char,string or byte?

hi,i want to know what kind of this output after i encrypted using aes in arduino leonardo. it is char,byte or string?

Message : 
114
encrypted: 
×ë‡>£Ïn~½O1irÐR,

Message : 
115
encrypted: 
œÜ<ŒÉ�¦~¾×µñŠ,

(deleted)

You'd use an array of byte, ie none of the above. If the data is binary ciphertext using unsigned byte types
is a good place to start. You cannot use string, because the null byte is valid, so it cannot mark the end of the
string.

BTW What are you attempting to do?