CN101521818A - Encryption and decryption system based on medium security protection of IPTV platform - Google Patents
Encryption and decryption system based on medium security protection of IPTV platform Download PDFInfo
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- CN101521818A CN101521818A CN200910301427A CN200910301427A CN101521818A CN 101521818 A CN101521818 A CN 101521818A CN 200910301427 A CN200910301427 A CN 200910301427A CN 200910301427 A CN200910301427 A CN 200910301427A CN 101521818 A CN101521818 A CN 101521818A
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Abstract
The invention discloses an encryption and decryption system based on the medium security protection of an IPTV platform. On a platform end in the method, each sub-block of a media file is firstly carried out with MD5 operation, then a section of information is combined by the MD5 values obtained from the sub-blocks, the information is carried out with MD5 operation again, an obtained result is placed in a playlist, and finally, the playlist is encrypted. On a terminal, firstly, the playlist is decrypted, MD5 values of information abstracts of the media file, which are obtained from the playlist, are compared with the MD5 of information abstracts combined by all the sub-blocks of an operation file; if the two MD5 values are not identical, the play is prohibited; if the two MD5 values are identical, the MD5 of each sub-block is compared, if identical, the information is placed in a buffer area to by played; and if else, the play is stopped. The method has high speed and high safety factor.
Description
Technical field
The present invention relates to IPTV system medium technique, relate in particular to a kind of encrypting and deciphering system based on IPTV platform medium safety.
Background technology
At present, domestic IPTV media resource is to exist with the form of source file (unencryption) depositing of terminal.So long as the file that terminal can be supported so all can play out.Terminal comes the content of controls playing, the filename of appointment to come the index media file and play by playlist.Decision terminal plays content is only relevant with playlist, to media file itself without limits, so so long as the normal file of filename coupling can play back.If the file of terminal is done the Zhao of stealing the beams and changing the pillars file is replaced with file of the same name, so existing IPTV system is uncontrollable, is not precluded within the malicious sabotage, plays the situation of illegal contents.Simultaneously, playlist also is with form expressly depositing of terminal, and has live in our task and the multicast task, such task is only relevant with an address, by the streaming media server decision, if the address is distorted, the content of Bo Fanging will be uncontrollable to content so fully.Because the IPTV system adopts common network again, it is very big to be attacked and distort possibility, in case distorted, consequence is hardly imaginable.
At present, for the encryption of IPTV platform, mainly be to adopt symmetric encipherment algorithm to encrypt on commercial Application, mainly be to adopt DES.The des encryption method belongs to the symmetric cryptography system, it is lower that symmetric key algorithm has a computational complexity, advantages such as speed is fast, but the problem of symmetric encryption system maximum is generation, distribution and complex management, the cost height of key, and how on the net communicating pair cipher key shared safe transmission is a difficult problem.
Summary of the invention
Technical problem to be solved by this invention is: the deficiency at existing IPTV Play System platform proposes a kind of also safe fast medium safety encrypting and deciphering system.
The technical scheme that the present invention solves the problems of the technologies described above employing is: based on the adding of IPTV platform medium safety, decryption system, comprise following two parts:
1, the encryption of platform end
A. the platform end at first carries out piecemeal with media file according to piecemeal step-length (being RES) 512K, fills with 0 during not enough 512K, obtains media data information; Each media data information is carried out md5 encryption, obtain informative abstract; With each informative abstract and corresponding media data information, pack by structure shown in Figure 1 and to deposit, be about to that informative abstract is long, informative abstract and media data encapsulate and deposit, and promptly generates the playing media information source; Each informative abstract is obtained the media file informative abstract by generating to be linked in sequence successively, with playing media information parent name and media file informative abstract, add in the playlist as list element, idiographic flow is made of following steps as shown in Figure 3,
1) with media file according to desired big or small piecemeal, such as every of 512KByte, obtain a media data information;
2) each media data information is calculated its MD5 value, promptly obtain informative abstract;
3) with each informative abstract and corresponding media data information, to pack by structure shown in Figure 1 and to deposit, promptly successively that informative abstract is long, informative abstract and media data information packing are left in the file, promptly generate the playing media information source;
4) every informative abstract is deposited by genesis sequence obtained the media file informative abstract, playing media information parent name and media file informative abstract are added in the playlist as list element.
