**7. Conclusions**

In this chapter, we have attempted to provide a brief overview of device independent QRNGs and QKD systems that exploit Bell test to guarantee privacy and randomness. In a reasonably complete manner, no attempt has however been made to review the field in a systematic and cogent fashion. The realization of device independence based on Bell's inequality violation was discussed. The central idea is to show that device independence of quantum devices is as hard to achieve as loophole-free Bell tests. The performance of such tests requires random generators that are provably secure. While there are large number of reports in the literature where subsets of possible certain loopholes have been closed in certain experiments, there are but a couple of them that claim to have closed all loopholes.
