A few puzzles Anzzwers

A crypto machine, state-of-the art 19th century. Pyramix: A Multi-Purpose Trapdoor for Knapsacks NB: The final section IV of this document contains errors and should be disregarded. This has no bearing on the previous sections. Math subject3 (under construction) Math subject4 (under construction) Math subject 5 (under construction) Math subject6 (under construction)