In section 7.2, page 18 in Chen-Nguyen paper regarding BKZ 2.0, they point out different Hermite factors related to Gentry-Halevi FHE.
More precisely, it is said that the critical Hermite factor for the "large" challenge with lattice dimension $n=32768$ is $\delta = 1.0081^n$.
How is this Hermite factor computed ?