  A Sidon set is a subset of an Abelian group with the property that each sum
of two distinct elements is distinct. We construct a small maximal Sidon set of
size $O((n \cdot 2^n)^{1/3})$ in the group $\mathbb{Z}_2^n$, generalizing a
result of Ruzsa concerning maximal Sidon sets in the integers.
