Method and apparatus for security key generation for dual connectivity

A wireless terminal, for security key generation for secured communications between the wireless terminal and an assisting base station, the wireless terminal comprising interface circuitry and processing circuitry, wherein the wireless terminal is configured to be dually connected to an anchor base station and the assisting base station, and wherein the processing circuitry is configured to:

• generate an assisting security key, based on a primary security key which is known to the anchor base station and the wireless terminal and a freshness parameter received from the anchor base station in a Radio Resource Control message;
• and
• use the assisting security key in generating one or more additional assisting security keys for encrypting data traffic, wherein the data traffic is sent from the wireless terminal to the assisting base station while the wireless terminal is dually connected to the anchor base station and the assisting base station.