further reading: The ciphers of the Unabomber
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