  We extend the formalism of cluster state quantum secret sharing, as presented
in Markham and Sanders [Phys. Rev. A 78, 042309 (2008)] and Keet et al. [Phy.
Rev. A 82, 062315 (2010)], to the continuous-variable regime. We show that both
classical and quantum information can be shared by distributing
continuous-variable cluster states through either public or private channels.
We find that the adversary structure is completely denied from the secret if
the cluster state is infinitely squeezed, but some secret information would be
leaked if a realistic finitely squeezed state is employed. We suggest
benchmarks to evaluate the security in the finitely squeezed cases. For the
sharing of classical secrets, we borrow techniques from the continuous-variable
quantum key distribution to compute the secret sharing rate. For the sharing of
quantum states, we estimate the amount of entanglement distilled for
teleportation from each cluster state.
