  Quantum random number generation (QRNG) is a resource that is a necessity in
the field of cryptography. However, its certification has been challenging. In
this article, we certify randomness with the aid of quantum entanglement in a
device independent setting, where we choose two-photon interference for source
characterisation. The CHSH inequality violation and quantum state tomography
are used as independent checks on the measurement devices. These measures
ensure the unpredictability of quantum random number generation. This work can
be easily extended to faster randomness expansion protocols.
