CN106303584A - The audio, video data of transmission is carried out encipher-decipher method - Google Patents
The audio, video data of transmission is carried out encipher-decipher method Download PDFInfo
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- CN106303584A CN106303584A CN201610652231.XA CN201610652231A CN106303584A CN 106303584 A CN106303584 A CN 106303584A CN 201610652231 A CN201610652231 A CN 201610652231A CN 106303584 A CN106303584 A CN 106303584A
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- 238000000034 method Methods 0.000 title claims abstract description 57
- 230000005540 biological transmission Effects 0.000 title claims abstract description 56
- 238000005538 encapsulation Methods 0.000 claims description 13
- 101150055569 arc4 gene Proteins 0.000 claims description 11
- 239000003550 marker Substances 0.000 claims description 6
- 238000013507 mapping Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- 238000012544 monitoring process Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 241001269238 Data Species 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2389—Multiplex stream processing, e.g. multiplex stream encrypting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/242—Synchronization processes, e.g. processing of PCR [Program Clock References]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
- H04N21/4385—Multiplex stream processing, e.g. multiplex stream decrypting
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/835—Generation of protective data, e.g. certificates
- H04N21/8352—Generation of protective data, e.g. certificates involving content or source identification data, e.g. Unique Material Identifier [UMID]
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention discloses a kind of audio, video data to transmission and carry out encipher-decipher method, the audio, video data that will transmit is during being encapsulated as transmission stream (TS), carry out the audio, video data of different phase and relevant information all or part of repeatedly encrypting, be transmitted the most again；When receiving the TS of encryption in opposite end, the most correspondingly carry out TS all or part of repeatedly deciphering in different phase.So, the safety of transmission audio, video data by the safety effects of a set of AES, and would not increase cost.
Description
Technical field
The present invention relates to the audio frequency and video treatment technology to transmission, add particularly to a kind of audio, video data to transmission
Decryption method.
Background technology
Audio/video information, as a kind of resource, has very important showing in today of networking and information-based high speed development
Implementation use, with rapidly universal, the fast lifting of network performance of computer network and cloud computing and big data surging come
Attack, high-definition network audio-video monitoring just with its good technology and cost advantage, in safe city, smart city, intelligent transportation,
Or even the aspect such as enterprise, family or StoreFront, present flourish situation in full swing, disparate networks audio-video monitoring equipment
Emerge in an endless stream like the mushrooms after rain, during the construction of monitoring network audio and video system is carried out the most in high gear.Along with technology
Advancing, network safety event in recent years is the most increasingly severe, so in audio-video monitoring field, especially for low cost and more
Human-oriented cloud monitoring, a kind of effective audio-video encryption security system is particularly important.
At present, audio-video transmission system, particularly audio/video monitor and control system are generally basede on standard agreement exploitation, substantially without adding
Close say.For encryption, Encryption server or system at audio-video transmission system separately purchase hardware encryption, and safety improves
But cost with dispose that complexity is the most relative to be increased, and be not encrypted in source, itself has potential safety hazard.
Specifically, audio-video transmission system, when the audio frequency and video transmitted are carried out encryption and decryption, mainly uses two kinds of sides
Method: first method: use the key of solidification to be encrypted or use local random key the audio frequency and video of transmission, will encryption
After audio frequency and video pass to opposite end by cloud audio/video monitor and control system, opposite end use the key of solidification, or receive or pre-
The local random key first obtained according to rule is decrypted, but this mode exists security risk；Second method, at sound
Arranging special server or encryption device in Video transmission system, high and pure software the performance of cost is not enough, is not enough at frequency
Use under the embedded chip that rate is relatively low.
To sum up, audio-video transmission system simply applies mechanically some existing enciphering and deciphering algorithms, and security performance depends on that encryption is calculated
Method superior, does not take into full account the characteristic of audio frequency and video and the environment of transmission.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of method being encrypted the audio, video data of transmission, the method
Can be real-time encrypted to the audio, video data of transmission, in the case of not increasing cost, ensure safety.
The embodiment of the present invention also provides for a kind of method being decrypted the audio, video data of transmission, and the method can be to biography
Defeated audio, video data real time decrypting, ensures safety in the case of not increasing cost.
According to above-mentioned purpose, the present invention is achieved in that
A kind of method that the audio, video data of transmission is encrypted, including:
Parameter to video data carries out the encryption of AES encryption algorithm；
The video data carrying out AES encryption and voice data are transmitted flowing the encapsulation of TS；
TS is carried out the full data encryption of ARC4 AES；
Use the TS after transmission control protocol TCP mark encapsulation encryption, be transmitted.
