You can pick the encryption type you want in the advanced settings of the server.
The default is Blowfish - 448bit
Here is the list of encryption types:
Blowfish
DES
DESede
AES
PBEWithMD5AndDES
PBEWithMD5AndTripleDES
Diffie-Hellman key
HmacMD5
HmacSHA1
