CN100484232C - Digital TV broadcast system and method - Google Patents
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- CN100484232C CN100484232C CN 200510074886 CN200510074886A CN100484232C CN 100484232 C CN100484232 C CN 100484232C CN 200510074886 CN200510074886 CN 200510074886 CN 200510074886 A CN200510074886 A CN 200510074886A CN 100484232 C CN100484232 C CN 100484232C
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Abstract
The digital TV broadcast system comprises: a TV program providing subsystem, a TV signal broadcast system, a network transmitting subsystem and a terminal play subsystem. Further, it can comprise a digital license authorizing subsystem used for providing the digital license for the TV program providing subsystem. Wherein the TV program providing subsystem further comprises a TV program digital signature device used for making digital signature for the video steam of TV program, and then adds the digital signature and digital license into the video stream transmitted in the network transmitting subsystem; the terminal play subsystem further comprises a security certification device used for examining validity of the digital license in the video stream according to its upper level certificates, and deciding if the video stream will be played or be rejected.
Description
Technical field
The present invention relates to digital television techniques, be specifically related to a kind of digital television broadcasting system and method.
Background technology
Along with science and technology development, digital television techniques arises at the historic moment.Because digital television techniques has advantages such as transmission quality height, scope is wide, the user is many, speed is fast, will replace traditional simulated television gradually, thereby has boundless market prospects.
Fig. 1 shows the basic structure of existing digital television broadcasting system.As can be seen from Figure 1, a digital television broadcasting system 100 comprises that TV programme provides subsystem 101, TV signal broadcast subsystem 102, network transmit subsystem 103 and terminal plays subsystem 104.Wherein television programming provider provides subsystem 101 to provide the digital television program video flowing to TV signal broadcast subsystem 102 by TV programme; Network transmit subsystem 103 will be provided by the video flowing that TV programme provides subsystem 101 to provide TV signal broadcast subsystem 102; The video flowing that network transmit subsystem 103 will be received from TV signal broadcast subsystem 102 is sent to terminal plays subsystem 104 by wired or satellite transmits mode; Terminal plays subsystem 104, but the digital television in the user family or have the simulated television of the set-top box of receiving digital signals just, then receive the video flowing of automatic network transmit subsystem 103, and play, thereby the digital television program that makes the user can watch television programming provider to provide by the mode that video shows.
Above-mentioned digital television broadcasting system is as a kind of new application model, and its fail safe also has the new characteristics that are different from simulated television.Specifically, present digital television broadcasting system mainly faces following safety problem:
(1) how realization condition receives, and just has only the paying customer to receive, and non-paying customer then can not receive;
(2) how to realize copyright protection, thereby guarantee the interests of television programming provider effectively;
(3) how to prevent that television programming provider from broadcasting illegal TV programme signal, for example broadcast laws such as relating to undue violence and forbid the content broadcasted;
(4) how to prevent that unauthorized person from transmitting the illegal TV programme of network insertion by controlling wired or satellite etc.
In order to solve first and second problems; require digital television broadcasting system to have confidentiality; just protect the fail safe of digital television signal; the person deciphers information encrypted to prevent not have the key; guarantee to have only the paying customer just can watch digital television program like this, but not the paying customer can not watch then.Simultaneously,, also guaranteed the copyright of digital television program conscientiously, and thereby guaranteed the interests of television programming provider because other user except the paying customer can not arbitrarily watch.
In the prior art, first and second problems have obtained solution to a certain extent, but third and fourth problem but never has practical solution, thereby have reduced the fail safe of whole digital television broadcasting system.
Summary of the invention
In view of this, the present invention is devoted to provide a kind of have the very digital television broadcasting system and the digital television broadcasting method of high security, to prevent that effectively television programming provider from broadcasting illegal TV programme signal and preventing that unauthorized person from transmitting the illegal TV programme of network insertion by controlling wired or satellite etc.