Described video data is H264 data, and the parameter of described video data is sequence parameter set SPS and picture parameter set
PPS。
Before the described full data encryption that TS carries out ARC4 AES, the method also includes:
To TS end-of-packet 32 byte AES encryption.
Described to TS end-of-packet 32 byte AES encryption before, the method also includes:
TS key parameter is carried out AES encryption.
Described TS key parameter is:
In the transmission parameter packet header transport packet of TS, specifically include sync byte sync_byte, transmission mistake
Instruction transport_error_indication, load unit opening flag payload_unit_start, priority pass by mistake
Defeated mark transport_priority, bag mark PID, transmission control extension mark transport_scrambling_
Control, additional areas control mark adaptation_field_control and bag count-up counter cotinuity_
counter；
Or/and in Program Association Table field program_association_section of TS, specifically include table mark
Table_id, field sync instruction secton_syntax_indicator, reserve bytes reserved, field length
Section_length, transport stream identification transport_stream_id, version coding version_number, next stream
Mark current_next_indicator, code field section_number and last code field last_secton_
number；
Or/and in Program Map Table field TS_program_map_section of TS, specifically include table_id,
Section_syntax_indicator, reserved, ection_length, program coding program_number,
version_number、current_next_indicator、section_number、last_section_mumber、PCR
PID and programme information length program_info_length.
Described TS end-of-packet 32 byte AES encryption is included:
TS data end 32 byte that every 188 bags of I frame data are long is carried out AES128 encryption.
The described parameter to video data is encrypted, TS key parameter is carried out AES encryption, to TS end-of-packet 32 byte AES
Encrypt and TS is carried out ARC4 encryption and use four keys, be to be sent out to audio frequency and video by streaming media server by audio frequency and video receiving terminal
Sending end request audio, video data and by checking after, used the key arranged respectively by audio frequency and video transmitting terminal and audio frequency and video receiving terminal
Generating algorithm, based on calculated.
Described four keys obtain process and are:
Device identification, gap marker, time_t and clock_t are used 4 kinds of logical operations groups arranged, generates 4 kind 128
Figure place；
Ring shift left that 4 kind of 128 figure place is configured, map and replace, generating 4 group key groups, wherein, every group key
Group has 16 kind of 128 figure place；
Use random number, randomly select a key in each group, respectively to 4 kinds had cured at audio frequency and video receiving terminal
128 base datas carry out AES encryption, generate 4 kind of 128 figure place, as four keys.
A kind of method that the audio, video data of transmission is decrypted, including:
To the data stream received, use TCP mark to unseal, obtain the TS of encryption；
TS to encryption carries out the full data deciphering of ARC4 AES, obtains TS；
TS is unsealed, respectively obtains voice data and the video data having carried out AES encryption；
The voice data carrying out AES encryption is carried out the deciphering of AES encryption algorithm, obtains voice data.
Before TS is unsealed, also include:
TS end-of-packet 32 byte AES is deciphered.
Before TS is unsealed, also include:
TS key parameter is carried out AES deciphering.
As can be seen from the above scheme, the audio, video data that the present invention will be transmitted is being encapsulated as the process of transmission stream (TS)
In, carry out the audio, video data of different phase and relevant information all or part of repeatedly encrypting, be transmitted the most again；?
When opposite end receives the TS of encryption, the most correspondingly carry out TS all or part of repeatedly deciphering in different phase.So, transmission
The safety of audio, video data by the safety effects of a set of AES, and would not increase cost.
Accompanying drawing explanation
The method flow diagram that the audio frequency and video to transmission that Fig. 1 provides for the embodiment of the present invention are encrypted；
The form schematic diagram of the TS of the employing TCP mark encapsulation encryption that Fig. 2 provides for the embodiment of the present invention；
The method flow diagram that the audio frequency and video to transmission that Fig. 3 provides for the embodiment of the present invention are decrypted；
The method flow diagram of the audio-video transmission system transmission audio, video data that Fig. 4 provides for the embodiment of the present invention；
The network structure of the audio-video transmission system transmission audio frequency and video that Fig. 5 provides for the embodiment of the present invention；
The key generation method flow chart that Fig. 6 provides for the embodiment of the present invention.
Detailed description of the invention
For making the purpose of the present invention, technical scheme and advantage clearer, develop simultaneously embodiment referring to the drawings, right
The present invention is described in further detail.
