In the last years, role of technology is becoming more and more important, and an increasing number of IoT (Internet of Things) devices are spread all over the world. The presence of this large number of devices creates an IT security problem, thus communication between them traditionally occurs through the use of asymmetric cryptography, whose keys are distributed by means of a Public Key Infrastructure (PKI). However, traditional PKIs have some downsides as they are defined by a centralized structure, which intrinsically leads to single-point-of-failures and complex revocation mechanisms. The purpose of this thesis is therefore to create a Proof of Concept of a Public Key Infrastructure that is no longer centralized, but distributed by means of the innovative blockchain technology.