The papers in this volume were presented at the 12th International Sym- sium on Stabilization, Safety, and Security of Distributed Systems (SSS), held September 20 22, 2010 at Columbia University, NYC, USA. The SSS symposium is an international forum for researchersand practiti- ers in the design and development of distributed systems with self-* properties: (theclassical)self-stabilizing, self-con?guring, self-organizing, self-managing, se- repairing, self-healing, self-optimizing, self-adaptive, andself-protecting. Research in distributed systems is now at a crucial point in its evolution,...