This thesis presents the work done during my end-of-study project at Solucom, a French consulting firm. In a first part is introduced a study of different market authentication solutions that are suitable for use on mobile devices. The products are evaluated according to their intrinsic security level, the user experience they provide, their cost, their maturity and their implementation complexity. The second part highlights a mission, carried out on behalf of a major electricity supplier, which consisted in designing an authentication and data access solution, in line with the company's digital transformation program.