A catalyst includes a cyclic imide compound having an N-substituted cyclic imide skeleton represented by following Formula :wherein X is an oxygen atom or a hydroxyl group, and having a solubility parameter of less than or equal to 26 12 as determined by Fedors method. The first message includes a timestamp parameter corresponding to a generic bootstrapping architecture user security settings stored in the BSF. The connection system between the mechanical elements also comprises at least one filiform element forming a member for reciprocal blocking of the two mechanical elements, which is inserted in a space defined by the two opposed annular seats.