Both, BoxCryptor and EncFS, encrypt the files by block (within a block CBC is used and you can change the block size) and not as a whole. They also encrypt filenames by default (this can be changed), although, you're right, other metadata like timestamps etc. are not encrypted.

A better solution for encrypting Dropbox content is using BoxCryptor (Win) + EncFS (Linux + Mac). Those are file-by-file-encryption tools which encrypt each file individually. No network overhead, simultaneous access is still possible and you can use features like file versioning or undeletion.

http://www.boxcryptor.com/ [boxcryptor.com]
http://www.arg0.net/encfs [arg0.net]

A better solution for encrypting Dropbox content is using BoxCryptor (Win) + EncFS (Linux + Mac). Those are file-by-file-encryption tools which encrypt each file individually. No network overhead and you can still use features like file versioning or undeletion.

http://www.boxcryptor.com
http://www.arg0.net/encfs