CN102026185B - Method for examining validity of bill and network signaling node - Google Patents
Method for examining validity of bill and network signaling node Download PDFInfo
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- CN102026185B CN102026185B CN200910175579.4A CN200910175579A CN102026185B CN 102026185 B CN102026185 B CN 102026185B CN 200910175579 A CN200910175579 A CN 200910175579A CN 102026185 B CN102026185 B CN 102026185B
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Abstract
The present invention discloses a method examining validity of bill and a network signaling node. The method comprises the following steps of: the network signaling node receiving a bill from a sender, determining whether the bill is valid according to the local time of the network signaling node and the validity date of the bill, or examining the integrity of the bill according to the integrity of a main key obtained. The method solves the problem that a terminal user may use an overdue secret key by modifying the local time or the validity date of the bill, thereby effectively preventing the attackers using overdue bills.
Description
Technical field
The present invention relates to the communications field, in particular to validity check method and the network signal node of bill.
Background technology
At present, IP Multimedia System (IP Multimedia Core Network Subsystem, referred to as IMS) medium surface has adopted a kind of security mechanism based on key management system to realize the negotiation of media key end to end.
For the IMS medium surface security solution based on key management system, adopt after SNA schematic diagram networking as shown in Figure 1, based on key management system (KeyManage System, referred to as KMS) IMS media safety solution, the realization flow of setting up safe media channel between user A and user B comprises following processing (step S101-step S110):
Step S101: user A, user B adopt respectively common authentication mechanism (GeneralBootstrapping Architecture, referred to as GBA) mode to set up safely and be connected with KMS.
Here, GBA is a kind of security infrastructure based on mobile communications network, lightweight of 3GPP definition, can provide unified Security Authentication Service for application layer business.KMS, as a third party trusty, can realize management and the distribution function of key, and the position at KMS place can also adopt NAF.
Herein, if cannot adopt GBA mode, user can also use other authentication mechanisms and KMS foundation safety to be connected.
Step S102, user A send request to KMS, to apply for media key and bill.
Step S103, KMS generate media key and bill, and media key and bill are issued to user A.Media key is to be encrypted and transmitted by the shared key of user A and KMS, also comprises the information such as media key, the bill term of validity in bill.Wherein, the media key comprising in bill adopts the private cipher key of KMS to be encrypted, and the integrality of whole bill is also guaranteed by the private cipher key of KMS.
Step S104, user A are included in bill in the call request message (INVITE) that sends to user B.
The network element of step S105, IMS core net (Proxy Call Session Control Function (ProxyCall Session Control Function, referred to as P-CSCF) or service call conversation control function (Serving Call Session Control Function, referred to as S-CSCF) etc.) from user A, receive the INVITE that comprises bill, and be forwarded to user B.
, through the network element of authorizing, can send to KMS to obtain media key bill herein, for example, in subsequent step, user B obtains after bill, can submit a ticket and obtain media key to KMS.
Step S106, user B receive INVITE, get bill.
Step S107, user B send to KMS to obtain media key bill.
Step S108, KMS take out media key, and check the identity of user B.
Step S109, check and to pass through after, KMS is used private cipher key to decipher this bill and obtains media key, and by the shared key of KMS and user B, encrypts this media key and send to user B.
Step S110, user B successfully accept the call request of user A.
In above-mentioned steps, user A need to initiate bill application request to KMS, and user B receives after the bill from user A, need to, to the KMS analysis request that submits a ticket, therefore need larger signaling consumption.In order to address this problem, in correlation technique, the concept of reusable bill has been proposed.Bill can be used repeatedly within its lifetime, and the bill lifetime is defined as two times, and one is effective date and time, and one is expired date and time, and reusable bill is used the intervention that can not need KMS within the lifetime.Therefore, step S102, step S103, step S107, step S108, step S109 can omit.
Fig. 2 is the basic structure of bill; as shown in Figure 2; by the sign (TPK-ID) of the master key in this bill; navigate to the private cipher key TPK that only has KMS; TPK is by key derivative function (Key Derivation Funtion; referred to as KDF) derive Ke and Ka, Ke is used for encrypting the KEMAC load (namely media key) in bill, and Ka is used for the whole key of integrity protection.