The audio frequency and video to transmission that Fig. 1 provides for the embodiment of the present invention carry out real-time encrypted method flow diagram, and it is concrete
Step is:
Step 101, parameter to video data carry out the encryption of AES encryption algorithm；
In this step, video data is H264 data, and its parameter is sequence parameter set (SPS) and picture parameter set
(PPS)；
Step 102, the video data carrying out AES encryption and voice data are transmitted flow (TS) encapsulation；
In this step, voice data uses G711A form；
Step 103, TS is carried out the full data encryption of ARC4 AES；
TS after step 104, employing transmission control protocol (TCP) mark encapsulation encryption, is transmitted.
In the method, further, before step 103, the method also includes:
TS is closed bond number parameter and carries out AES encryption.
In the method, further, before step 103, after TS being closed bond number and carries out AES encryption, the method
Also include:
To TS end-of-packet 32 byte AES encryption.
In the method, it is considered to data need to transmit under complicated internet environment, TS possesses stronger opposing transmission
The ability of error code, and arbitrary fragment of the video flowing in TS starts independently to decode；It addition, voice data and video counts
According to carrying out composite package, it is also beneficial to carry out the synchronization of audio frequency and video at audio frequency and video receiving terminal, so by video data and audio frequency number
According to the TS composite package carrying out standard.
In the method, the key parameter that TS pass bond number parameter carries out AES encryption specifically includes that
In the transmission parameter packet header (transport packet) of TS, specifically include sync byte (sync_byte), pass
Input by mistake by mistake instruction (transport_error_indication), load unit opening flag (payload_unit_start),
Priority transmission mark (transport_priority), bag mark (PID), transmission control extension mark (transport_
Scrambling_control), additional areas controls mark (adaptation_field_control) and bag count-up counter
(cotinuity_counter)；
Or/and in the Program Association Table field (program_association_section ()) of TS, specifically include table
Mark (table_id), field sync instruction (secton_syntax_indicator), reserve bytes (reserved), field
Length (section_length), transport stream identification (transport_stream_id), version coding (version_
Number), next traffic identifier (current_next_indicator), code field (section_number) and last word
Section coding (last_secton_number)；
Or/in the Program Map Table field (TS_program_map_section) of TS, specifically include table_id,
Section_syntax_indicator, reserved, section_length, program coding (program_number),
version_number、current_next_indicator、section_number、last_section_mumber、PCR
PID and programme information length (program_info_length).
In the method, when to TS end-of-packet 32 byte AES encryption, also include:
TS data end 32 byte that every 188 bags of I frame data are long is carried out AES128 encryption.
In the method, the TS process after using TCP mark encapsulation to encrypt is:
In view of the network transmission environment of audio-video transmission system, web socket (socket) transmitting efficiency, switch
Characteristic, the TS characteristic of unpacking have passed through the packaging that the TS of encryption carries out 5 to 7 times of 188 to data.Mode is sent in view of TCP
Viscous bag and subpackage characteristic, encapsulation " TCP& " adds the encapsulation etching of data field length, carries as in figure 2 it is shown, Fig. 2 is the embodiment of the present invention
The form schematic diagram of TS of the employing TCP mark encapsulation encryption of confession, including tetra-bytes of TCP&, four bytes of data field length and
Data field.
In the method, the ciphering process described in Fig. 1 is performed by audio frequency and video transmitting terminal, and through streaming media server
It is transferred to audio frequency and video receiving terminal and is decrypted process.
Fig. 3 carries out the method flow diagram of real time decrypting for the audio frequency and video to transmission that the embodiment of the present invention provides, and it is concrete
Step is:
Step 301, the audio frequency and video receiving terminal data stream to receiving, uses TCP mark to unseal, obtains the TS of encryption；
Step 302, the full data deciphering that the TS encrypted is carried out ARC4 AES, obtain TS；
Step 303, TS is unsealed, respectively obtain voice data and the video data having carried out AES encryption；
Step 304, the voice data carrying out AES encryption is carried out the deciphering of AES encryption algorithm, obtain voice data.
So, just obtain audio frequency and video receiving terminal and carry out voice data and the video data of audio and video playing needs.
In the method, before TS is unsealed by step 303, the method also includes:
TS end-of-packet 32 byte AES is deciphered.
In the method, before TS is unsealed by step 303, the method also includes:
TS key parameter is carried out AES deciphering.
