Support for NSFileProtection Security with AIR iOS?

I have a client with very strict security concerns. We are building a business case study app that will have content stored as XML with the app. The user's activity with the app is to be saved back into the case study XML file. As the title asks, is anyone aware of access to any of the file protection security available in iOS using the AIR File API? There doesn't appear to be any reference in the API docs to file security. The only thing remotely related is the "preventBackup" property for locking files out of the cloud.

If an ANE is the only solution is anyone aware of an applicable ANE?

Thanks,

Chris