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

IJUNJ: AJHIQVN, UQB; KPN PHIK AQBBJK MN UHAP.
UNIAHKSJ: BJ, 'KSD BJK DJ ZNNL QD Q FNCC, BJI DJ FSZN
QD Q APHIAP-ZJJI; MHK 'KSD NBJHVP, 'KFSCC DNITN.