B. the platform end adopts DES to encrypt to the content of the playlist that generates in a), generates playlist and encrypts ciphertext; Then playlist is encrypted ciphertext and adopt md5 encryption to obtain MD5 value, encrypt generation playlist encryption MD5 ciphertext with the information of RSA private key after again md5 encryption; At last the private key of DES is encrypted with the RSA private key, generated DES private key ciphertext.DES private key ciphertext, playlist are encrypted ciphertext, playlist encryption MD5 ciphertext and the file structure of ciphertext length information data shown in Fig. 2 playlist ciphertext structure chart deposit, generate playlist and store ciphertext.
2, terminal deciphering
It at first is the playlist deciphering, comprise receive that from the platform termination playlist stores ciphertext after, resolve by file structure shown in Figure 2, obtain DES private key ciphertext, playlist encryption ciphertext, playlist encryption MD5 ciphertext and ciphertext length information, reduction obtains playlist then, specifically comprises the steps:
1) according to the RSA PKI to DES private key decrypt ciphertext, obtain the DES key;
2) according to the RSA PKI playlist is encrypted the MD5 decrypt ciphertext, obtain the MD5 value of playlist ciphertext;
3) the MD5 value of calculating playlist ciphertext;
4) more above-mentioned 2), 3) the MD5 value that obtains of two steps if two MD5 values are equal, proves that then playlist is not distorted, and enters the step 5) processing; Otherwise, inform that platform is distorted.
5) according to the DES key playlist is encrypted decrypt ciphertext, obtain playlist.
Be the checking of video file then, according to the playing media information parent name, obtain corresponding media file informative abstract from playlist, terminal is resolved according to Fig. 1 according to the media information source data that receives and is obtained informative abstract and media data information then; Verify at last.Idiographic flow comprises shown in the deciphering of Fig. 4 media resource:
1) order reads the informative abstract of 16 bytes from the media file informative abstract.
2) the media information source data that receives is pressed Fig. 1 structure elucidation, obtain informative abstract value and media information data.
3) compare 1), 2) two informative abstracts that go on foot, if different, then forbid playing; Identical, then media data is delivered to buffering area, wait broadcast.
Repeating step 1-3 when the media file informative abstract has been got, then stops.
In the IPTV of the present invention system, the method that adopts symmetric encipherment algorithm (being DES) and rivest, shamir, adelman (being RSA) to combine, each piece to media file does not carry out signature verification, after each piece carries out md5 encryption, again whole MD5 value is done a md5 encryption, the value that obtains is placed in the playlist.Then playlist is carried out symmetric cryptography.When the fail safe of media file was ensured by the fail safe of playlist, when having guaranteed the replacing key, the file in the media library did not need to do any variation.This cryptographic algorithm promptly has the advantage of fast encrypt, makes key be convenient to safety management again, makes the system safety coefficient increase greatly.
Description of drawings
The present invention is described in further detail below in conjunction with accompanying drawing.
Fig. 1 media file storage structure chart
Fig. 2 playlist ciphertext structure chart
Fig. 3 platform end block encryption flow chart
The deciphering flow chart of Fig. 4 media resource
Embodiment
Disclosed all features in this specification, or the step in disclosed all methods or the process except mutually exclusive feature and/or step, all can make up by any way.
Disclosed arbitrary feature in this specification (comprising any accessory claim, summary and accompanying drawing) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or the similar characteristics.
Fig. 1 is the media file storage structure chart, wherein media information length: the length of the whole data structure of presentation medium information, such as getting 4 bytes; Media data: source media file block of information, convenient for the client resolving information, the size of general information piece adopts fixed value, is 512K such as every block size.Informative abstract: the MD5 value that media data adopts md5 encryption to obtain is 16 bytes; The value of media information length is 4+512K+16Byte, and promptly the value of storing among 4 of media information length Byte is 4+512K+16.
Fig. 2 is a playlist ciphertext structure chart.Wherein bag is long: the data structure total length of expression playlist ciphertext structure, get 16 bytes; The ciphertext length information: expression ciphertext length information comprises that DES private key ciphertext is long, playlist is encrypted ciphertext long and playlist encryption MD5 ciphertext long three parts, totally 16 bytes.
DES private key ciphertext is long: expression DES private key ciphertext length, 4 bytes.
Playlist encryption ciphertext is long: the expression playlist is encrypted ciphertext length, 8 bytes.
Playlist encryption MD5 ciphertext is long: the expression playlist is encrypted MD5 ciphertext length, 4 bytes.