The method flow diagram of the audio-video transmission system transmission audio, video data that Fig. 4 provides for the embodiment of the present invention, in conjunction with
The network structure of the audio-video transmission system transmission audio frequency and video shown in Fig. 5, is described in detail, and it concretely comprises the following steps:
Step 401, audio frequency and video receiving terminal initiate audio frequency and video application request, this request Portable device mark to streaming media server
Know and gap marker；
In this step, audio frequency and video receiving terminal is exactly client, and streaming media server is exactly and audio frequency and video receiving terminal agreement
Server；
After step 402, this request of streaming media server receiving terminal, verifying, verification is by rear, to audio frequency and video transmitting terminal
Send audio frequency and video application request, carry gap marker, time_t time and clock_t time；
In this step, audio frequency and video application request also includes the second sum of series microsecond progression of streaming media server, Microsecond grade
Number prevents too high concurrently causing from repeating；
After step 403, audio frequency and video transmitting terminal receive this request, verifying, verification, by rear, with device identification, is led to
Road mark, time_t and clock_t are session identification, and the random number arranged, and use the key algorithm arranged to generate encryption sound
Key group needed for video data；
In this step, audio frequency and video transmitting terminal is encoding device；
In this step, random number is to choose one from 1～16；
Step 404, audio frequency and video transmitting terminal send and confirm that success message, in streaming media server, confirms that message is carried set
The random number put；
Step 405, streaming media server send and confirm that success message, to audio frequency and video receiving terminal, carries time_t and clock_
T and random number；
Step 406, audio frequency and video receiving terminal use the key schedule as audio frequency and video transmitting terminal, based on equipment mark
Key group needed for the generating random number deciphering audio, video data that knowledge, gap marker, time_t, clock_t and random number are arranged；
The TS of the encryption of TCP mark encapsulation is sent to sound by streaming media server and regards by step 407, audio frequency and video transmitting terminal
Frequently receiving terminal, completes the transmission of audio, video data.
The key generation method flow chart that Fig. 6 provides for the embodiment of the present invention, it concretely comprises the following steps:
Step 601, device identification, gap marker, time_t and clock_t are used 4 kinds of logical operations groups arranged, raw
Become 4 kind of 128 figure place；
Step 602, the ring shift left that 4 kind of 128 figure place is configured, map and replace, generating 4 group key groups, wherein,
Every group key group has 16 kind of 128 figure place；
Step 603, employing random number, randomly select a key in each group, respectively at audio frequency and video receiving terminal
4 kinds of 128 base datas of solidification carry out AES encryption, generate 4 kind of 128 figure place, as four keys.
In the present invention, four keys carry out SPS and the PPS encryption of video data, the encryption of TS key parameter, TS bag respectively
Terminate 32 byte encryption and the full data encryptions of ARC4.
It can be seen that the encipher-decipher method that the present invention provides is to combine the transmission of audio-video transmission system, H264 characteristic, TS
Encapsulation characteristic carries out selective local cypher and full ciphering process to data, and has the key of complete set to generate and management system
System, has taken into full account safety and the randomness of key, has been finally reached safety, high-performance, the biography of adaptation audio-video transmission system
Defeated, and audio frequency and video are prone to the advantages such as synchronization.
Here, audio-video transmission system can be internet system.
More than lift preferred embodiment, the object, technical solutions and advantages of the present invention are further described, institute
It should be understood that and the foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all the present invention's
Spirit and principle within, any amendment, equivalent and the improvement etc. made, should be included in protection scope of the present invention it
In.
Claims (10)
1. the method that the audio, video data of transmission is encrypted, it is characterised in that including:
Parameter to video data carries out the encryption of AES encryption algorithm；
The video data carrying out AES encryption and voice data are transmitted flowing the encapsulation of TS；
TS is carried out the full data encryption of ARC4 AES；
Use the TS after transmission control protocol TCP mark encapsulation encryption, be transmitted.
2. the method for claim 1, it is characterised in that described video data is H264 data, described video data
Parameter is sequence parameter set SPS and picture parameter set PPS.
3. the method for claim 1, it is characterised in that the described full data encryption that TS is carried out ARC4 AES it
Before, the method also includes:
To TS end-of-packet 32 byte AES encryption.
4. method as claimed in claim 3, it is characterised in that described to TS end-of-packet 32 byte AES encryption before, the method
Also include:
TS key parameter is carried out AES encryption.
