CN101056169B - Method and system for improving the multicast service security of the radio communication system - Google Patents
Method and system for improving the multicast service security of the radio communication system Download PDFInfo
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Abstract
The present invention relates to a method and system for improving the safety of the wireless communication system multi-cast service. The present invention mainly includes: the key material information for the multicast service is generated and transmitted by a key manager to the base station in the wireless communication system; the base station performs an encrypting process to the empty multicast service between the base station and the user terminal according to the received key material. In the present invention, the base station can obtain the required key material information for the empty service transmission in the wireless communication system such as WiMAX, thus, the safety of the empty service such as the safety of the position and the communication information of the user terminals can be ensured effectively.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a multicast key management technology.
Background
In a communication system, to ensure security during the process of developing a communication service, a corresponding key needs to be applied in service interaction information, for example, in a wireless communication system, a corresponding multicast key needs to be applied for a developed multicast service.
The management and application of the multicast key will be described below by taking the multicast service as an example.
In the process of developing multicast service, the multicast keys to be used are mainly classified into two types:
(1) directly protecting the data encryption key of the multicast service data;
(2) and protecting the data encryption key and distributing the data encryption key to the key encryption key of the data receiving end.
The two types of keys are commonly used in multicast services, wherein:
the data encryption key is directly used for encrypting and decrypting data, and since the key is usually distributed by using a broadcast channel and the storage mode for the data encryption key is easily known by a user of a terminal, the corresponding data encryption key needs to be updated relatively frequently in order to further ensure the safety of a communication process.
The key encryption key is usually distributed by using a unicast channel, and since data does not need to be directly encrypted by using the key encryption key, the key encryption key can be stored in a higher-security place, for example, a SIM (subscriber identity module) card, and the like.
In the existing wireless communication systems such as 3GPP and 3GPP2, the two types of keys are directly encrypted at the data higher-layer control point, so that the information exchanged between the terminal and the higher-layer control point can be correspondingly protected by using the two types of keys, so as to ensure the security of the exchanged information.
Since the existing wireless communication system only performs encryption operation at a high-level control point, the security of information exchanged between an access network and a terminal cannot be well guaranteed, for example, the security of contents such as session information and terminal location information exchanged over the air cannot be guaranteed.
Disclosure of Invention
The invention aims to provide a method and a system for improving the security of multicast service of a wireless communication system, thereby effectively ensuring the security of the interactive multicast service between a base station and a user terminal.
The purpose of the invention is realized by the following technical scheme:
the invention provides a method for improving the multicast service security of a wireless communication system, which comprises the following steps:
A. in the wireless communication system, a key manager sends generated key material information required by developing multicast services to a base station;
B. and after receiving the key material information, the base station encrypts the air interface multicast service interacted between the base station and the user terminal according to the key material.
The keying material comprises:
the system comprises an authorization key MAK and related parameters thereof, a multicast group communication encryption key MGTEK and related parameters thereof, a multicast key encryption key GKEK and related parameters thereof, a multicast group security suite MBSGSA and/or a multicast communication key MTK and related parameters thereof.
The MAK and related parameters thereof include: the MAK, the remaining life time of the MAK, and/or the MAK serial number.
The GKEK and related parameters thereof comprise: GKEK, GKEK serial number, GKEK identifier, GKEK remaining life time, cipher text-based multicast KEY update message authentication code KEY CMAC _ KEY _ G and/or cipher text-based multicast KEY update message authentication code packet serial number CMAC _ PN _ G.
The MGTEK and related parameters thereof comprise: MGTEK, MGTEK remaining life time and/or MGTEK sequence number.
The MBSGSA and related parameters thereof comprise: an identifier of the MBSGSA, a type of the MBSGSA, an encryption suite of the MBSGSA, a traffic type of the MBSGSA, a sequence number of a downlink packet sent out recorded by the base station, a sequence number of a downlink packet received recorded by the terminal, an old MGTEK parameter, and/or a new MGTEK parameter.
The step A comprises the following steps:
a1, generating key materials including MAK and related parameters thereof, MGTEK and related parameters thereof, GKEK and parameters thereof and MBSGSA by the key manager;
or,
a2, the key manager generates key material including MAK and its related parameters, MGTEK and its related parameters, GKEK and its parameters, MBSGSA and MTK and its related parameters.
