Cyck of Cyphers ? Yep I am ! Probably half of my unsolved unfound puzzle caches around Canberra are Cyphers !!
But sometimes if you can’t beat them – join them !
POLYBIUS? BIFID? ENIGMA? There are - apparently - a number of crackers out there that may or may not help with this one.
DIFIR TNEBE ISTRE DNUHR EIVIE
WZLLU NGIZR EIVDN UNUEN TREDN
UHNIE NETSO GIZFN UFDNU IERDT
REDNU HSHCE SNHEZ FNUFG ISSIE
RDDNU FNUFD USETU ORERE NEGIV
And in case this helps – my favourite colour is green 