Method for processing a request (REQ1, REQ101) for a terminal (2,102) of a user of a client entity to access a computer resource, said access request comprising an identifier of the user, said computer resource being made available to the client entity by a platform (3,103) of a cloud computing service provider with which the client entity has a registered account protected by at least one parameter authenticating the client entity with the platform called second authentication parameter, said method being intended to be implemented by an authentication and authorization module (5,105) of a server (4,104) situated between the terminal and the platform, said authentication and authorization module being dedicated to said client entity, said server maintaining an account attached to said user of the client entity comprising at least one parameter authenticating the user with the server called first authentication parameter, said processing method comprising, following the reception (E10,E110) of the access request by the server: - a step of authentication (E20,E120) of the user using said at least one first parameter authenticating the user with the server; - a step of verification (E40,E140) of the rights of access of the user to the computer resource during which the authentication and authorization module verifies that the user is authorized to access the computer resource via said terminal by applying to said user and to said resource an access control model and an access control policy corresponding to said model that are obtained by said authentication and authorization module for said client entity; - if the authentication and authorization module determines, in the verification step, that the user is authorized to access the computer resource, a step of sending (E50,E150) to the platform, so as to allow an authentication of the client entity by said platform, of a request (REQ1',REQ101') derived from the access request from said at least one second parameter authenticating the client entity with the platform, and in which the identifier of the user is replaced by an identifier of the client entity; - otherwise, a step (E30,E130) of rejection of the access request. - a step of authentication (E20,E120) of the user using said at least one first parameter authenticating the user with the server; - a step of verification (E40,E140) of the rights of access of the user to the computer resource during which the authentication and authorization module verifies that the user is authorized to access the computer resource via said terminal by applying to said user and to said resource an access control model and an access control policy corresponding to said model that are obtained by said authentication and authorization module for said client entity; - if the authentication and authorization module determines, in the verification step, that the user is authorized to access the computer resource, a step of sending (E50,E150) to the platform, so as to allow an authentication of the client entity by said platform, of a request (REQ1',REQ101') derived from the access request from said at least one second parameter authenticating the client entity with the platform, and in which the identifier of the user is replaced by an identifier of the client entity; - otherwise, a step (E30,E130) of rejection of the access request.