Ben Brooks has a nifty idea of using an encrypted disk image inside Dropbox to store private or potentially embarrassing files. Though this would limit the usefulness of those files on some devices (like iOS), it provides some added security to what many (including myself) believe is a potentially “open” Dropbox service.
Here’s a quick How-To on creating said encrypted image:
- Open Disk Utility.
New > Blank Disk Image.
- Choose a location in your Dropbox folder to save it.
- Enter a Name for your disk image (Secrets maybe?).
- Choose a Size. Your disk image will be limited to this much space and will occupy about this much space in Dropbox. The 40 MB minimum should suffice for a few personal documents.
- Choose a Format (default is Mac OS X Extended (Journaled)).
- Choose an Encryption. You can use either 128-bit AES (faster) or 256-bit AES (slower, more secure).
- Leave the partitions as is.
- Choose an Image Format. Use “read/write disk image” as a sparse disk image doesn’t seem to have any effect for encrypted images.
- Click the Create button.
Enter and verify your password when asked. Pick something good or this whole process is kind of pointless. This password will be saved in your keychain by default, or you can deselect “Remember password (add to keychain)” to avoid that.
If you ever forget your password you won’t be able to retrieve anything in the image.