CN105979513A - Decryption method and system for SGI of VoLTE network - Google Patents
Decryption method and system for SGI of VoLTE network Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/02—Protecting privacy or anonymity, e.g. protecting personally identifiable information [PII]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/04—Key management, e.g. using generic bootstrapping architecture [GBA]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/04—Arrangements for maintaining operational condition
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Abstract
The present invention is applicable to the field of signaling monitoring of communication networks, and provides a decryption method and a decryption system for an SGI of a VoLTE network. By means of the decryption method, the data of the SGI encrypted in an IPSec-ESP transmission mode can be analyzed, thereby greatly providing convenience for an operator to carry out statistics on the KPI of a network and viewing the call trace of a user when monitoring a network communication system, and being beneficial to network optimization and quick positioning of a failure or a problem.
Description
Technical field
The invention belongs to the monitoring signaling field of communication network, particularly relate to a kind of VoLTE network SGI interface
Decryption method and system.
Background technology
VoLTE (Voice over Long Term Evolution, audio frequency passes through LTE network transmission) is a kind of
IP data transmission technology, it is not necessary to 2G/3G net, whole service bearers on 4G network, can realize data with
Speech business unification under consolidated network.In other words, the data industry of two-forty is not only provided under 4G network
Business, also provides for high-quality voice and video telephone simultaneously, and the latter just needs VoLTE technology to realize.VoLTE
Technology brings 4G user and the most directly experiences that to be just to turn on the waiting time shorter, and more high-quality, more natural
Voice and video communication effect.VoLTE with 2G, 3G voice call are essentially different.VoLTE is
Framework end-to-end speech scheme under the conditions of full IP on 4G network.VoLTE compares 2G, 3G voice and leads to
Words, voice quality can improve about 40%, because it uses high-resolution encoding and decoding technique.VoLTE is for using
Lower access delay (waiting time after dialing) is brought at family, drops 50% than 3G, probably at about 2 seconds,
And the 2G epoch are in the 6-7 second.Additionally, the drop rate under 2G, 3G happens occasionally, but the drop rate of VoLTE
Close to zero.So, the system that a set of ruuning situation to communication network and equipment plays monitoring effect seems outstanding
It is important, and VoLTE monitoring system is the monitoring system that the development of monitoring field is the swiftest and the most violent at present.
VoLTE system is that the mode using IP mirror image or light splitting to gather obtains signaling number from signaling link
According to, then analytical data, synthesize detailed forms data record, add up detailed forms data record, generate miscellaneous service and refer to
Mark KPI (Key Performance Indicator, KPI Key Performance Indicator).So we can profound ground
Solve the ruuning situation of communication network, thus optimize network management, user's management, operational control and the rule of network
Draw design etc..The call signalling flow of VoLTE is from EPC (Evolved Packet Core, block core evolution)
Transparent transmission, accesses IMS network through Sgi interface, and therefore Sgi interface can be regarded as the first of signaling data
Initiating point and final receiving station, closest to user side, therefore the signalling analysis of Sgi interface represents user's the most
Business service condition.The signaling process of Sgi interface can not be parsed, it is impossible to meet people to communication network
Monitoring requirements.Accordingly, it would be desirable to the demand of Sgi portal contents deciphering is studied.
Summary of the invention
The technical problem to be solved is to provide the decryption method of a kind of VoLTE network SGI interface
And system, it is intended to solve the problem that the signaling of the SGI interface in existing VoLTE network cannot resolve.
The present invention is achieved in that the decryption method of a kind of VoLTE network SGI interface, including following step
Rapid:
Acquisition gateway gathers SGI interface, the signaling data of Mw, and is sent to SE-DD module；
Described signaling data is shunted by described SE-DD module according to shunting rule, connects being distributed to SGI
Mouth die block and Mw module；
Register in described Mw resume module SIP signaling and recovery process, obtain deciphering close
Key Key-nonce corresponding relation, and it is sent to key management module, described SGI interface modules handle SIP
Register in signaling and recovery process, obtain Spi-nonce corresponding relation, and be sent to described key
Management module；
Described key management module is according to the described decruption key Key-nonce corresponding relation got and described
Spi-nonce corresponding relation, sets up SPI-Key corresponding relation；
Described SGI interface module receives follow-up SIP signaling, and is sent to described key management module, root
The Key field returned according to the SPI-Key corresponding relation in described key management module, is carried out encrypted content
Deciphering.
