[abatz]

In all cases, including the web interface, the app is client-side. When you access the web interface, a Silverlight app is actually downloaded to your browser, so decryption and encryption is always done locally. Once a box has been modified, the box is encrypted locally, saved locally, and then it is uploaded over HTTPS to cloud storage.

With no-compromise security in place, and with the incredible convenience the app affords, it is leaps and bounds better than home brewed solutions like GPG + Dropbox (which I have used for many years prior to switching to Strongbox).

I have found Strongbox so awesome, that I wanted a Terminal/command-line "Strongbox reader", so I recently wrote a Ruby gem and command-line interface for decrypting and reading Strongbox files:

https://github.com/abatko/strongboxio

Just try Strongbox, and I'm sure you'll be quickly impressed. Besides the obvious conveniences, including box sharing, it is possible to transfer ownership (e.g. you start a box, and pass its ownership on to your client). Also, there is an amazing feature planned that will bring cloud password storage to the next level.