Below is a link to a presentation from this year's Defcon in regards to the inherent insecurity of BGP prefix advertisements on the Internet.  This is of course old news to most of us but still an interesting presentation.

https://www.defcon.org/images/defcon-16/dc16-presentations/defcon-16-pilosov-kapela.pdf

Additionally there was another good presentation in regards to "Developments in Cisco IOS Forensics" that is an interesting read.

https://www.defcon.org/images/defcon-16/dc16-presentations/defcon-16-fx.pdf