DES private key ciphertext: the information of DES private key behind the RSA encrypted private key.
Playlist is encrypted ciphertext: playlist information adopts the information behind the des encryption.
Playlist is encrypted the MD5 ciphertext: playlist is encrypted after ciphertext carries out md5 encryption, encrypts with the information of RSA private key after to md5 encryption again, generates playlist encryption MD5 ciphertext.
Playlist: be the data structure of the media file informative abstract of storage playing media parent name and correspondence, this structure comprises 2 column elements: media information parent name and media file informative abstract.
The present invention proposes a kind of encrypting and decrypting method of IPTV platform medium safety, the method that this method adopts symmetric encipherment algorithm and rivest, shamir, adelman to combine, and the fast and safety management of enciphering rate, and then improved the system safety coefficient.At first, encrypt, when playing, play by terminal deciphering at the platform end.
Wherein the platform end is encrypted and is comprised the steps:
A. the platform end at first carries out piecemeal with media file according to piecemeal step-length 512K, fills with 0 during not enough 512K, obtains media data information; Each media data information is carried out md5 encryption, obtain informative abstract; With each informative abstract and corresponding media data information, pack by structure shown in Figure 1 and to deposit, be about to that informative abstract is long, informative abstract and media data encapsulate and deposit, and promptly generates the playing media information source; Each informative abstract is obtained the media file informative abstract by generating to be linked in sequence successively, with playing media information parent name and media file informative abstract, add in the playlist as list element, idiographic flow is made of following steps as shown in Figure 3,
1) with media file according to desired big or small piecemeal, such as every of 512KByte, obtain a media data information;
2) each media data information is calculated its MD5 value, promptly obtain informative abstract;
3) with each informative abstract and corresponding media data information, to pack by structure shown in Figure 1 and to deposit, promptly successively that informative abstract is long, informative abstract and media data information packing are left in the file, promptly generate the playing media information source;
4) every informative abstract is deposited by genesis sequence obtained the media file informative abstract, playing media information parent name and media file informative abstract are added in the playlist as list element.
B. the platform end adopts DES to encrypt to the content of the playlist that generates in a), generates playlist and encrypts ciphertext; Then playlist is encrypted ciphertext and adopt md5 encryption to obtain MD5 value, encrypt generation playlist encryption MD5 ciphertext with the information of RSA private key after again md5 encryption; At last the private key of DES is encrypted with the RSA private key, generated DES private key ciphertext.DES private key ciphertext, playlist are encrypted ciphertext, playlist encryption MD5 ciphertext and the file structure of ciphertext length information data shown in Fig. 2 playlist ciphertext structure chart deposit, generate playlist and store ciphertext.
Wherein terminal deciphering comprises the steps:
It at first is the playlist deciphering, comprise receive that from the platform termination playlist stores ciphertext after, resolve by file structure shown in Figure 2, obtain DES private key ciphertext, playlist encryption ciphertext, playlist encryption MD5 ciphertext and ciphertext length information, reduction obtains playlist then, specifically comprises the steps:
1) according to the RSA PKI to DES private key decrypt ciphertext, obtain the DES key;
2) according to the RSA PKI playlist is encrypted the MD5 decrypt ciphertext, obtain the MD5 value of playlist ciphertext;
3) the MD5 value of calculating playlist ciphertext;
4) more above-mentioned 2), 3) the MD5 value that obtains of two steps if two MD5 values are equal, proves that then playlist is not distorted, and enters the step 5) processing; Otherwise, inform that platform is distorted.
5) according to the DES key playlist is encrypted decrypt ciphertext, obtain playlist.
Be the checking of video file then, according to the playing media information parent name, obtain corresponding media file informative abstract from playlist, terminal is resolved according to Fig. 1 according to the media information source data that receives and is obtained informative abstract and media data information then; Verify at last.Idiographic flow comprises shown in the deciphering of Fig. 4 media resource:
1) order reads the informative abstract of 16 bytes from the media file informative abstract.
2) the media information source data that receives is pressed Fig. 1 structure elucidation, obtain informative abstract value and media information data.
3) compare 1), 2) two informative abstracts that go on foot, if different, then forbid playing; Identical, then media data is delivered to buffering area, wait broadcast.
Repeating step 1)-3), when the media file informative abstract has been got, then stop.
