at the moment it is not possible to access Sugarsync files from an iPad/iPhone. We are steadily increasing the list of supported storage provider and the more user are interested in a specific storage provider the faster it will be included. At the moment we will include Google Drive and Microsoft SkyDrive next so I have to please you to be patient until also Sugarsync is included.
Accessing Sugarsync from Mac OS is possible. Just use the Sugarsync software to synchronize your files to your Mac and then BoxCryptor to create an encrypted folder within your synchronized folder.