CAMUS aims to facilitate collaboration between people / companies with different interests, with a view to achieving a common goal by proposing techniques to emulate a "virtual third party trust": communication protocols will be defined, which allow a set of actors to behave as if a trusted third party were present: everyone will behave as if he provided all of his confidential information to this virtual third party, who would use it to calculate the desired quantities , and reveal to the different actors only the expected optimization work result and nothing else.