MTC KEY MANAGEMENT FOR KEY DERIVATION AT BOTH UE AND NETWORK
First Claim
1. A communication system comprising:
- an MTC-IWF (MTC (Machine-Type-Communication) Inter-Working Function); and
a UE (User Equipment),wherein the MTC-IWF stores a master key, derives subkeys for confidentiality and integrity protection, and informs the UE about an algorithm for key derivation,wherein the UE derives, by using the algorithm, the master key and the subkeys such that the UE shares the same master key and the same subkeys with the MTC-IWF,wherein security association is established between the UE and the MTC-IWF by using the shared master key and subkeys.
1 Assignment
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Accused Products
Abstract
There is provided a new IWF SMC procedure for establishing security association between an MTC UE (10) and an MTC-IWF (20). The MTC-IWF (20) sends to the UE (10) at least an algorithm identifier which instructs the UE (10) to select one of algorithms for deriving a root key (K_iwf). The UE (10) derives the root key (K_iwf) in accordance with the selected algorithm, and derives at least a subkey for checking the integrity of messages transferred between the UE (10) and the MTC-IWF (20) by using the derived root key (K_iwf). The UE (10) protects uplink messages transmitted to the MTC-IWF (20) with the derived subkey. The MTC-IWF (20) protects downlink messages transmitted to the UE (10) with the same subkey derived at a core network.
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Citations
21 Claims
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1. A communication system comprising:
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an MTC-IWF (MTC (Machine-Type-Communication) Inter-Working Function); and a UE (User Equipment), wherein the MTC-IWF stores a master key, derives subkeys for confidentiality and integrity protection, and informs the UE about an algorithm for key derivation, wherein the UE derives, by using the algorithm, the master key and the subkeys such that the UE shares the same master key and the same subkeys with the MTC-IWF, wherein security association is established between the UE and the MTC-IWF by using the shared master key and subkeys. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An MTC-IWF configured to store a master key, derive subkeys for confidentiality and integrity protection, and inform a UE about an algorithm for key derivation to cause the UE to derive the master key and the subkeys such that the UE shares the same master key and the same subkeys with the MTC-IWF,
wherein security association is established between the UE and the MTC-IWF by using the shared master key and subkeys.
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11. A UE configured to derive, by using an algorithm for key derivation informed from an MTC-IWF, a master key and subkeys for confidentiality and integrity protection such that the UE shares the master key and the subkeys with the MTC-IWF,
wherein security association is established between the UE and the MTC-IWF by using the shared master key and subkeys.
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14-15. -15. (canceled)
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16. A method of securing MTC communication, the method comprising:
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storing, by an MTC-IWF, a master key; deriving, by the MTC-IWF, subkeys for confidentiality and integrity protection; informing, by the MTC-IWF, a UE about an algorithm for key derivation; and deriving, by the UE using the algorithm, the master key and the subkeys such that the UE shares the same master key and the same subkeys with the MTC-IWF, wherein security association is established between the UE and the MTC-IWF by using the shared master key and subkeys. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification