  We calculate for the nearest active galactic nucleus (AGN), Centaurus A, the
flux of high energy cosmic rays and of accompanying secondary photons and
neutrinos expected from hadronic interactions in the source. We use as two
basic models for the generation of ultrahigh energy cosmic rays (UHECR) shock
acceleration in the radio jet and acceleration in the regular electromagnetic
field close to the core of the AGN. While scattering on photons dominates in
scenarios with acceleration close to the core, scattering on gas becomes more
important if acceleration takes place along the jet. Normalizing the UHECR flux
from Centaurus A to the observations of the Auger experiment, the neutrino flux
may be marginally observable in a 1 km$^3$ neutrino telescope, if a steep UHECR
flux $\d N/\d E\propto E^{-\alpha}$ with $\alpha=2.7$ extends down to $10^{17}$
eV. The associated photon flux is close to or exceeds the observational data of
atmospheric Cherenkov and $\gamma$-ray telescopes for $\alpha\gsim 2$. In
particular, we find that already present data favour either a softer UHECR
injection spectrum than $\alpha=2.7$ for Centaurus A or a lower UHECR flux than
expected from the normalization to the Auger observations.
