Searches for Supersymmetry at the LHC and its implication with Dark Matter

Supersymmetry (SUSY) is a theoretically attractive scenario for physics beyond the Standard Model that can provide a suitable Dark Matter candidate in the case R-parity is conserved. If SUSY is realized at the TeV scale, as favored by several arguments, it will be accessible at the Large Hadron Collider (LHC) at CERN within the first few years of data taking. We present search strategies for generic SUSY models with R-parity conservation in the ATLAS detector at the LHC. These inclusive search strategies are based on signatures including missing transverse momentum from undetected neutralinos, multiple jets and leptons or b and tau jets. We show the corresponding discovery reach for the first \ifb of ATLAS data and discuss possible measurements for extracting the masses of the involved SUSY particles including the undetected neutralino.