Ensafer is described as 'adds a layer of security to Dropbox and other cloud services with end-to-end encryption of files and folders'. There are more than 10 alternatives to Ensafer for a variety of platforms, including Windows, Mac, Android, iPhone and Chrome OS. The best alternative is Encrypto, which is free. Other great apps like Ensafer are Boxcryptor (Freemium), Cryptsync (Free, Open Source), Unicode Crypter (Free) and BoxWrap (Free, Open Source).
Encrypto lets you encrypt files before sending them to friends or coworkers. Just drop a file into Encrypto, set a password, and then send it however you normally would — but this time with added security. It’s free for both Mac and Windows.
CryptSync is a small utility that synchronizes two folders while encrypting the contents in one folder. That means one of the two folders has all files unencrypted (the files you work with) and the other folder has all the files encrypted.
BoxWrap, für Mac und Windows. Schützen Sie Ihre Dateien vor neugierigen Geheimdiensten und Cloud-Anbietern und arbeiten Sie sicher zusammen über Cloud-Dateidienste wie Dropbox, Google Drive, Owncloud etc. - kostenlos.
nCrypted Cloud is a Privacy, Security, and Collaboration solution that gives users full control over their personal and corporate Dropbox data. nCrypted Cloud adds client side encryption to your Dropbox existing data, and does not require you to migrate or move your files.