Microservice architecture is the most popular approach to developing applications in the cloud. It is an architectural style where complex applications are composed of small, independent processes that communicate with each other through the use of APIs. It is important in this context to take into account the security aspects related to the communication among these services. A service mesh tool can provide various features such as encryption, authentication, authorization, monitoring tools and traffic control that can ensure secure communication between services of this type. Nowadays, the scenario is further complicated by the fact that companies no longer rely on a single cloud provider: many are the advantages that lead to a shift toward implementations that make use of multiple cloud service providers.