The Silent Text messaging app encrypts and erases messages and files. It lets users specify a time period for which the receiver can view a message before it is erased. It also keeps the keys used to encrypt and decrypt content on the user’s device. The company shut down its privacy-focused email service in early August after Edward Snowden leaks. The leak prompted a vigorous privacy debate and interest in how to better shield electronic communications from spying. It said it would focus instead on real-time mobile communications.”]