Further, the signaling data of described SGI interface is the letter through IPSec-ESP encrypted transmission pattern
Make information.
Further, described signaling data is shunted, specifically by described SE-DD module according to shunting rule
For:
IP that described SE-DD module is pre-configured with according to SGI interface, Mw and port rule are by institute
State signaling data to shunt.
The present invention also provides for the decryption system of a kind of VoLTE network SGI interface, including:
Acquisition gateway, for gathering SGI interface, the signaling data of Mw and being transmitted；
SE-DD module, is used for receiving described signaling data, and according to shunting rule, by described signaling data
It is distributed to SGI interface module and Mw module；
Mw module, for processing the Register in SIP signaling and recovery process, obtains deciphering close
Key Key-nonce corresponding relation, and it is sent to key management module；
SGI interface module, processes the Register in SIP signaling and recovery process, obtains Spi-nonce
Corresponding relation, is sent to key management module；And receive follow-up SIP signaling and be sent to described key pipe
Reason module, the Key field returned according to the SPI-Key corresponding relation in described key management module, will add
Close content is decrypted；
Key management module, according to the described decruption key Key-nonce corresponding relation got and described
Spi-nonce corresponding relation, sets up SPI-Key corresponding relation, and returns Key according to the SIP signaling received
Field gives described SGI interface module.
Further, the signaling data of described SGI mouth is the signaling through IPSec-ESP encrypted transmission pattern
Information.
Further, described SE-DD module is pre-configured with according to SGI interface, Mw IP and end
Described signaling data is shunted by mouth rule.
The present invention compared with prior art, has the beneficial effects that: the solution of described VoLTE network SGI interface
Decryption method is by gathering signaling data, shunting, and is processed by the signaling data after shunting, obtains deciphering
Key Key-nonce corresponding relation and Spi-nonce corresponding relation, set up SPI-Key according to this corresponding relation
Corresponding relation so that key management module can return Key field to SGI interface after receiving SIP signaling
Encrypted content is decrypted by module.It is thus possible to by SGI interface by IPSec-ESP encrypted transmission pattern
Signaling be decrypted, to facilitate the Network Quality Analysis carrying out next step.This decryption method greatly facilitates
Operator's statistics network KPI index and check the calling vestige of user when monitoring network communicating system,
Be conducive to the quick location of the network optimization and fault or problem.
Accompanying drawing explanation
Fig. 1 is the flow chart of the decryption method of VoLTE network SGI interface of the present invention；
Fig. 2 is the basic system figure of the decryption method of VoLTE network SGI interface of the present invention；
Fig. 3 is the internal relations logic storage figure of key management module in Fig. 2；
Fig. 4 is the schematic diagram of the related keyword information of signaling data flow chart and decrypting process；
Fig. 5 is IPSec-ESP protocol stack and the schematic diagram of packet description.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and reality
Execute example, the present invention is further elaborated.Only should be appreciated that specific embodiment described herein
Only in order to explain the present invention, it is not intended to limit the present invention.
The decryption method of the VoLTE network SGI interface of the present invention can be connect by SGI interface and Mw
Mouth association, parses the official information encrypted by IPSec-ESP transmission mode in SGI interface.SGI
The application layer protocol that interface is corresponding with Mw is SIP (Session Initiation Protocol, conversation initial
Agreement), AES is the pattern of IPSec-ESP, ESP (Extended stack pointer, stack pointer)
For transmission mode.
Shown in Fig. 1 and Fig. 2, for the present invention one preferred embodiment, a kind of VoLTE network SGI connects
The decryption method of mouth, comprises the following steps:
Step 1, acquisition gateway 202 gather the signaling data 201 of SGI interface, Mw, and are sent to
SE-DD module 203.