Produce thus a problem, Ka provides integrity protection to whole bill, but Ka is owing to being that the private cipher key of KMS derives from, but when reusable bill is used, does not need the intervention of KMS.Therefore the attack that has brought two kinds of modes:
The first: do not revise ticket contents if terminal use does not possess ability, but can local zone time is in the bill term of validity by revising local zone time always, can reach the object of using pass due note.
The second: if terminal use possesses the ability of revising bill, terminal only need to be revised the term of validity of bill, can reach the object of using pass due note.
Summary of the invention
For terminal use in correlation technique, by revising the term of validity of local zone time or modification bill, to reach, use the problem of expired key object to propose the present invention, for this reason, main purpose of the present invention is to provide a kind of validity check method and network signal node of improved bill, one of to address the above problem at least.
A kind of validity check method of bill is provided according to an aspect of the present invention.
According to the validity check method of bill of the present invention, comprise: network signal node receives the bill that comes from transmit leg; Whether network signal node obtains the term of validity of bill, and effective according to the local zone time of network signal node and term of validity decides bill.
A kind of validity check method of bill is provided according to a further aspect in the invention.
According to the validity check method of bill of the present invention, comprise: network signal node receives the bill that comes from transmit leg; Network signal node obtains integrality master key, and according to integrality master key, bill is carried out to integrity check.
According to a further aspect of the invention, provide a kind of network signal node.
Network signal node according to the present invention comprises: receiving element, verification unit, and wherein, receiving element, for receiving the bill that comes from transmit leg; Whether verification unit, for comparing with decides bill effective by local zone time and the term of validity of obtaining from bill.
According to a further aspect of the invention, provide a kind of network signal node.
Network signal node according to the present invention comprises: receiving element, acquiring unit, verification unit, and wherein, receiving element, for receiving the bill that comes from transmit leg; Acquiring unit, for obtaining integrality master key; Verification unit, for carrying out integrity check according to integrality master key to bill.
By the present invention, network signal node obtains the term of validity of bill, and whether effective according to the local zone time of network signal node and term of validity decides bill, or, network signal node carries out integrity check according to integrality master key to bill, solved terminal use in correlation technique by the term of validity revising local zone time or revise bill to reach the problem of using expired key object, and then can effectively take precautions against the assailant who uses pass due note.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, or understand by implementing the present invention.Object of the present invention and other advantages can be realized and be obtained by specifically noted structure in the specification write, claims and accompanying drawing.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the network architecture diagram of the media safety based on bill in correlation technique;
Fig. 2 is the schematic diagram of the derivative strucure of the basic structure of bill and the key of protection bill;
Fig. 3 is according to the flow chart of the validity check method of the first bill of the embodiment of the present invention;
Fig. 4 is according to the flow chart of the validity check method of the second bill of the embodiment of the present invention;
Fig. 5 is according to the structural representation of the first network signal node of the embodiment of the present invention;
Fig. 6 is the structural representation of the first network signal node according to the preferred embodiment of the invention;
Fig. 7 is according to the structural representation of the second network signal node of the embodiment of the present invention;
Fig. 8 is the structural representation of the second network signal node according to the preferred embodiment of the invention.
Embodiment
Functional overview
Consider terminal use in correlation technique by the term of validity revising local zone time or revise bill to reach the problem of using expired key object, the embodiment of the present invention provides validity check method and the network signal node of two kinds of bills, when terminal use does not possess ability modification bill ability, network signal node only need to, with the local zone time of oneself and the term of validity comparison of bill, judge that whether this bill is expired.This scheme realizes simple, efficient, can tackle the assailant that ability is lower, but bill not done to integrity checking, the assailant that the ability that not can do with is higher;
When terminal use has the ability of distorting bill, KMS (for example sends to network signal node by bill Integrity Key, P-CSCF), thereby network signal node can carry out integrity checking to the bill receiving, thereby stop malicious user, by revising the term of validity of bill, realize use pass due note.Therefore meanwhile, from bill Integrity Key, cannot derive bill encryption key, guarantee that network signal node cannot understand in bill with the media master key of bill encryption keys, guarantee the safety end to end of both call sides.This mode can tackle the assailant that ability is higher.
