Name of the submission: Spook. Corresponding submitter' name: François-Xavier Standaert. Corresponding submitter' e-mail: fstandae@uclouvain.be. Corresponding submitter' phone number: +3210472565. Corresponding submitter' address: Place du Levant, 3, B1348 Louvain-la-Neuve, Belgium. CONTENT: - Spook.pdf (submission specification, rationale, ...). - Spook_diff_R1R2.pdf (diff. file with the first-round submission). - summary_of_changes_R1R2.txt (list of changes between first-round and second-round submissions). - Reference implementations (for our primary candidate and variants).