  In this paper we discuss the possibility to measure the Hubble parameter and
the slope of galaxy density profiles using future supernova data. With future
supernova surveys such as SNAP, large numbers of core collapse supernovae will
be discovered, a small fraction of which will be multiply imaged. Measurements
of the image separation, flux-ratio, time-delay and lensing foreground galaxy
for these systems will provide tight constraints on the slope of galactic halos
as well as providing complementary and independent information to other
cosmological tests with respect to the Hubble parameter.
