If your application is dealing with sensitive information and you're looking for a way of handling it, but without disclosing it to a 3rd party and without reinventing the wheel by developing your own custom solution, zkBox can help you. You can see zkBox as a privacy-as-a-service solution specifically designed for the situations where you need to store completely anonymously and reliable your encrypted data.
zkBox is taking advantage of the more and more increasing power of the client devices (e.g. faster web browsers) to encrypt the data client side; in the same time is relying on the reliability and the availability offered by the cloud to safely store the encrypted data.
zkBox is designed having security and confidentiality as top priority and not even the zkBox or the Amazon staff will be able to peek at your data. The user is the only one who can access it.