If ultrahigh energy cosmic rays (UHECRs) originate from extragalactic<br />
sources, understanding the propagation of the charged particles through<br />
the magnetized large scale structure (LSS) of the universe is crucial<br />
in the search for astrophysical accelerators. Adopting a novel model<br />
based on turbulent dynamo, the strength of the intergalactic magnetic<br />
field is estimated from local dynamic properties of the gas flows in<br />
hydrodynamic simulations of a concordance LCDM universe. With<br />
the model magnetic field, the deflection angle and time delay are<br />
calculated for protons with $E > 10^{19}$ eV propagating through the<br />
large scale structure of the universe, as well as the energy loss due<br />
to interactions with cosmic background radiation. Implications of this<br />
study on the origin of UHECRs will be discussed.