In the present invention, when the step a1 is executed, the step B further includes:
after receiving the key material sent by the key manager, the base station generates the MTK and the related parameters thereof according to the key material, and uses the generated MTK and the related parameters thereof as the key material for air interface service transmission together with the received key material.
The method further comprises the following steps: an update operation to keying material generated by a key manager.
The method further comprises the following steps: the triggering of the renewal of the keying material may be performed before the expiration of the remaining lifetime of the key.
The invention also provides a system for improving the security performance of multicast service in a wireless communication system, which comprises:
a key material sending unit, which is arranged in a key manager of the wireless communication system and is used for sending the key material information which is generated by the key manager and is required by the multicast service development to a base station;
and the safety processing unit is arranged in a base station of the wireless communication system and used for encrypting the air interface multicast service interacted between the base station and the user terminal according to the received key material information.
The keying material comprises:
MAK and its related parameters, MGTEK and its related parameters, GKEK and its related parameters, MBSGSA and/or MTK and its related parameters.
In the present invention, when the key material generated by the key manager is a partial key material, the system further includes:
and the key information generating unit is arranged in a base station of the wireless communication system and used for generating the rest key materials included in the complete key materials according to the partial key materials received by the base station and providing the key materials to the security processing unit.
The key information generating unit includes:
and the MTK information generating unit is used for generating the MTK and the related parameter information according to the received partial key material and providing the MTK and the related parameter information to the security processing unit.
It can be seen from the above technical solutions that, in a wireless communication system such as WiMAX, the implementation of the present invention enables a base station to obtain information of each key material required for air interface service transmission, so as to effectively ensure the security of the air interface service, for example, the security of location information, session information, and the like of a user terminal. Therefore, the realization of the invention can effectively ensure the safety of the air interface multicast service in the wireless communication system.
Drawings
FIG. 1 is a first schematic flow chart of an embodiment of the method of the present invention;
FIG. 2 is a schematic diagram of a specific implementation flow of the method of the present invention
Fig. 3 is a schematic diagram of a specific implementation structure of the system according to the present invention.
Detailed Description
The core of the multicast key management method in the wireless network provided by the invention is that when the key material is initially generated and updated, the key manager generates the key material required by the multicast service, and the key manager sends the key material to the base station; thus, after receiving the key material, the base station can encrypt the multicast service with air interface interaction according to the key material. The key manager is an entity responsible for generation, distribution, update and maintenance of key material in the wireless communication system.
Taking a WiMAX network as an example, the key material includes at least one of the following:
(1) MAK (authorization Key) and related parameters
For use with an MGTEK (multicast group traffic encryption key) to generate an MTK (multicast traffic key) which is provided by an upper layer multicast service provider to a subscriber authorized for this service;
the method specifically comprises the following steps: the MAK, the remaining life time of the MAK and the MAK serial number;
(2) MGTEK and related parameters
The method is used for generating an MTK together with the MAK, and the MTK is provided by a network of an operator to a user or equipment authorized to access the network, and specifically comprises the following steps:
MGTEK, MGTEK remaining life time and MGTEK sequence number;
(3) GKEK (multicast Key encryption Key) and its parameters
The function of the GKEK is to provide protection for the MGTEK, encrypt it, and transmit it to the terminal, specifically including:
GKEK, GKEK serial number, GKEK identifier, GKEK remaining life time, CMAC _ KEY _ G (cipher text based multicast KEY update message authentication code KEY) and CMAC _ PN _ G (cipher text based multicast KEY update message authentication code packet serial number);
(4) MBSGSA (multicast group Security kit) and related parameters thereof
The key and data encryption for providing multicast for MBS (multicast service) in WiMAX network specifically includes:
an identifier of the MBSGSA, the type of the MBSGSA, an encryption suite of the MBSGSA, the service type of the MBSGSA, a sent downlink packet sequence number recorded by a base station, a received downlink packet sequence number recorded by a terminal, an old MGTEK parameter and a new MGTEK parameter;
(5) MTK and related parameters thereof
And the method is used for encrypting and transmitting the multicast data of the air interface.
In the invention, the processing procedure of initially generating and issuing the key material comprises the following two modes:
the first implementation mode is as follows:
firstly, a key manager generates key materials required by multicast services; the keying material generated at the key manager includes: the multicast service authorization key and related parameters thereof, the multicast service key encryption key and related parameters thereof, the multicast service communication encryption key and parameters thereof, and a security suite indicating an encryption algorithm and an encryption mode.