In the IPTV of the present invention system, the method that adopts symmetric encipherment algorithm (being DES) and rivest, shamir, adelman (being RSA) to combine, each piece to media file does not carry out signature verification, after each piece carries out md5 encryption, again whole MD5 value is done a md5 encryption, the value that obtains is placed in the playlist.Then playlist is carried out symmetric cryptography.When the fail safe of media file was ensured by the fail safe of playlist, when having guaranteed the replacing key, the file in the media library did not need to do any variation.This cryptographic algorithm promptly has the advantage of fast encrypt, makes key be convenient to safety management again, makes the system safety coefficient increase greatly.
IPTV: IPTV is a kind of broadband cabled television network that utilizes, and integrates multiple technologies such as the Internet, multimedia, communication, and the brand-new technology of the multiple interactive services that comprises Digital Television is provided to the domestic consumer.
DES: data encryption standard, speed is very fast, is applicable to the occasion of encrypting mass data.
RSA (big integer factor decomposing system): the most famous, most widely used current public key cryptosyst is RSA.The advantage of RSA method is that principle is simple, is easy to use.Be that first can be used to encrypt the algorithm with digital signature simultaneously.
MD5 (Message Digest Algorithm 5): a kind of one-way Hash algorithm that is the exploitation of RSA data security company.
RES: the step-length of presentation medium fileinfo piecemeal.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
The above only is preferred embodiment of the present invention, not in order to restriction the utility model, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (13)
- [claim 1] a kind of encryption method based on IPTV platform medium safety, this method comprises the steps:The first step: the platform end at first carries out piecemeal with media file according to piecemeal step-length 512K, fills with 0 during not enough 512K, obtains media data information; Each media data information is carried out md5 encryption, obtain informative abstract; Each informative abstract and corresponding media data information packed deposit, and informative abstract is long, informative abstract and media data encapsulate and deposit, generate the playing media information source; Each informative abstract is obtained the media file informative abstract by generating to be linked in sequence successively,, add in the playlist as list element with playing media information parent name and media file informative abstract;Second step: the platform end adopts DES to encrypt to the content of playlist, generates playlist and encrypts ciphertext; Then playlist is encrypted ciphertext and adopt md5 encryption to obtain MD5 value, encrypt generation playlist encryption MD5 ciphertext with the information of RSA private key after again md5 encryption; At last the private key of DES is encrypted with the RSA private key, generated DES private key ciphertext; DES private key ciphertext, playlist are encrypted ciphertext, playlist encryption MD5 ciphertext and the packing of ciphertext length information deposit, generate playlist and store ciphertext.
- [claim 2] encryption method as claimed in claim 1 is characterized in that the described first step comprises the steps:Media file according to desired big or small piecemeal, is obtained a media data information;Each media data information is calculated its MD5 value, obtain informative abstract;Each informative abstract and corresponding media data information packed deposit, successively that informative abstract is long, informative abstract and media data information packing are left in the file, generate the playing media information source;Every informative abstract deposited by genesis sequence obtain the media file informative abstract, playing media information parent name and media file informative abstract are added in the playlist as list element.
- [claim 3] encryption method as claimed in claim 2 is characterized in that, described size is 512k.
- [claim 4] a kind of decryption method based on IPTV platform medium safety, this method comprises the steps:The first step: at first be playlist deciphering, comprise receive that from the platform termination playlist stores ciphertext after, resolve and obtain that DES private key ciphertext, playlist are encrypted ciphertext, playlist is encrypted MD5 ciphertext and ciphertext length information, reduction obtains playlist then;Second step: the checking of video file, according to the playing media information parent name, from playlist, obtain corresponding media file informative abstract, terminal is resolved according to the media information source data that receives and is obtained informative abstract and media data information then; Verify at last.
- [claim 5] decryption method as claimed in claim 4 is characterized in that, the described first step comprises:1. according to the RSA PKI to DES private key decrypt ciphertext, obtain the DES key;2. according to the RSA PKI playlist is encrypted the MD5 decrypt ciphertext, obtain the MD5 value of playlist ciphertext;3. calculate the MD5 value of playlist ciphertext;4. the 2. more above-mentioned and 3. MD5 value that obtains of two steps if two MD5 values are equal, proves that then playlist is not distorted, and enters step and 5. handles; Otherwise, inform that platform is distorted.5. according to the DES key playlist is encrypted decrypt ciphertext, obtain playlist.
