first step was International maritime signal flags:
THE FIRST
STEP IS
DONE NOW
DECRYPT
JTPMWFEUIF
GJSTUSJEEMF
the second step was caesar cipher (Rot 1):
ISOLVEDTHE
FIRSTRIDDLE
Caesar ( Rot1)
ABCDEFGHIJKLMNUPQRSTUVWXYZ
BCDEFGHIJKLMNUPQRSTUVWXYZA
RE: Riddle #1 : Some Fun With Flags (SOLVED)