Thereafter, sending, by the key manager, the keying material to the base station; the keying material comprises: the multicast service authorization key and related parameters thereof, the multicast service key encryption key and related parameters thereof, the multicast service communication encryption key and parameters thereof, and a security suite indicating an encryption algorithm and an encryption mode.
Finally, after receiving the key material, the base station generates the rest key materials, such as the MTK and related parameters thereof, in the key material required for developing the multicast service according to the key material.
(II) the second realization mode is as follows:
that is, the corresponding processing procedure for initially generating and issuing the key material may also include:
firstly, a key manager generates key materials required by multicast services; the keying material generated at the key manager includes: the method comprises the steps that a multicast service authorization key and related parameters thereof, a multicast service key encryption key and related parameters thereof, a multicast service communication encryption key and parameters thereof, a security suite indicating an encryption algorithm and an encryption mode, and an MTK and related parameters thereof are set; i.e. all key material needed in the multicast service deployment process is generated in the key manager.
Thereafter, sending, by the key manager, keying material to the base station, the keying material comprising: the method comprises the steps that a multicast service key encryption key and related parameters thereof, a multicast service communication encryption key and parameters thereof, a security suite indicating an encryption algorithm and an encryption mode, and MTK and related parameters thereof are obtained; in this way, the base station can already obtain all key materials required for developing the multicast service, so that the generation of the key materials on the base station is not required, and the encryption processing can be performed on the air interface multicast service by directly utilizing the key materials sent by the key manager, thereby ensuring the security of the multicast service.
In the present invention, in order to ensure the reliability of the air interface multicast service encryption, the key material needs to be updated, and the trigger condition for the corresponding update may be triggered before the remaining life time of the key expires or under other set conditions.
The updating process of the key material is the same as the process of the initial generation material of the key material, namely, the key manager still generates the key material required by the multicast service and sends the key material to the base station, after the key material is received by the base station, the base station can update the original key material by using the corresponding key material, and can also generate other required key materials on the base station, such as MTK and related parameters thereof, and then update the corresponding key material information.
For the convenience of understanding of the present invention, a specific implementation manner of the present invention when applied to a WiMAX network will be described below with reference to the accompanying drawings.
Example one
In this embodiment, a corresponding process for initially generating the keying material is provided, and the MTK is generated in the key manager, as shown in fig. 1, specifically including:
step 11: the key manager generates key materials required by the multicast service;
the keying material comprises: MAK and its related parameters, MGTEK and its related parameters, GKEK and its parameters, MBSGSA and/or MTK and its related parameters, wherein:
the MAK and related parameters thereof include: MAK, remaining life time of MAK, MAK serial number;
the MGTEK and related parameters thereof comprise: MGTEK, MGTEK residual life time, MGTEK serial number;
the GKEK and related parameters thereof comprise: GKEK, GKEK serial number, GKEK identifier, GKEK remaining life time, CMAC _ KEY _ G and CMAC _ PN _ G;
the MBSGSA and related parameters thereof comprise: an identifier of the MBSGSA, the type of the MBSGSA, an encryption suite of the MBSGSA, the service type of the MBSGSA, a sent downlink packet sequence number recorded by a base station, a received downlink packet sequence number recorded by a terminal, an old MGTEK parameter and a new MGTEK parameter;
the MTK and related parameters thereof comprise: MTK generated by MGTEK and MAK together, residual life time of MTK, MTK serial number, encryption method and mode related initial vector and associated GKEK serial number;
step 12: the key manager sends the key material generated by the key manager to the base station;
wherein the keying material comprises: at least one of MGTEK and related parameters thereof, MGKEK and parameters thereof, MBSGSA and MTK and related parameters thereof;
thus, the base station can utilize the key material sent by the key manager to encrypt the air interface multicast service.
Example two
In this embodiment, the present invention provides a process for initially generating keying material, and the MTK is generated at the base station, as shown in fig. 2, specifically including:
step 21: the key manager generates key materials required by the multicast service;
the keying material comprises: MAK and its relevant parameter, MGTEK and its relevant parameter, GKEK and its parameter, MBSGSA and MTK and its relevant parameter;
for specific information contained in each keying material, refer to embodiment one, and detailed description is omitted here;
step 22: the key manager sends the key material to the base station;
wherein the keying material comprises: MGTEK and related parameters thereof, MAK and related parameters thereof, MGKEK and parameters thereof, and MBSGSA;
step 23: the base station receives the key material and generates MTK and related parameter information thereof according to the key material;
the method specifically comprises the following steps: generating corresponding MTK and related parameter information thereof according to the MGTEK and the MAK, wherein the MTK and the related parameter information comprise: MTK, residual life time of MTK, MTK serial number, encryption method and mode related initial vector and associated GKEK serial number;
in this way, although the key material generated by the key manager does not include the MTK and its related parameters, it can be generated at the base station, so that the base station can still obtain the complete key material required for developing the multicast service, so as to perform the encryption operation on the air interface multicast service.