- [claim 6] decryption method as claimed in claim 4 is characterized in that, described second step comprises:1. from the media file informative abstract, read the informative abstract of 16 bytes in proper order.2. the media information source data that receives is pressed Fig. 1 structure elucidation, obtain informative abstract value and media information data.3. if the more 2. and 3. informative abstracts in two steps different, then forbid playing; Identical, then media data is delivered to buffering area, wait broadcast.1.-3. repeating step when the media file informative abstract has been got, then stops.
- [claim 7] a kind of encrypting and decrypting system based on IPTV platform medium safety, this system comprises: the encryption of platform end and the deciphering of terminal.
- [claim 8] encrypting and decrypting system based on IPTV platform medium safety as claimed in claim 7 is characterized in that the encryption of described platform end comprises:The first step: the platform end at first carries out piecemeal with media file according to piecemeal step-length 512K, fills with 0 during not enough 512K, obtains media data information; Each media data information is carried out md5 encryption, obtain informative abstract; Each informative abstract and corresponding media data information packed deposit, and informative abstract is long, informative abstract and media data encapsulate and deposit, generate the playing media information source; Each informative abstract is obtained the media file informative abstract by generating to be linked in sequence successively,, add in the playlist as list element with playing media information parent name and media file informative abstract;Second step: the platform end adopts DES to encrypt to the content of playlist, generates playlist and encrypts ciphertext; Then playlist is encrypted ciphertext and adopt md5 encryption to obtain MD5 value, encrypt generation playlist encryption MD5 ciphertext with the information of RSA private key after again md5 encryption; At last the private key of DES is encrypted with the RSA private key, generated DES private key ciphertext; DES private key ciphertext, playlist are encrypted ciphertext, playlist encryption MD5 ciphertext and the packing of ciphertext length information deposit, generate playlist and store ciphertext.
- [claim 9] encrypting and decrypting system based on IPTV platform medium safety as claimed in claim 8,, it is characterized in that the described first step comprises the steps:Media file according to desired big or small piecemeal, is obtained a media data information;Each media data information is calculated its MD5 value, obtain informative abstract;Each informative abstract and corresponding media data information packed deposit, successively that informative abstract is long, informative abstract and media data information packing are left in the file, generate the playing media information source;Every informative abstract deposited by genesis sequence obtain the media file informative abstract, playing media information parent name and media file informative abstract are added in the playlist as list element.
- [claim 10] encrypting and decrypting system based on IPTV platform medium safety as claimed in claim 9 is characterized in that described size is 512k.
- [claim 11] encrypting and decrypting system based on IPTV platform medium safety as claimed in claim 7 is characterized in that the deciphering of described terminal comprises:The first step: at first be playlist deciphering, comprise receive that from the platform termination playlist stores ciphertext after, resolve and obtain that DES private key ciphertext, playlist are encrypted ciphertext, playlist is encrypted MD5 ciphertext and ciphertext length information, reduction obtains playlist then;Second step: the checking of video file, according to the playing media information parent name, from playlist, obtain corresponding media file informative abstract, terminal is resolved according to the media information source data that receives and is obtained informative abstract and media data information then; Verify at last.
- [claim 12] encrypting and decrypting system based on IPTV platform medium safety as claimed in claim 11,, it is characterized in that the described first step comprises:1. according to the RSA PKI to DES private key decrypt ciphertext, obtain the DES key;2. according to the RSA PKI playlist is encrypted the MD5 decrypt ciphertext, obtain the MD5 value of playlist ciphertext;3. calculate the MD5 value of playlist ciphertext;4. the 2. more above-mentioned and 3. MD5 value that obtains of two steps if two MD5 values are equal, proves that then playlist is not distorted, and enters step and 5. handles; Otherwise, inform that platform is distorted.5. according to the DES key playlist is encrypted decrypt ciphertext, obtain playlist.
- [claim 13] encrypting and decrypting system based on IPTV platform medium safety as claimed in claim 11 is characterized in that, described second step comprises:1. from the media file informative abstract, read the informative abstract of 16 bytes in proper order.2. the media information source data that receives is pressed Fig. 1 structure elucidation, obtain informative abstract value and media information data.3. if the more 2. and 3. informative abstracts in two steps different, then forbid playing; Identical, then media data is delivered to buffering area, wait broadcast.1.-3. repeating step when the media file informative abstract has been got, then stops.