It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
Embodiment of the method
According to the embodiment of the present invention, first provide a kind of validity check method of bill.
Fig. 3 is according to the flow chart of the validity check method of the first bill of the embodiment of the present invention.As shown in Figure 3, according to the validity check method of the first bill of the embodiment of the present invention, comprise following processing (step S301-step S303):
Step S301: network signal node receives the bill that comes from transmit leg;
Wherein, above-mentioned bill comprise following one of at least: reusable bill, non-reusable bill.That is, according to the validity check method of bill provided by the invention, be applicable to reusable bill to carry out validity check, be applicable to too non-reusable bill to carry out validity check.
Preferably, transmit leg will carry bill call request message and be sent to network signal node, and in order to guarantee partner safety end to end, network signal node need to be tested to the validity of bill.
Step S303: network signal node obtains the term of validity of bill, and whether effective according to the local zone time of network signal node and term of validity decides bill.
Preferably, network signal node obtains bill and comes into force phase and off period (being the term of validity) from bill, then by local zone time and the term of validity of signaling node, compares, and determines that whether this bill is effective.
Preferably, according to the local zone time of network signal node and term of validity decides bill whether effectively before, can also determine whether to carry out integrity check according to predefined preset strategy, if whether preset strategy is for not needing to carry out integrity check, effective according to the local zone time of network signal node and term of validity decides bill.
Preferably, according to the local zone time of network signal node and term of validity decides bill whether effectively after, if bill is effective, network signal node forwards the call request message that carries bill; Or, if invalid note, the call request of network signal node refusal transmit leg or the new bill of indication transmit leg application.
In specific implementation process, signaling node obtains bill and comes into force phase and off period from bill, then with the local zone time of signaling node, judge, whether bill is expired, if still before the deadline, signaling node continues to forward this message to network side, if out of date, signaling node answering call side, the call request of refusal transmit leg or the new bill of prompting transmit leg application.
According to the embodiment of the present invention, also provide a kind of validity check method of bill.
Fig. 4 is according to the flow chart of the validity check method of the second bill of the embodiment of the present invention.As shown in Figure 4, according to the validity check method of the second bill of the embodiment of the present invention, comprise following processing (step S401-step S403):
Step S401: network signal node receives the bill that comes from transmit leg;
Wherein, above-mentioned bill comprise following one of at least: reusable bill, non-reusable bill.That is, according to the validity check method of bill provided by the invention, be applicable to reusable bill to carry out validity check, be applicable to too non-reusable bill to carry out validity check.
Preferably, transmit leg will carry bill call request message and be sent to network signal node, and in order to guarantee partner safety end to end, network signal node need to be tested to the validity of bill.
Step S403: network signal node obtains integrality master key, and according to integrality master key, bill is carried out to integrity check.
Preferably, in step S403, network signal node obtains integrality master key and comprises following processing:
(1) network signal node obtains the identification information of master key from bill;
(2) network signal node is according to the corresponding relation of the identification information of pre-stored master key and integrality master key, obtain the integrality master key corresponding with the identification information of the master key carrying in bill, wherein, from integrality master key, cannot derive for generating the encryption main key of encryption key, and cannot derive integrality master key from encryption main key, can say, integrality master key and encryption main key are mutually completely independent.
Wherein, completely independent in order to realize Integrity Key and encryption key, TPK is divided into two complete independent encryption master keys (TPKe) and integrality master key (TPKa), by TPKa, cannot derive TPKe, and encryption key (Ke) and Integrity Key (Ka) all derive from from same master key (TPK), this TPK determines by TPK-ID, and therefore, network signal node cannot obtain in bill the media master key by the encryption keys of bill.
Preferably, the identification information of the master key that above-mentioned network signal node is pre-stored and the corresponding relation of integrality master key, sent in advance by key management system,, described network signal node receives the described corresponding relation that comes from key management system in advance, and stores.
