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We study type II supernova signatures of neutrino mass generation viasymmetry breaking at a scale in the range from keV to MeV. The scalarresponsible for symmetry breaking can be thermalized in the supernova core andrestore the symmetry. The neutrinos from scalar decays have about half theaverage energy of thermal neutrinos and are Bose-Einstein distributed. We findthat, even without a detailed knowledge of the supernova parameters, adiscovery is well within reach at Super-Kamiokande.Comment: Revised calculations and references added. Abstract and conclusions  unchanged. 4 pages, no figure

Probing the Origins of Neutrino Mass with Supernova Data