Grehack was missing last year, but Grehack is back ! More talks, more challenges and more free food ! The 3rd International Symposium on Research in Grey-Hat Hacking - aka GreHack - will be held in Grenoble, France on November 20th, 2015. It will, as always, gather researchers and practitioners from academia, industry, and government to discuss new advances in research related to any area of computer and information security.