Preferably, before bill being carried out to integrity check according to integrality master key, can also determine whether to carry out integrity check according to predefined preset strategy, if preset strategy be for need to carry out integrity check, whether effectively according to integrality master key, bill is carried out to integrity check decides bill.
Preferably, after bill is carried out to integrity check, whether network signal node can also compare with decides bill effective by the term of validity of local zone time and bill.
Preferably, after bill is carried out to integrity check, if bill is effective, network signal node forwards the call request message that carries bill; Or, if invalid note, the call request message of network signal node refusal transmit leg or the new bill of indication transmit leg application.
In specific implementation process, if preset strategy is for doing integrity check to bill, network signal node obtains TPK-ID from bill, in the correspondence table of local TPK-ID and TPKa, search for corresponding TPKa, if fail to search corresponding TPKa,, according to not needing the mode of doing end-to-end to process, if search corresponding TPKa, use TPKa to do integrity checking to the bill receiving.
After bill is done to integrity checking, specifically comprise following processing:
(1) if bill passes through integrity checking, network signal node obtains bill and comes into force phase and off period from bill, then according to the local zone time judgement of signaling node, whether bill is expired, if still before the deadline, signaling node continues to forward this message to network side, if out of date, signaling node is answering call side, the call request of refusal transmit leg or the new bill of prompting transmit leg application.
(2) if bill by integrity checking, network signal node answering call side, the call request of refusal transmit leg or the new bill of prompting transmit leg application.
According to the embodiment of the present invention, the validity check method of two kinds of bills is provided, solved terminal use in correlation technique by the term of validity revising local zone time or revise bill to reach the problem of using expired key object, and then can effectively take precautions against the assailant who uses pass due note.
Device embodiment
According to the embodiment of the present invention, also provide a kind of network signal node.
Fig. 5 is according to the structural representation of the first network signal node of the embodiment of the present invention.Fig. 6 is the structural representation of the first network signal node according to the preferred embodiment of the invention.As shown in Figure 5, according to the first network signal node of the embodiment of the present invention, comprise: receiving element 1, verification unit 2, be described below in conjunction with Fig. 6.
Receiving element 1, for receiving the bill that comes from transmit leg;
Verification unit 2, is connected with receiving element 1, for whether local zone time and the term of validity of obtaining from bill are compared with decides bill effective.
Wherein, above-mentioned bill comprise following one of at least: reusable bill, non-reusable bill.That is, according to network signal node provided by the invention, be applicable to reusable bill to carry out validity check, be applicable to too non-reusable bill to carry out validity check.
Preferably, as shown in Figure 6, network signal node can also comprise: judging unit 3, be connected with receiving element 1 with verification unit 2 respectively, for judging whether preset strategy is the strategy that need to carry out integrity check, when the determination result is NO, trigger verification unit.
Preferably, as shown in Figure 6, network signal node can also comprise: retransmission unit 4, processing unit 5.Wherein,
Retransmission unit 4, is connected with verification unit 2, for when bill is effective, forwards the call request message that carries bill;
Processing unit 5, is connected with verification unit 2, for when the invalid note, and the call request of refusal transmit leg or the new bill of indication transmit leg application.
According to the embodiment of the present invention, also provide a kind of network signal node.
Fig. 7 is according to the structural representation of the second network signal node of the embodiment of the present invention.Fig. 8 is the structural representation of the second network signal node according to the preferred embodiment of the invention.As shown in Figure 7, according to the second network signal node of the embodiment of the present invention, comprise: receiving element 6, acquiring unit 7, verification unit 8, be described below in conjunction with Fig. 8.
Receiving element 6, for receiving the bill that comes from transmit leg;
Acquiring unit 7, for obtaining integrality master key;
Verification unit 8, for carrying out integrity check according to integrality master key to bill.
Wherein, above-mentioned bill comprise following one of at least: reusable bill, non-reusable bill.That is, according to network signal node provided by the invention, be applicable to reusable bill to carry out validity check, be applicable to too non-reusable bill to carry out validity check.