5. method as claimed in claim 4, it is characterised in that described TS key parameter is:
In the transmission parameter packet header transport packet of TS, specifically include sync byte sync_byte, error of transmission refers to
Show transport_error_indication, load unit opening flag payload_unit_start, priority transmission mark
Will transport_priority, bag identify PID, transmission control extension identifies transport_scrambling_control,
Additional areas controls mark adaptation_field_control and bag count-up counter cotinuity_counter；
Or/and in Program Association Table field program_association_section of TS, specifically include table mark
Table_id, field sync instruction secton_syntax_indicator, reserve bytes reserved, field length
Section_length, transport stream identification transport_stream_id, version coding version_number, next stream
Mark current_next_indicator, code field section_number and last code field last_secton_
number；
Or/and in Program Map Table field TS_program_map_section of TS, specifically include table_id,
Section_syntax_indicator, reserved, ection_length, program coding program_number,
version_number、current_next_indicator、section_number、last_section_mumber、PCR
PID and programme information length program_info_length.
6. method as claimed in claim 3, it is characterised in that described TS end-of-packet 32 byte AES encryption is included:
TS data end 32 byte that every 188 bags of I frame data are long is carried out AES128 encryption.
7. method as claimed in claim 4, it is characterised in that the described parameter to video data is encrypted, to TS key parameter
Carry out AES encryption, to TS end-of-packet 32 byte AES encryption and TS is carried out ARC4 encryption use four keys, be by audio frequency and video
Receiving terminal by streaming media server to audio frequency and video transmitting terminal request audio, video data and by checking after, sent out by audio frequency and video respectively
Sending end and audio frequency and video receiving terminal use the key schedule arranged, based on calculated.
8. method as claimed in claim 7, it is characterised in that described four keys obtain process and are:
Device identification, gap marker, time_t and clock_t are used 4 kinds of logical operations groups arranged, generates 4 kinds 128
Number；
The ring shift left that is configured 4 kind of 128 figure place, mapping and replace, generating 4 group key groups, wherein, every group key group has
16 kind of 128 figure place；
Use random number, randomly select a key in each group, respectively to 4 kind 128 had cured at audio frequency and video receiving terminal
Position base data carries out AES encryption, generates 4 kind of 128 figure place, as four keys.
9. the method that the audio, video data of transmission is decrypted, it is characterised in that including:
To the data stream received, use TCP mark to unseal, obtain the TS of encryption；
TS to encryption carries out the full data deciphering of ARC4 AES, obtains TS；
TS is unsealed, respectively obtains voice data and the video data having carried out AES encryption；
The voice data carrying out AES encryption is carried out the deciphering of AES encryption algorithm, obtains voice data.
10. method as claimed in claim 9, it is characterised in that before TS is unsealed, also include:
TS end-of-packet 32 byte AES is deciphered；
Or/and before TS is unsealed, also include:
TS key parameter is carried out AES deciphering.
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Cited By (9)
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| CN108366296A (en) * | 2018-03-08 | 2018-08-03 | 四川泰立科技股份有限公司 | video encryption method and device |
| CN108769740A (en) * | 2018-06-05 | 2018-11-06 | 苏州科达科技股份有限公司 | Video data encrypted transmission method, system, equipment and storage medium |
| CN109743170A (en) * | 2018-11-30 | 2019-05-10 | 视联动力信息技术股份有限公司 | A kind of Streaming Media logs in and the method and apparatus of data transmission encryption |
| CN110035319A (en) * | 2019-04-02 | 2019-07-19 | 北京文香信息技术有限公司 | A kind of encryption and decryption method of audio, video data, device and playback equipment |
| CN110062206A (en) * | 2019-04-16 | 2019-07-26 | 阜阳师范学院 | A kind of video monitoring system resolves safely method and Video Monitor System |
| CN112188240A (en) * | 2020-09-30 | 2021-01-05 | 四川长虹电器股份有限公司 | Private transmission method of video data |
| CN112954673A (en) * | 2021-02-03 | 2021-06-11 | 深圳市长丰影像器材有限公司 | Encryption method for wireless microphone channel |
| CN115866299A (en) * | 2022-11-22 | 2023-03-28 | 航天信息股份有限公司 | Video tamper-proofing method and device, electronic equipment and storage medium |
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| CN110035319B (en) * | 2019-04-02 | 2020-05-15 | 北京文香信息技术有限公司 | Audio and video data encryption and decryption methods and devices and playing equipment |
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| CN112188240B (en) * | 2020-09-30 | 2022-04-05 | 四川长虹电器股份有限公司 | Private transmission method of video data |
| CN112954673A (en) * | 2021-02-03 | 2021-06-11 | 深圳市长丰影像器材有限公司 | Encryption method for wireless microphone channel |
| CN112954673B (en) * | 2021-02-03 | 2023-08-01 | 深圳市长丰影像器材有限公司 | Encryption method for wireless microphone channel |
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