Counterexample to the $l$-modular Belfiore-Solé Conjecture

Anne-Maria Ernvall-Hytönen, B. A. Sethuraman

We show that the secrecy function conjecture that states that the maximum of the secrecy function of an $l$-modular lattice occurs at $1/\sqrt{l}$ is false, by proving that the 4-m…