Signaling data 201 is shunted by step 2, SE-DD module 203 according to shunting rule, and distributes
To SGI interface module 206 and Mw module 204.
The signaling data of SGI interface module 206 is the signaling information through IPSec-ESP encrypted transmission pattern.
Signaling data 201 is shunted by SE-DD module 203 according to shunting rule, particularly as follows: SE-DD
IP that module 203 is pre-configured with according to SGI interface, Mw and port rule are by signaling data 201
Shunt.
Step 3, Mw module 204 process the Register (registration) in SIP signaling and stream of reply
Journey, obtains decruption key Key-nonce corresponding relation, and is sent to key management module 205, SGI interface
Module 206 processes the Register in SIP signaling and recovery process, obtains Spi-nonce corresponding relation,
And it is sent to key management module 205.
What Mw module 204 processed the Register of Sip 401 replies message, and according in sip message
Holding and determine whether IPSec-ESP encryption instruction, if there being encryption instruction, then obtaining key, Nonce field,
And corresponding relation is sent to key management module 205.
SGI interface module 206 processes the Register of Sip and corresponding 401 message, now goes back unencryption.
The spi-c of UE can be parsed according to sip message content, spi-c, the spi-s of spi-s, PCSCF, and
Nonce, AES, encryption mode, cryptographic protocol, key.If cryptographic protocol is ESP, encryption mode
For transmission mode, then by the spi-c of UE, spi-c, spi-s, and the Nonce of spi-s, PCSCF, add
Close algorithm, key is sent to key management module 205.
Step 4, key management module 205 according to the decruption key Key-nonce corresponding relation got and
Spi-nonce corresponding relation, sets up SPI-Key corresponding relation.
The Mw that key management module 205 will receive, Sgi relevant information, associates according to Nonce, sets up
UE-SPI-C, UE-SPI-S, PCSCF-SPI-C, PCSCF-SPI-S, AES, key right
Should be related to.
Step 5, SGI interface module 206 receive follow-up SIP signaling, and are sent to key management module 205,
The Key field returned according to key management module 205, is decrypted encrypted content.
SGI interface module 206 is successfully received sip message, if the upper-layer protocol of IP is designated as SPI, then will
SPI is sent to key management module 205, and key management module 205 searches corresponding AES according to SPI
And key, return result to SGI interface.SGI interface module 206 according to the key received and algorithm,
Parse clear content, make subsequent treatment.
As in figure 2 it is shown, the decryption system of a kind of VoLTE network SGI interface, including: acquisition gateway 202,
SE-DD module 203, Mw module 204, SGI interface module 206 and key management module 205.
Acquisition gateway 202 is for gathering SGI mouth, the signaling data 201 of Mw mouth and being transmitted.
SE-DD module 203 is used for receiving signaling data 201, and carry out shunting according to shunting rule and incite somebody to action
Signaling data 201 after shunting is distributed to SGI interface module 206 and Mw module 204.
Mw module 204, for processing the Register in SIP signaling and recovery process, obtains deciphering
Key Key-nonce corresponding relation, and it is sent to key management module 205.
SGI interface module 206 processes the Register in SIP signaling and recovery process, obtains Spi-nonce
Corresponding relation, is sent to key management module 205, and receives follow-up SIP signaling and be sent to key management
Module 205, the Key field returned according to key management module 205, encrypted content is decrypted.
Key management module 205 is according to the decruption key Key-nonce corresponding relation got and Spi-nonce
Corresponding relation, sets up SPI-Key corresponding relation, and according to the SIP signaling received return Key field to
SGI interface module 206.
The signaling data of SGI mouth is the signaling information through IPSec-ESP encrypted transmission pattern.
IP and port rule that SE-DD module 203 is pre-configured with according to SGI interface, Mw will letters
Data 201 are made to shunt.
