A courier left this note folded inside a ferry timetable, and the handler who was meant to collect it never showed. It's a Vigenère cipher, and the keyword is hiding in plain sight.
Vigenère cipher: medium
EKLTJ INMEC YXOYS XDFJX OYAPM ZVEDU LLXCH PF
The keyword is the search for a traitor inside your own agency. It's two four-letter words run together, eight letters in all.
To decode, write the keyword over and over above the cipher text. Number the alphabet from A=0 to Z=25, then subtract each key letter from the cipher letter beneath it, wrapping round past A. Spaces were removed before encryption, and the letters are grouped in fives.
The answer is below.
The paper
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