It is provided a core network node, e.g. MME, and a first network node, e.g. a OAM congestion reporting function node, for managing wireless device associated information, in particular for or as part of congestion handling. The nodes are comprised in a wireless communication network, such as a telecommunications network. The core network node obtains the wireless device associated information, encrypts it into an encrypted representation, and sends data comprising the encrypted representation to an OAM system via a RAN. The first network node receives, from the OAM system, the encrypted representation of the wireless device associated information, and decrypts it using one or more decryption keys accessible by the first network node.