Heartbleed made national news recently. If you're not familiar with it, a vulnerability was found in an open-source software library used by most of the web to transmit information securely. This affected credit card transactions and usernames and passwords and had the potential for serious abuse. It has a lot of people wondering how good of an idea it is to use open source security and whether open source applications, like Joomla, are secure. In this post, we'll explore how the "openness" of an application affects its security.