The biggest thing BitTorrent's Bleep messaging app can offer users is privacy, so it's rightly beefing up that feature even more. In BT's latest engineering blog post, senior software engineer Steven Siloti explains how his team has improved the security of asynchronous offline messages. The feature, which made its way to the app in December 2014, allows a recipient to receive offline messages even if the sender hasn't connected to the internet yet. Previously, both users had to be online for messages to be exchanged -- remember that Bleep doesn't have servers, so that update was a big deal. Anyway, BT's engineers were apparently not content with the security level of offline messages, because if someone manages to steal a user's "offline key," he could unlock every offline message he intercepted from the same user in the past.