Open Source Software is at the heart of the internet and as a result much of the core infrastructure on which we all rely is built through collaborative and open development. Many of the open source components on which we rely have evolved over extended periods of time. While open development make public code review easier it also presents unique challenges for the secure development process. In this talk Nicko van Someren, the Linux Foundation CTO, will examine what makes open source security different, where it is easier and where it is harder than close source, and how the Linux Foundation's Core Infrastructure Initiative is working to make it better.