Think outside the key

Challenge

Estelle was messing around with her computer and she ended up outputting some garbage! Could you figure out what this means?!

Note: The flag is of the format IceCTF{<text>} where <text> is the decrypted text.

iâ‡§fjag8â‡§qvâ‡§qy4â‡§dag8k0qâ‡§ptag86â‡§sâ‡§hecâ‡§lâ‡§c4ag8z3ssag8â‡§q7y66b

flag