Device authentication by tagging

The invention relates to a method for authenticating a device, comprising a network communication unit and tagging circuit, in a mobile communication network, using a mobile entity comprising a tagging circuit and being authenticated to the mobile communication network. The method comprises the following steps; the mobile entity establishing a connection with the device, using said tagging circuit, exchanging authentication data between the mobile entity and the device using the tagging circuit and authenticating the device to the mobile communication network by submission of exchanged authentication data in the mobile communication network. Thereby, the permissions of a mobile entity may be shared with another device by tagging. The invention also relates to a corresponding mobile entity, device, node and computer program product.