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The extragalactic background light (EBL) contains important information aboutstellar and galaxy evolution. It leaves imprint on the very high energy$\gamma$-ray spectra from sources at cosmological distances due to the processof pair production. In this work we propose to {\em measure} the EBL directlyby extracting the collective attenuation effects in a number of $\gamma$-raysources at different redshifts. Using a Markov Chain Monte Carlo fittingmethod, the EBL intensities and the intrinsic spectral parameters of$\gamma$-ray sources are derived simultaneously. No prior shape of EBL isassumed in the fit. With this method, we can for the first time to derive thespectral shape of the EBL model-independently. Our result shows the expectedfeatures predicted by the present EBL models and thus support the understandingof the EBL origin.

Measuring the extragalactic background light from very high energy gamma-ray observations of blazars