CN114070380A - Point-to-point secure data transmission method and device based on heaven-through facsimile channel - Google Patents
Point-to-point secure data transmission method and device based on heaven-through facsimile channel Download PDFInfo
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- CN114070380A CN114070380A CN202111312132.4A CN202111312132A CN114070380A CN 114070380 A CN114070380 A CN 114070380A CN 202111312132 A CN202111312132 A CN 202111312132A CN 114070380 A CN114070380 A CN 114070380A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18565—Arrangements for preventing unauthorised access or for providing user protection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/04—Protocols for data compression, e.g. ROHC
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/03—Protecting confidentiality, e.g. by encryption
Abstract
The invention relates to the technical field of satellite communication, in particular to a method and a device for point-to-point safe data transmission based on an Tiantong facsimile channel. The invention has the advantages that the user data can be safely transmitted through the fax channel under the condition of not knowing the target IP address, the data transmission rate is higher, the channel bandwidth is saved by the compression algorithm, and the data transmission safety is ensured by the encryption algorithm.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to a device for point-to-point safe transmission of user data by utilizing an all-weather fax channel.
Background
The first satellite 01 satellite of heaven through one based on the S frequency band successfully transmits in 2016 and 8 months, and at present, three satellites of heaven through one are all in orbit, support the lowest voice of 1.2Kbps, and the data service supports the service rate from 2.4Kbps to the highest 384Kbps, and can support the facsimile service of 9.6 Kbps. Various satellite communication services based on skynet one are actively being developed.
However, at present, the skynone number one data network and the mobile public network are not in networking intercommunication, the skynone number one IP resource is very nervous, and a user is difficult to apply for a server address of a fixed IP, so that the data service can only carry out point-to-point communication at present. The skynone first packet domain IP address considers that resources are limited and adopts a random distribution mode, a terminal does not have a fixed IP, even if point-to-point communication is used, a user can hardly know a target IP address of an opposite terminal, and particularly under the condition of unattended operation, the user can hardly carry out actual data transmission service.
Disclosure of Invention
In order to solve the above problems, the present invention provides a device for point-to-point secure data transmission based on an skyward facsimile channel, which specifically includes a plurality of skyward mobile communication devices, each of which serves as a facsimile channel provider of a user, and the users perform point-to-point data transmission based on the skyward facsimile channel.
The method for point-to-point data transmission between users based on the skynet fax channel, as shown in fig. 1, includes the following steps:
and S1, carrying out serialization compression on the user data, and saving the channel bandwidth. And reading 1024-byte data blocks from the data buffer each time, compressing the buffered data by adopting an LZ4 compression algorithm, and constructing a hash table with the size not larger than 16KB by adopting an xxHash algorithm in an LZ4 compression process.
And S2, encrypting the data information by adopting the ancestry sequence encryption algorithm to the compressed data.
And S3, establishing a fax channel, and transmitting the encrypted user data ciphertext according to a fax air control protocol.
3.1, the sending end dials to the receiving end to establish a normal conversation process. After the voice call is connected, the sending end simulates a facsimile calling single-tone CNG single-tone signal (frequency: 1100Hz) to send out, and the connection is carried out for 0.5s and the disconnection is carried out for 3 s; after receiving the CNG signal, the receiving end simulates the reply of a called terminal identification CED single tone signal (frequency: 2100Hz) and sends the signal once every 3.3 s.
3.2, the satellite mobile communication network receives the CED signal, negotiates and reaches the transmission protocol by sending a radio bearer Reconfiguration signaling to the sending end and the receiving end, selects a fax serial port to initiate channel switching by an AT command, and establishes a fax channel of the sending end and the receiving end;
and 3.3, constructing a fax air control protocol and transmitting the ciphertext data. After the fax channel is established and before data is sent, the receiving end sends an acceptable confirmation CFR control signaling to the sending end, and the sending end receives the CFR control signaling and starts to send a data ciphertext.
As shown in fig. 3, the fax over-the-air control protocol includes a protocol header, a message type, a user-user information protocol, and a protocol trailer, and the user-user information protocol includes a user-user information identifier, a user-user information length, a user-user protocol identifier, and a user-user information; wherein:
one byte of the protocol head is fixed to be 7E;
message type, fixed to 0x 04;
the user-user information identification is 0 xFF;
the user-user protocol identification 0xC8 denotes fax signaling;
the user-user information is used for bearing the fax control signaling of CFR, MPS, EOP, MCF, DCN and the like;
the protocol tail is fixed to 7E by one byte.
And S4, the data cipher text is sent to the receiving end through the fax serial port via the air interface, and the receiving end decrypts the received data into a data plaintext by adopting the ancestry rush sequence decryption algorithm.
And S5, the receiving end decompresses the decrypted data plaintext by adopting an LZ4 decompression algorithm to obtain the original data of the user.