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| CN101931784A (en) * | 2010-07-30 | 2010-12-29 | 康佳集团股份有限公司 | Method for encrypting and decrypting recorded program through HDCP key |
| CN102012846A (en) * | 2010-12-12 | 2011-04-13 | 成都东方盛行电子有限责任公司 | Integrity check method for large video file |
| CN102750516A (en) * | 2012-05-18 | 2012-10-24 | 西安邮电学院 | Certificate anti-counterfeit system with embedded biological characteristics and bar code technology |
| CN102855449A (en) * | 2012-09-18 | 2013-01-02 | 上海高越文化传媒股份有限公司 | Playing control safety control system |
| CN103098071A (en) * | 2010-09-21 | 2013-05-08 | 惠普发展公司，有限责任合伙企业 | Providing differential access to a digital document |
| CN104038468A (en) * | 2013-03-06 | 2014-09-10 | 中国移动通信集团公司 | File transmission method, file transmission system and file transmission device |
| CN104821944A (en) * | 2015-04-28 | 2015-08-05 | 广东小天才科技有限公司 | Hybrid encrypted network data security method and system |
| CN108966043A (en) * | 2018-08-08 | 2018-12-07 | 福州智永信息科技有限公司 | A kind of video consistent method for authenticating and system |
| CN109040783A (en) * | 2018-09-11 | 2018-12-18 | 北京朗达和顺科技有限公司 | A kind of video anti-counterfeiting system, method and device |
| CN110012317A (en) * | 2019-04-15 | 2019-07-12 | 北京乐学帮网络技术有限公司 | A kind of video acquiring method and device, a kind of video encryption method and device |
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| CN101931784A (en) * | 2010-07-30 | 2010-12-29 | 康佳集团股份有限公司 | Method for encrypting and decrypting recorded program through HDCP key |
| CN101931784B (en) * | 2010-07-30 | 2015-07-29 | 康佳集团股份有限公司 | By the method for HDCP double secret key encrypting and decrypting recorded program |
| CN103098071A (en) * | 2010-09-21 | 2013-05-08 | 惠普发展公司，有限责任合伙企业 | Providing differential access to a digital document |
| CN102012846A (en) * | 2010-12-12 | 2011-04-13 | 成都东方盛行电子有限责任公司 | Integrity check method for large video file |
| CN102750516B (en) * | 2012-05-18 | 2016-01-13 | 西安邮电大学 | A kind of certificate false proof system of embedded bio characteristic sum barcode technology |
| CN102750516A (en) * | 2012-05-18 | 2012-10-24 | 西安邮电学院 | Certificate anti-counterfeit system with embedded biological characteristics and bar code technology |
| CN102855449A (en) * | 2012-09-18 | 2013-01-02 | 上海高越文化传媒股份有限公司 | Playing control safety control system |
| CN102855449B (en) * | 2012-09-18 | 2016-01-20 | 上海基美文化传媒股份有限公司 | Broadcast Control safety control system |
| CN104038468A (en) * | 2013-03-06 | 2014-09-10 | 中国移动通信集团公司 | File transmission method, file transmission system and file transmission device |
| CN104038468B (en) * | 2013-03-06 | 2017-09-15 | 中国移动通信集团公司 | A kind of document transmission method, system and device |
| CN104821944A (en) * | 2015-04-28 | 2015-08-05 | 广东小天才科技有限公司 | Hybrid encrypted network data security method and system |
| CN108966043A (en) * | 2018-08-08 | 2018-12-07 | 福州智永信息科技有限公司 | A kind of video consistent method for authenticating and system |
| CN109040783A (en) * | 2018-09-11 | 2018-12-18 | 北京朗达和顺科技有限公司 | A kind of video anti-counterfeiting system, method and device |
| CN110012317A (en) * | 2019-04-15 | 2019-07-12 | 北京乐学帮网络技术有限公司 | A kind of video acquiring method and device, a kind of video encryption method and device |
| CN110222142A (en) * | 2019-05-09 | 2019-09-10 | 网宿科技股份有限公司 | A kind of topic distribution method and device |
| CN110222142B (en) * | 2019-05-09 | 2021-08-27 | 网宿科技股份有限公司 | Topic distribution method and device |
| CN110602570A (en) * | 2019-11-12 | 2019-12-20 | 成都索贝数码科技股份有限公司 | Video and audio credible playing method based on asymmetric encryption |
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