Method and related device for generating group key
First Claim
1. A method for generating a group key, comprising:
- obtaining a group ID of a group to which a machine type communication MTC device of a plurality of MTC devices belongs;
obtaining a group communication root key corresponding to the group ID of the group to which the MTC device of the plurality of MTC devices belongs;
generating a group key corresponding to the group ID according to the group communication root key;
sending the group key encrypted by using an access stratum key of the MTC device to the MTC device, so that the MTC device obtains the group key through decryption according to the access stratum key of the MTC device; and
using the group key to encrypt normal communication with the plurality of MTC devices belonging to the group by the MTC device,wherein the obtaining the group ID of the group to which the MTC device belongs comprises;
receiving, from a mobility management entity MME, a service ID and a service root key corresponding to the service ID, wherein the service ID is a service ID of a service of the MTC device, which is sent to the MME by the MTC device, and the service root key is generated, according to a random number and a set key corresponding to the service ID, by an HSS to which the MTC device belongs, or the service root key is generated according to the random number, the service ID and an exclusive key of one MTC device by the HSS when the HSS receives the service ID from the one MTC device that is forwarded by the MME, and the HSS sends the service root key to the MME; and
determining, according to the service ID, the group ID of the group to which the MTC device belongs; and
the obtaining the group communication root key corresponding to the group ID comprises;
generating the group communication root key corresponding to the group ID according to the service root key.
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Accused Products
Abstract
Embodiments of the present invention provide a method and a related device for generating a group key. The method includes: obtaining a group ID of a group where a machine type communication MTC device is located; obtaining a group communication root key corresponding to the group ID; generating a group key corresponding to the group ID according to the group communication root key; and sending the group key encrypted by using an access stratum key of the MTC device to the MTC device, so that the MTC device obtains the group key through decryption according to the access stratum key of the MTC device. According to the foregoing technical solutions, a base station may allocate, to an MTC device, a group key corresponding to a group where the MTC device is located.
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Citations
10 Claims
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1. A method for generating a group key, comprising:
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obtaining a group ID of a group to which a machine type communication MTC device of a plurality of MTC devices belongs; obtaining a group communication root key corresponding to the group ID of the group to which the MTC device of the plurality of MTC devices belongs; generating a group key corresponding to the group ID according to the group communication root key; sending the group key encrypted by using an access stratum key of the MTC device to the MTC device, so that the MTC device obtains the group key through decryption according to the access stratum key of the MTC device; and using the group key to encrypt normal communication with the plurality of MTC devices belonging to the group by the MTC device, wherein the obtaining the group ID of the group to which the MTC device belongs comprises; receiving, from a mobility management entity MME, a service ID and a service root key corresponding to the service ID, wherein the service ID is a service ID of a service of the MTC device, which is sent to the MME by the MTC device, and the service root key is generated, according to a random number and a set key corresponding to the service ID, by an HSS to which the MTC device belongs, or the service root key is generated according to the random number, the service ID and an exclusive key of one MTC device by the HSS when the HSS receives the service ID from the one MTC device that is forwarded by the MME, and the HSS sends the service root key to the MME; and determining, according to the service ID, the group ID of the group to which the MTC device belongs; and the obtaining the group communication root key corresponding to the group ID comprises; generating the group communication root key corresponding to the group ID according to the service root key. - View Dependent Claims (2, 3, 4, 5)
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6. A base station, comprising:
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a processor, configured to obtain a group ID of a group to which a machine type communication MTC device of a plurality of MTC devices belongs; the processor, configured to obtain a group communication root key corresponding to the group ID of the group to which the MTC device of the plurality of MTC devices belongs; the processor, configured to generate a group key corresponding to the group ID according to the group communication root key; and a transmitter configured to send the group key encrypted by using an access stratum key of the MTC device to the MTC device, so that the MTC device obtains the group key through decryption according to the access stratum key of the MTC device; and the MTC device configured to encrypt communications with the plurality of MTC devices belonging to the group using the group key, wherein the processor specifically is configured to; receive, from a mobility management entity MME, a service ID and a service root key corresponding to the service ID, wherein the service ID is a service ID of a service of the MTC device, which is sent to the MME by the MTC device, and the service root key is generated, according to a random number and a set key corresponding to the service ID, by an HSS to which the MTC device belongs, or the service root key is generated according to the random number, the service ID and an exclusive key of one MTC device by the HSS when the HSS receives the service ID from the one MTC device that is forwarded by the MME, and the HSS sends the service root key to the MME; and determine, according to the service ID, the group ID of the group to which the MTC device belongs; and generate the group communication root key corresponding to the group ID according to the service root key. - View Dependent Claims (7, 8, 9, 10)
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Specification