The winter school will provide an in depth coverage of lattices and their role in cryptographic constructions. Among other things, we will study the basics of lattices, hard problems on lattices and advanced reductions between problems. In addition, we will study cryptographic constructions based on lattices. These will include encryption, interactive protocols, advanced encryption (identity based and others), and finally recent advances in fully homomorphic encryption. The school program includes approximately 20 hours of lectures, a social dinner and an excursion.