The invention also provides a system for improving the security of multicast service in a wireless communication system, the specific implementation of the system is shown in fig. 3, and the system specifically comprises the following functional units:
(1) key material transmission unit
The unit is arranged in a key manager of a wireless communication system and used for sending key material information which is generated by the key manager and is required for developing multicast services to a base station, namely, each key material information required for air interface multicast encryption;
the key material comprises at least one of MAK and related parameters thereof, MGTEK and related parameters thereof, GKEK and related parameters thereof, MBSGSA and MTK and related parameters thereof.
(2) Secure processing unit
The unit is arranged in a base station of a wireless communication system and used for encrypting the air interface multicast service interacted between the base station and a user terminal according to the received key material information, namely encrypting the multicast service transmitted by the air interface by using the key material, thereby ensuring the transmission safety of the air interface multicast service.
It should be noted that the key material for developing multicast service may be completely generated by the key manager and sent to the base station, or a part of the key material may be generated by the key manager, and then the base station generates the rest of the key material according to the part of the key material sent by the key manager, so that the base station may obtain the complete key material;
when the keying material generated by the key manager is a part of the keying material, if the MTK and the related parameters are not included, the system further includes:
(3) key information generation unit
The unit is arranged in a base station of a wireless communication system and used for generating the rest key material information included in the complete key material according to the key material received by the base station in the base station and providing the key material information to the security processing unit, so that the security processing unit can obtain the complete key material, and the security of air interface information is ensured by using the complete key material;
for example, the key information generating unit may include an MTK information generating unit configured to generate an MTK and its related parameters that are not generated in the key manager, and provide the MTK and its related parameters to the secure processing unit.
In summary, in a wireless communication system such as WiMAX, a base station may obtain a key material required for air interface service transmission, so as to effectively ensure the security of the air interface service, for example, the security of the location information, session information, and the like of a user terminal.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (12)
1. A method for improving the security of multicast service in a wireless communication system is characterized by comprising the following steps:
A. in a wireless communication system, a key manager sends generated key material information required for developing multicast services to a base station, wherein the key material information comprises at least one of an authorization key MAK and related parameters thereof, a multicast group communication encryption key MGTEK and related parameters thereof, a multicast key encryption key GKEK and related parameters thereof, a multicast group security suite MBSGSA or a multicast communication key MTK and related parameters thereof;
B. after receiving the key material information, the base station encrypts the air interface multicast service interacted between the base station and the user terminal according to the key material;
wherein, the MAK represents that the user obtains the authorization of the corresponding MBS service, and is used for generating MTK together with the MGTEK; the MGTEK is used for obtaining the key when the terminal establishes the connection of the MBS service with the network and is used for generating the MTK together with the MAK; the GKEK is used for encrypting GTEK or MGTEK so as to ensure that the GKEK and the MGTEK are safely transmitted among devices; the MBSGSA comprises various safety information related to the MBS service; the MTK is used for encrypting the key transmitted by the MBS service in the air interface.
2. The method of claim 1, wherein the MAK and its associated parameters comprise: the MAK, the remaining life time of the MAK, and/or the MAK serial number.
3. The method of claim 1, wherein the GKEK and its related parameters comprise: GKEK, GKEK serial number, GKEK identifier, GKEK remaining life time, cipher text-based multicast KEY update message authentication code KEY CMAC _ KEY _ G and/or cipher text-based multicast KEY update message authentication code packet serial number CMAC _ PN _ G.
4. The method of claim 1 wherein the MGTEK and its associated parameters include: MGTEK, MGTEK remaining life time and/or MGTEK sequence number.
5. The method according to claim 1, wherein the MBSGSA and its associated parameters comprise: an identifier of the MBSGSA, a type of the MBSGSA, an encryption suite of the MBSGSA, a traffic type of the MBSGSA, a sequence number of a downlink packet sent out recorded by the base station, a sequence number of a downlink packet received recorded by the terminal, an old MGTEK parameter, and/or a new MGTEK parameter.
