An article written by Jim Fruchterman published in opensource.com explains why Open source software is more secure than other software.
"Your secure software is open source; doesn't that make it less secure?"
This is a recurring question that we get at Benetech about Martus, our free, strongly encrypted tool for secure collection and management of sensitive information built and provided by the Benetech Human Rights Program. It's an important question for us and for all of our peers developing secure software in today's post-Snowden environment of fear and worry about surveillance. We strongly believe not only that open source is compatible with digital security, but that it's also essential for it.