Localized authorization system in IP networks

The invention provides a method for bootstrapping a local authorizer of a non-public access network. The local authorizer is arranged for granting access for a client device to the non-public access network. Therefore, the local authorizer includes a credentials database, which is used in authentication and authorization of the client device during access to services or resources of the non-public network. A secret knowledge of the client device is used for generating at least one set of credentials. The bootstrapping method includes the step of uploading the at least one set of credentials to the credentials database of the local authorizer. This upload is performed by the client device at least at first access of the client device to the non-public network. Then the credentials in the credentials database are used for authentication and authorization of the client device during access to the non-public access network.