And S6, after the data transmission of the sending end is finished, the sending end constructs a fax air control protocol DCN to indicate the end of the data transmission to the receiving end, and selects the control serial port to directly hang up through an AT command.
Compared with the prior art, the invention has the advantages that:
1) according to the invention, the LZ4 compression algorithm is adopted to compress the user data, so that the channel bandwidth is saved;
2) the invention adopts the ZUchong sequence encryption algorithm to encrypt the data information, thus ensuring the information transmission safety;
3) the invention adopts the fax channel to transmit the user data, achieves the purpose of transmitting the data without knowing the target IP address of the opposite terminal, simultaneously has the transmission rate far higher than the bandwidth of a voice channel, greatly improves the data transmission speed, and solves the problem that the data can not be automatically transmitted because the IP address of the opposite terminal can not be acquired when the heaven-earth satellite mobile network is unattended.
Drawings
FIG. 1 is a flow chart of a point-to-point data transmission according to the present invention;
FIG. 2 is a block diagram of an apparatus according to an embodiment of the present invention;
fig. 3 is a diagram of a fax over-the-air control protocol.
The specific implementation mode is as follows:
the following description will explain embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 2 shows a configuration of an apparatus according to an embodiment of the present invention, in which it is assumed that a user PC1 is a data sender, an skyward mobile communication apparatus a is a facsimile channel provider of a user PC1, a user PC2 is a data receiver, and a skyward mobile communication apparatus B is a facsimile channel provider of a user PC 2. The following briefly describes the fax data transmission process:
1) the user PC1 obtains the state of the skyward mobile communication device a through a serial port or a network port, and sends a data transmission command (including a destination number) to the skyward mobile communication device a when the skyward mobile communication device a is in service waiting.
2) And the skynman mobile communication device A receives the data transmission command, dials the target number, and initiates a voice call to the skynman mobile communication device B through the skynman satellite mobile communication network.
3) After receiving the voice call, the Tiantong mobile communication device B initiates automatic voice answering to the satellite mobile communication network, and at the moment, normal voice communication can be carried out between the two Tiantong mobile communication devices.
4) The skynting mobile communication device A simulates and sends a CNG signal to a called skynting mobile communication device B through a satellite mobile communication network; the skynt mobile communication device B replies to the satellite mobile communication network with an analog CED signal.
5) When the satellite mobile communication network detects the CED signal, respectively issuing a radio bearer Reconfiguration signaling to a skynman mobile communication device A and a skynman mobile communication device B; after receiving the signaling, the skynting mobile communication device a and the skynting mobile communication device B select the fax serial port to initiate channel switching by the AT command, switch to the fax service channel, reply the radio configuration Complete signaling, and establish the fax channels of the calling skynting mobile communication device a and the called skynting mobile communication device B.
6) According to the fax over-the-air control protocol, after the fax channel is established and before data transmission, the skynt mobile communication device B transmits CFR control signaling to the skynt mobile communication device a, and data transmission starts.
7) The skynet mobile communication apparatus a sends a data transmission preparation completion command to the user PC1 through the serial port or the internet port. The user PC1 starts sending data, and the skynet mobile communication device a reads 1024 bytes of data from the received data buffer each time, compresses the data using LZ4 compression algorithm, and sends the data to the data encryption module to encrypt the data information using the sequence encryption algorithm of zhushao.
8) And the skynman mobile communication device A reads the encrypted data ciphertext, sends the data ciphertext to the skynman communication module through the fax serial port, and sends the data ciphertext to the skynman mobile communication device B through the air interface.
9) The Tiantong mobile communication device B receives the data ciphertext transmitted by the Tiantong mobile communication device A by reading the fax serial port and transmits the data ciphertext to the data encryption and decryption module to decrypt the data information into the user data plaintext by adopting the ZUZhaoch sequence encryption algorithm.
10) And the skynet mobile communication device B decompresses the decrypted data plaintext by adopting an LZ4 decompression algorithm to obtain the original data of the user. The skynet mobile communication device B sends the skynet mobile communication device B to the user PC2 through a serial port or a network port;
11) and after the data of the user PC1 is completely transmitted, the user PC1 transmits a data transmission completion instruction to the skynet mobile communication device A, the skynet mobile communication device A transmits a DCN (data communication network) signaling to the skynet mobile communication device B according to a fax air control protocol to indicate that the data transmission is finished, and selects a control serial port to directly hang up through an AT (access terminal) command, so that the data transmission process is finished.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can understand that the modifications or substitutions within the technical scope of the present invention are included in the scope of the present invention, and therefore, the scope of the present invention should be subject to the protection scope of the claims.
