  Observations of distant gamma-ray sources are hindered by the presence of the
extragalactic background light (EBL). In order to understand the physical
processes that result in the observed spectrum of sources, it is imperative
that a good understanding of the EBL is included. In this work, an
investigation into the imprint of the EBL on the observed spectra of high
redshift Fermi-LAT AGN is presented. By fitting the spectrum below $\sim$10
GeV, an estimation of the un-absorbed intrinsic source spectrum is obtained; by
applying this spectrum to data up to 300 GeV, it is then possible to derive a
scaling factor for different EBL models. A second approach uses 5 sources (PKS
0426-380, 4C +55.17, Ton 116, PG 1246+586 and RBS 1432) which were found to
exhibit very high energy emission ($E_{\gamma}>100$ GeV). Through Monte Carlo
simulations it is shown that the observation of VHE photons, despite the large
distances of these objects, is consistent with current EBL models. Many of
these sources would be observable with the upcoming ground based observatory
the Cherenkov Telescope Array (CTA), leading to a better understanding of the
EBL.