6. The method according to any one of claims 1 to 5, wherein step A comprises:
a1, the key manager generates key material including at least one of MAK and related parameters, MGTEK and related parameters, GKEK and parameters and MBSGSA;
or,
a2, the key manager generates keying material comprising at least one of MAK and its related parameters, MGTEK and its related parameters, GKEK and its parameters, MBSGSA and MTK and its related parameters.
7. The method of claim 6, wherein when performing step A1, step B further comprises:
after receiving the key material sent by the key manager, the base station generates the MTK and the related parameters thereof according to the key material, and uses the generated MTK and the related parameters thereof as the key material for air interface service transmission together with the received key material.
8. The method according to any one of claims 1 to 5, further comprising: an update operation to keying material generated by a key manager.
9. The method of claim 8, wherein the method comprises: the triggering of the renewal of the keying material is performed before the expiration of the remaining life time of the key.
10. An implementation system for improving security performance of a multicast service in a wireless communication system, comprising:
a key material sending unit, which is arranged in a key manager of the wireless communication system and is used for sending key material information generated by the key manager and required for developing multicast services to a base station, wherein the key material comprises at least one of an authorization key MAK and related parameters thereof, a multicast group communication encryption key MGTEK and related parameters thereof, a multicast key encryption key GKEK and related parameters thereof, a multicast group security suite MBSGSA or a multicast communication key MTK and related parameters thereof;
the safety processing unit is arranged in a base station of the wireless communication system and used for encrypting the air interface multicast service interacted between the base station and the user terminal according to the received key material information;
wherein, the MAK represents that the user obtains the authorization of the corresponding MBS service, and is used for generating MTK together with the MGTEK; the MGTEK is used for obtaining the key when the terminal establishes the connection of the MBS service with the network and is used for generating the MTK together with the MAK; the GKEK is used for encrypting GTEK or MGTEK so as to ensure that the GKEK and the MGTEK are safely transmitted among devices; the MBSGSA comprises various safety information related to the MBS service; the MTK is used for encrypting the key transmitted by the MBS service in the air interface.
11. The system of claim 10, wherein when the keying material generated by the key manager is partial keying material, the system further comprises:
and the key information generating unit is arranged in a base station of the wireless communication system and used for generating the rest key materials included in the complete key materials according to the partial key materials received by the base station and providing the key materials to the security processing unit.
12. The system according to claim 11, wherein the key information generating unit comprises:
and the MTK information generating unit is used for generating the MTK and the related parameter information according to the received partial key material and providing the MTK and the related parameter information to the security processing unit.
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| CN101415187B (en) * | 2007-10-19 | 2011-12-28 | 华为技术有限公司 | Method for implementing position business, method and apparatus for broadcasting base station geographic position information |
| CN101345677B (en) * | 2008-08-21 | 2011-06-01 | 西安西电捷通无线网络通信股份有限公司 | Method for improving security of broadcast or multicast system |
| CN102761830A (en) * | 2011-04-27 | 2012-10-31 | 华为终端有限公司 | Multicasting secret key updating and sending methods, access point device, terminal device and system |
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| CN1599326A (en) * | 2003-09-16 | 2005-03-23 | 华为技术有限公司 | Method for dynamic changing group information in group service |
| CN1625173A (en) * | 2003-12-05 | 2005-06-08 | 华为技术有限公司 | Optimization method of transmission control protocol in mobile communication system |
| CN1751533A (en) * | 2003-02-20 | 2006-03-22 | 西门子公司 | Method for creating and distributing cryptographic keys in a mobile radio system, and corresponding mobile radio system |
| CN1756149A (en) * | 2004-09-30 | 2006-04-05 | 株式会社日立制作所 | Cipher key updating method of dispersible environment and its system |
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| CN1751533A (en) * | 2003-02-20 | 2006-03-22 | 西门子公司 | Method for creating and distributing cryptographic keys in a mobile radio system, and corresponding mobile radio system |
| CN1599326A (en) * | 2003-09-16 | 2005-03-23 | 华为技术有限公司 | Method for dynamic changing group information in group service |
| CN1625173A (en) * | 2003-12-05 | 2005-06-08 | 华为技术有限公司 | Optimization method of transmission control protocol in mobile communication system |
| CN1756149A (en) * | 2004-09-30 | 2006-04-05 | 株式会社日立制作所 | Cipher key updating method of dispersible environment and its system |
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