Here is 1 saying encoded using a letter for letter replacement:

QNA WKUVINUKS QNAZ UOWK OY IX I YDNAES ZKPNTUIHK IV, RAV RKQNUS VDK
NRLINAY XOPVY VDOV QNA OZK O ROPDKENZ, O YNEIPIVNZ, O XZKKWOYNU, OUS
OU OYVDWOVIP, I CUNB UNVDIUT BDOVKLKZ ORNAV QNA.
-- YDKZENPC DNEWKY, "VDK UNZBNNS RAIESKZ"