The entitled network operation solution not encrypted of the present invention.The present invention relates to a kind of for handling the solution of the safety problem of Non-Access Stratum (NAS) signaling in telecommunication network (100).NAS signaling executes between user equipment (UE) and the mobile management node of such as mobility management entity (MME).The solution is realized in a device and in method, method comes from and the initial non-access layer information of the telecommunication network UE(101 that wirelessly (105) communicate) the following steps are included: receiving, determine the safe context state of UE, it determines whether to that safe context will not be used for by encryption mode, Encryption Algorithm is arranged to zero Encryption Algorithm, send to UE includes indicating the safe context and activate message of the information of Encryption Algorithm, and receive the safe context from UE and activate confirmation message.