Quantum Key Distribution (QKD) is a rising field of research that aims at solving a very common problem in computer security: the problem of cryptographic key exchange. Nowadays, key distribution problem is solved leveraging algorithms that allow to dynamically generate common secrets starting from shared information. For these algorithms security lies in the difficulty for an adversary to compute mathematical operations needed to recover the generated secret. Nevertheless, advent of quantum computers represents a huge concern for classical security, since it has been proved capable of solving these operations in polynomial time. QKD represents a possible solution to this problem, since it allows to exchange keys between two distant parties in a way that is considered secure against both classical and quantum attacks.