wholesale access to the internet, powerful mobile phones and ubiquitous social networking have dramatically increased the amount of private data kept online. In the process, traditional thinking about online security has been rendered obsolete. For instance, more and more people nowadays keep their e-mail messages on third-party servers elsewhere, rather than on their own hard-drives or mobile phones. Many put their personal details, contacts, photographs, locations, likes, dislikes and inner thoughts on Google, Facebook, Twitter, Flickr, Dropbox and a host of other destinations. Bringing online privacy requirements into an age of cloud computing is only fit and proper, and long overdue.