The summerschool is organized from September 15-19, Z025, on the campus of the Vrije Universiteit Brussel, Brussels, Belgium. The main lecturers of this edition are Daniele Bartoli (University of Perugia), Anurag Bishnoi (TU Delft), Jozefien D'haeseleer (Ghent University), and Violetta Weger (Technical University of Munich). The topics of the lectures are Finite geometry, polar spaces, incidence geometries, generalized quadrangles, Finite fields, Polynomials, Algebraic varieties, Coding Theory, Code Equivalence, Graph Isomorphism, Cryptography, Complexity Classes, Cryptanalysis, graph theory and extremal graph theory.