FIELD: physics.
SUBSTANCE: method comprises the steps of: receiving, by means of the SGSN, a request message sent from the UE; using the SGSN, an authentication vector from the HLR / HSS, where the authentication vector contains the first encryption key and the first integrity key; if the SGSN determines that the UE is of the first type of UE, select an encryption algorithm and an integrity algorithm for the UE and send the selected encryption algorithm and the selected integrity algorithm to the UE; and using the SGSN, a second encryption key and a second integrity key corresponding to the first encryption key and the first integrity key are calculated.
EFFECT: disclosed are a GPRS key enhancement method, an SGSN device, a user device, HLR / HSS, and a GPRS system.
15 cl, 23 dwg
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