Preferably, network signal node can also comprise: judging unit 9, be connected with verification unit 8 with acquiring unit 7 respectively, and for judging whether preset strategy is the strategy that need to carry out integrity check, judgment result is that while being, trigger verification unit 8.
Preferably, above-mentioned acquiring unit 7 can further include: acquisition module 70, search module 72, wherein, acquisition module 70, for obtaining the identification information of master key from bill; Search module 72, be connected with acquisition module 70, for the identification information of master key and the corresponding relation of integrality master key of preserving in this locality, search the integrality master key corresponding with master key identification information, wherein, from integrality master key, cannot derive for generating the encryption main key of encryption key, and cannot derive integrality master key from encryption main key.
Preferably, above-mentioned receiving element 6, also for receiving the above-mentioned corresponding relation that comes from key management system, wherein, this corresponding relation is the identification information of master key and the corresponding relation of integrality master key that network signal node above-mentioned is preserved in advance; Network signal node can also comprise: memory cell 12, the above-mentioned corresponding relation receiving for storing received unit.
Preferably, above-mentioned network signal node can also comprise: retransmission unit 10, processing unit 11, and wherein, retransmission unit 10, is connected to verification unit 8, for when bill is effective, forwards the call request message that carries bill; Processing unit 11, is connected to verification unit 8, for when the invalid note, and the call request of refusal transmit leg or the new bill of indication transmit leg application.
Preferably, above-mentioned network signal node includes but not limited to P-CSCF network element.
By above-described embodiment, two kinds of network signal nodes are provided, whether the first network signal node compares with decides bill effective by local zone time and the term of validity of obtaining from bill.The second network signal node carries out integrity check by the integrality master key getting to bill.After check, if bill, in the term of validity, forwards the call request message that carries bill, otherwise, the call request of refusal transmit leg or the new bill of indication transmit leg application.Thereby, can take precautions against the assailant who uses pass due note.
In sum, pass through the above embodiment of the present invention, the validity check method of the bill providing and network signal scheme of nodes, solved terminal use in correlation technique by the term of validity revising local zone time or revise bill to reach the problem of using expired key object, and then can effectively take precautions against the assailant who uses pass due note, improve the fail safe end to end of both call sides.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, or they are made into respectively to each integrated circuit modules, or a plurality of modules in them or step are made into single integrated circuit module to be realized.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. a validity check method for bill, is characterized in that, comprising:
Network signal node receives the bill that comes from transmit leg;
Described network signal node obtains the term of validity of described bill, determines and does not need to carry out integrity check, and judge that according to the local zone time of described network signal node and the described term of validity whether described bill is effective according to preset strategy.
2. method according to claim 1, is characterized in that,
Described bill comprise following one of at least: reusable bill, non-reusable bill.
3. according to the method described in any one in claim 1 to 2, it is characterized in that, according to the local zone time of described network signal node and the described term of validity, judge described bill whether effectively after, described method also comprises:
If described bill is effective, described network signal node forwards the call request message that carries described bill; Or
If described invalid note, described network signal node is refused the call request of described transmit leg or is indicated the new bill of described transmit leg application.
4. a network signal node, is characterized in that, comprising:
Receiving element, for receiving the bill that comes from transmit leg;
Judging unit, for judging whether preset strategy is the strategy that need to carry out integrity check, when the determination result is NO, triggers verification unit;
Described verification unit, for comparing to judge that by local zone time and the term of validity of obtaining from described bill whether described bill is effective.
5. network signal node according to claim 4, is characterized in that,
The bill that described receiving element receives comprise following one of at least: reusable bill, non-reusable bill.
6. according to the network signal node described in any one in claim 4 to 5, it is characterized in that, described network signal node also comprises:
Retransmission unit, for when described bill is effective, forwards the call request message that carries described bill;
Processing unit, for when the described invalid note, refuses the call request of described transmit leg or indicates the new bill of described transmit leg application.
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| CN200910175579.4A CN102026185B (en) | 2009-09-18 | 2009-09-18 | Method for examining validity of bill and network signaling node |
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| CN200910175579.4A CN102026185B (en) | 2009-09-18 | 2009-09-18 | Method for examining validity of bill and network signaling node |
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