In order to decrypt a file, two things are required (besides the encrypted file data): the password, and the “.encfs5” control file at the top level of the raw encfs filesystem... The control file contains the filesystem parameters, in addition to encrypted key data which is different for every filesystem.. You need both the password and this control file in order to access the data. If you loose either one, there isn’t anything I can do to help. - https://sites.google.com/a/arg0.net/www/encfsintro
Em suma, como com qualquer sistema de criptografia digno do nome: sem senha / chave, sem dados.