As it is shown on figure 3, be the internal relations logic storage figure of key management module 205.Wherein, Key represents
Key, ealg is AES, and Nonce is the authentication parameter of Sip Register message, SGI interface and Mw
Interface is by reaching to obtain the purpose of complete deciphering parameter alternately with key management module 205.
The internal relations of key management module 205 and and outside modules between mutual, specific as follows:
Step 101, key management module 205 receive the Nonce-Key correspondence of Mw module 204 and close
After system, inside modules is set up it and is hinted obliquely at relation table T1.
Step 102, key management module 205 receive the Nonce-< UE-SPI-C of SGI interface module 206,
UE-SPI-S, PCSCF-SPI-C, PCSCF-SPI-S, ealg > after corresponding relation, basis in T1 table
Nonce searches, and sets up<UE-SPI-S, PCSCF-SPI-S>-<Key, ealg>according to lookup result and maps pass
It is table T2, and deletes the Nonce corresponding content of T1.
Step 103, key management module 205 receive the request message of SGI, search Key, ealg according to SPI.
Wherein, according to the sending direction of original signaling, SGI interface module 206 may determine that SPI is belonging to UE-SPI-S
Or belong to PCSCF-SPI-S.
Key, the ealg that step 104, key management module 205 find according to SPI, returns to SGI and connects
Mouth die block 206, SGI, according to key, algorithm, can complete decryption work.
As shown in Figure 4, for signaling data flow chart and decrypting process related keyword information.This figure is mainly retouched
State the Signalling exchange between interface and main contents that signaling message carries.
Message (1), unencryption, Register up for UE asks message, carries Call-ID, SPI-C,
SPI-S, wherein Call-ID is for the internal correlation of SGI interface.
Message (2), unencryption, the Register message that PCSCF forwards, mainly carry Call-ID, be used for
The internal correlation of Mw.
Message (3), unencryption, carry Call-ID, Nonce, Key (key), Call-ID is used for
Mw internal correlation, Nonce is used for and SGI interface conjunctionn, and Key is used for deciphering.
Message (4), unencryption, carry Call-ID, Nonce, PCSCF-SPI-C, PCSCF-SPI-S,
Eagle (AES), Mod (encryption mode).Call-ID associates for SGI interface internal, Nonce
For associating with Mw, PCSCF-SPI-C, PCSCF-SPI-S, eagle are used for deciphering, and Mod sentences
Disconnected encryption mode.
Wherein, belong to the encrypted negotiation stage according to message (1), (2), (3), (4), all do not add
Close.Complete deciphering parameter can be set up.
Message (5), message (6) are postorder signaling message, encrypted content.Wherein message (5) is carried
SPI is UE-SPI-S, and the SPI that message (6) is carried is PCSCF-SPI-S.
As it is shown in figure 5, be the description of IPSec-ESP protocol stack and packet, transport on IPv4/IPv6
For the transmission mode application of row, ESP head is after IP head.The protocol fields of IP head is copied to
In " next head " field of ESP head, remaining field of ESP head is then filled, padding sequence field
Be the next value in sequence.Filling data can be inserted into, its value is allocated.That distributes also fills out simultaneously
Fill length value.What the protocol fields of IP head obtained is the value of ESP subsequently.
The decryption method of described VoLTE network SGI interface and decryption system by gather signaling data 201,
Shunting, and the signaling data 201 after shunting is processed, obtain decruption key Key-nonce corresponding relation
With Spi-nonce corresponding relation, set up SPI-Key corresponding relation according to this corresponding relation so that key management
Module 205 can return Key field to SGI interface module 206 by encrypted content after receiving SIP signaling
It is decrypted.It is thus possible to SGI interface is decrypted by the signaling of IPSec-ESP encrypted transmission pattern,
To facilitate the Network Quality Analysis carrying out next step.This decryption method greatly facilitates operator in monitoring net
Statistics network KPI index and check the calling vestige of user during network communication system, the beneficially network optimization with
And fault or the quick of problem position.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all at this
Any amendment, equivalent and the improvement etc. made within bright spirit and principle, should be included in the present invention
Protection domain within.
