The latest versions of iOS 7 have broken a feature for protecting e-mail attachments from intrusion and surveillance. The feature called 'data protection' uses a unique hardware encryption key in combination with a password to protect attachments. The latest versions of iOS 7 fail to work when you try to use the feature.
When reached for comment, Apple said it was aware of the issue and has ETA to fix it.
Having silently broken features that Apple is in no hurry to fix screams clandestine agency tampering, especially with leaked documents claiming a 100% success rate at breaking into iOS devices.