Data is transmitted between devices and the workshop over industry standard SSL.
Data is stored upon the highly secured S3 and RDS services that Amazon provide. More information on the security of Amazon Web Services can be discovered here: http://aws.amazon.com/security/
For a more detailed overview, check out our Showcase Platform Security Guide.
(April 2014): With the recent discovery of the heartbleed bug, we've taken all recommended measures to ensure all data continues to be protected.