Claims (6)
1. the decryption method of a VoLTE network SGI interface, it is characterised in that comprise the following steps:
Acquisition gateway gathers SGI interface, the signaling data of Mw, and is sent to SE-DD module；
Described signaling data is shunted by described SE-DD module according to shunting rule, connects being distributed to SGI
Mouth die block and Mw module；
Register in described Mw resume module SIP signaling and recovery process, obtain deciphering close
Key Key-nonce corresponding relation, and it is sent to key management module, described SGI interface modules handle SIP
Register in signaling and recovery process, obtain Spi-nonce corresponding relation, and be sent to described key
Management module；
Described key management module is according to the described decruption key Key-nonce corresponding relation got and described
Spi-nonce corresponding relation, sets up SPI-Key corresponding relation；
Described SGI interface module receives follow-up SIP signaling, and is sent to described key management module, root
The Key field returned according to the SPI-Key corresponding relation in described key management module, is carried out encrypted content
Deciphering.
Decryption method the most according to claim 1, it is characterised in that the signaling number of described SGI interface
According to for the signaling information through IPSec-ESP encrypted transmission pattern.
Decryption method the most according to claim 1, it is characterised in that described SE-DD module is by institute
State signaling data to shunt according to shunting rule, particularly as follows:
IP that described SE-DD module is pre-configured with according to SGI interface, Mw and port rule are by institute
State signaling data to shunt.
4. the decryption system of a VoLTE network SGI interface, it is characterised in that including:
Acquisition gateway, for gathering SGI interface, the signaling data of Mw and being transmitted；
SE-DD module, is used for receiving described signaling data, and according to shunting rule, by described signaling data
It is distributed to SGI interface module and Mw module；
Mw module, for processing the Register in SIP signaling and recovery process, obtains deciphering close
Key Key-nonce corresponding relation, and it is sent to key management module；
SGI interface module, processes the Register in SIP signaling and recovery process, obtains Spi-nonce
Corresponding relation, is sent to key management module；And receive follow-up SIP signaling and be sent to described key pipe
Reason module, the Key field returned according to the SPI-Key corresponding relation in described key management module, will add
Close content is decrypted；
Key management module, according to the described decruption key Key-nonce corresponding relation got and described
Spi-nonce corresponding relation, sets up SPI-Key corresponding relation, and returns Key according to the SIP signaling received
Field gives described SGI interface module.
Decryption system the most according to claim 4, it is characterised in that the signaling data of described SGI mouth
For the signaling information through IPSec-ESP encrypted transmission pattern.
Decryption system the most according to claim 4, it is characterised in that described SE-DD module according to
Described signaling data is shunted by IP and port rule that SGI interface, Mw are pre-configured with.
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| CN108243057A (en) * | 2016-12-27 | 2018-07-03 | 中国移动通信集团浙江有限公司 | A kind of VoLTE conversion ratios analysis method and system |
| CN109120572A (en) * | 2017-06-22 | 2019-01-01 | 中兴通讯股份有限公司 | SIP signaling decryption method, device, system and computer readable storage medium |
| CN109714293A (en) * | 2017-10-25 | 2019-05-03 | 中国移动通信有限公司研究院 | VoLTE data traffic filter method, device, gateway, equipment and medium |
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| CN109120572A (en) * | 2017-06-22 | 2019-01-01 | 中兴通讯股份有限公司 | SIP signaling decryption method, device, system and computer readable storage medium |
| CN109714293A (en) * | 2017-10-25 | 2019-05-03 | 中国移动通信有限公司研究院 | VoLTE data traffic filter method, device, gateway, equipment and medium |
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Address after: 401120 No.2, 7th floor, Fenghuang a building, No.18, Qingfeng North Road, Yubei District, Chongqing Patentee after: Broid Technology Co.,Ltd. Address before: 518057 No.1, area a, 3 / F, B1 building, Gaoxin South 7th road digital technology park, Nanshan District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN BROADTECH Co.,Ltd. |