The present invention relates to one kind to execute user equipment (UE) and mobile management node for handling safety problem non access stratum (NAS) signaling between telecommunication network (100), the NAS signaling, and e shields metal. (MME) of mobility management entity realize the solution a kind of device and a kind of method, this method comprises: step, initial non-access layer information is received from (105) that UE (101) is wirelessly communicated and telecommunication network, determine the UE of security context state, determine safety used in the mode of unencryption, the Encryption Algorithm of cryptographic algorithm is set for sky, context Activation message is then sent to UE, Encryption Algorithm is indicated including information, is received from above-mentioned UE context activations confirmation message.
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