Dropbox doesn't support the creation of your own private keys. This helps us ensure that everyone has the ability to easily view and share files on the web.
The security of your data is our highest priority and all files stored on Dropbox servers are encrypted. Learn more about Dropbox security.
Dropbox doesn't provide for client-side encryption. However, Dropbox users are free to add their own encryption. There are many third party applications that provide encryption at both the file and container level. Visit our forums for more information.