Você pode usar jefsr , uma biblioteca do Java EncFS Reader.
É possível descriptografar arquivos criptografados EncFS únicos com acesso ao arquivo de configuração .encfs6.xml e sem a estrutura de diretório apropriada que foi criada?
Com uma pequena ajuda do Google, encontrei este comentário em uma postagem do blog:
http://pragmattica.wordpress.com/2009/05/10/encrypting-your-dropbox-seamlessly-and-automatically/
Comment by Spence — August 14, 2009 @ 11:44 pm | Reply
I did some reading on this, and without the metadata information included in the .encfs6.xml file, it is impossible to decrypt ANY of the files. If you wanted to decrypt a single file, you would at least need to have a directory with that file, and then the encrypted file that you wanted, with all of the proper directory structure. I haven’t played with this much myself, but I think it might be possible to mount something set up like that, and then you could get at the file. However, since the filename is encrypted, you wouldn’t know which file to download from Dropbox
There is a debug utility that you can use on the command-line to get the decrypted filenames of files, and possibly decrypt them as well, so the situation isn’t hopeless. It would probably just take a lot of playing around to figure this stuff out. If you do invest the time and figure some of this out, maybe write a post about it on your blog and link to it here.
Alguma sugestão?