Claims (6)
1. The device for point-to-point safe data transmission based on the heaven-earth communication fax channel is characterized by comprising a plurality of heaven-earth communication mobile communication devices, wherein each heaven-earth communication mobile communication device is used as a fax channel provider of a user, and the users perform point-to-point data transmission based on the heaven-earth communication fax channel;
the method for point-to-point data transmission between users based on the heaven-through fax channel comprises the following steps:
s1, carrying out serialization compression on the user data, and encrypting the compressed user data to obtain a user data ciphertext;
s2, establishing fax channel between sending end and receiving end, transmitting user data cipher text according to fax air control protocol;
s3, decrypting the data received by the receiving terminal to obtain a data plaintext;
s4, decompressing a data plaintext by the receiving end to obtain original user data;
and S5, after the data transmission of the sending end is finished, the sending end constructs a fax air control protocol DCN to indicate the end of the data transmission to the receiving end, and selects the control serial port to directly hang up through an AT command.
2. The apparatus for point-to-point secure data transmission based on skynet facsimile channel as claimed in claim 1, wherein the user data is compressed using LZ4 compression algorithm in S1, and a hash table of size no greater than 16KB is constructed using xxHash algorithm in LZ4 compression process.
3. The apparatus for point-to-point secure data transmission based on skynt facsimile channel as claimed in claim 1, wherein the encryption is performed by using the grand bust sequence encryption algorithm in S1.
4. The apparatus for point-to-point secure data transmission based on skynt facsimile channel as claimed in claim 1, wherein the transmission process in S2 is specifically:
2.1, the sending end dials to the receiving end, a normal conversation process is established, and after the conversation is connected, the sending end simulates sending of a fax calling single-tone CNG signal for 0.5s to be connected and 3s to be disconnected; after receiving the CNG signal, the receiving end simulates the CED single-tone signal reply of the called terminal identification and sends the signal reply once every 3.3 s;
2.2, the satellite mobile communication network of the day communication receives the CED single tone signal, issues radio bearer Reconfiguration signaling to the sending end and the receiving end to negotiate to reach a transmission protocol, selects a fax serial port to initiate channel switching through an AT command, and establishes a fax channel of the sending end and the receiving end;
2.3, constructing a fax air control protocol, transmitting an acceptable confirmation CFR control signaling to a transmitting end by a receiving end, and starting to transmit a user data ciphertext after receiving the CFR control signaling by the transmitting end; the fax air control protocol comprises a protocol head, a message type, a user-user information protocol and a protocol tail, wherein the user-user information protocol comprises a user-user information identifier, a user-user information length, a user-user protocol identifier and user-user information.
5. The apparatus for point-to-point secure data transmission based on skynt facsimile channel as claimed in claim 1, wherein the decoding is performed in S3 by using the grand rush sequence decryption algorithm.
6. The apparatus for point-to-point secure data transmission based on skynt facsimile channel as claimed in claim 1, wherein the decompression is performed using LZ4 decompression algorithm in S4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111312132.4A CN114070380A (en) | 2021-11-08 | 2021-11-08 | Point-to-point secure data transmission method and device based on heaven-through facsimile channel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111312132.4A CN114070380A (en) | 2021-11-08 | 2021-11-08 | Point-to-point secure data transmission method and device based on heaven-through facsimile channel |
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| CN114070380A true CN114070380A (en) | 2022-02-18 |
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| CN202111312132.4A Pending CN114070380A (en) | 2021-11-08 | 2021-11-08 | Point-to-point secure data transmission method and device based on heaven-through facsimile channel |
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Citations (6)
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| EP0835581B1 (en) * | 1995-06-30 | 2000-09-06 | Inmarsat Ltd. | Communication method and apparatus |
| US20060238821A1 (en) * | 2005-04-21 | 2006-10-26 | Viasat, Inc. | Method and apparatus for communication among facsimile machines over digitally compressed audio channels and discrimination of call type |
| CN103391387A (en) * | 2013-07-16 | 2013-11-13 | 合肥迈维电子科技有限公司 | Facsimile system based on Beidou information channel and facsimile data transmitting method |
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| CN112866263A (en) * | 2021-01-25 | 2021-05-28 | 中国航天标准化研究所 | File transmission system based on satellite network |
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2021
- 2021-11-08 CN CN202111312132.4A patent/CN114070380A/en active Pending
Patent Citations (6)
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| EP0835581B1 (en) * | 1995-06-30 | 2000-09-06 | Inmarsat Ltd. | Communication method and apparatus |
| US20060238821A1 (en) * | 2005-04-21 | 2006-10-26 | Viasat, Inc. | Method and apparatus for communication among facsimile machines over digitally compressed audio channels and discrimination of call type |
| CN103391387A (en) * | 2013-07-16 | 2013-11-13 | 合肥迈维电子科技有限公司 | Facsimile system based on Beidou information channel and facsimile data transmitting method |
| CN106788679A (en) * | 2016-12-21 | 2017-05-31 | 福建星海通信科技有限公司 | A kind of Beidou satellite communication device and method with speech identifying function |
| CN110572531A (en) * | 2019-09-19 | 2019-12-13 | 军事科学院系统工程研究院网络信息研究所 | Facsimile system and method based on satellite mobile communication |
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