The invention relates to a method for sharing the authorization to use specific resources among multiple devices, which resources are accessible via messages on which a secret key operation was applied with a predetermined secret master key d available at a master device 11. In order to provide an optimized sharing of authorization, it is proposed that the master device 11 splits the secret master key d into two parts d.sub.1, d.sub.2. A piece of information relating to the first part d.sub.1 of the secret master key d is forwarded to the slave device 13 for enabling this slave device to perform a partial secret key operation on a message m. The second part d.sub.2 of the secret master key d is forwarded to a server 12 for enabling the server 12 to perform partial secret key operations on a message m received from the slave device 13.