Above-mentioned purpose of the present invention is achieved by the following technical solutions:
A kind of digital television broadcasting system comprises:
TV programme provides subsystem, is used to provide the digital television program video flowing;
The TV signal broadcast subsystem is used for the video flowing that TV programme provides subsystem to provide is sent to the network transmit subsystem;
The network transmit subsystem, the video flowing that is used for being received from the TV signal broadcast subsystem is sent to the terminal plays subsystem;
The terminal plays subsystem is used to play the video flowing that is received from the network transmit subsystem,
Wherein this digital television broadcasting system comprises that further the digital permission certificate issues subsystem, is used for providing subsystem to issue the digital permission certificate to TV programme;
TV programme provides subsystem further to comprise the TV programme digital signature device, is used for television program video is flow to the line number word signature, and digital signature result and digital permission certificate are added to sends in the video flowing of network transmit subsystem then;
The terminal plays subsystem further comprises and self stores the safety certification device of higher level's certificate that the digital permission certificate of subsystem is provided corresponding to program, whether be used for the digital permission certificate that superposes according to this higher level's certification authentication video flowing legal, and whether the digital signature result of checking video flowing is correct, only under situation by described two judgements, the terminal plays subsystem is play this video flowing, otherwise abandons this video flowing.
It is mutually different to the digital permission certificate that TV programme provides subsystem to issue that the digital permission certificate is issued subsystem.
Preferably, the digital permission certificate is issued subsystem and is comprised the multistage device of issuing, and wherein upper level is issued device and issued device to next stage and issue corresponding certificate, and the device of issuing of subordinate directly provides subsystem to issue the digital permission certificate to program; Described safety certification device storage provides any rank higher level's certificate of the digital permission certificate of subsystem corresponding to program.
The TV programme digital signature device is added to digital signature result and digital permission certificate and is undertaken by mode of thanksing for your hospitality or unperturbed mode in the video flowing.Wherein the mode of thanksing for your hospitality is the back that digital signature result and digital permission certificate directly is inserted into every section last frame of video flowing, and the unperturbed mode is to adopt the robust digital watermark technology that digital signature result and digital permission certificate are hidden in the video flowing.
Preferably, use the digital permission certificate that television program video is flow to the line number word signature and comprise video flowing is carried out segmentation, carry out Hash calculation respectively for each section video flowing then, the result of Hash calculation is carried out digital signature.
Preferably, the TV programme digital signature device is after carrying out digital signature to video flowing, further digital signature result and digital permission certificate are carried out error correction coding, digital signature result in the described video flowing that is added to and digital permission certificate are to have carried out digital signature result and the digital permission certificate after the error correction coding.
Preferably, the network transmit subsystem further comprises the filter that stores corresponding to higher level's certificate of the digital permission certificate of program provider, and whether be used for the digital permission certificate that superposes according to higher level's certification authentication video flowing legal, if, continue to transmit, otherwise abandon this video flowing.
A kind of digital television broadcasting method comprises:
A. for providing subsystem, digital program issues the digital permission certificate;
B. television program video is flow to the line number word signature, digital signature result and digital permission certificate are added in the video flowing, then this video flowing is sent to the transmission network;
C. after receiving, use the digital permission certificate that superposes in the higher level's certification authentication video flowing corresponding to the digital permission certificate whether legal from the video flowing that transmits network, if legal, execution in step d, otherwise abandon this video flowing, process ends;
D. verify whether the digital signature result that superposes in the video flowing is correct,, play this video flowing, otherwise abandon this video flowing if correct.
Step b may further include television program video stream is carried out segmentation, carry out Hash calculation respectively for each section video flowing then, described television program video is flow to the line number word signature is that Hash calculation result to each section video flowing carries out digital signature respectively.
Among the step b digital signature result and digital permission certificate be added to and undertaken by mode of thanksing for your hospitality or unperturbed mode in the video flowing.Wherein the mode of thanksing for your hospitality is that digital signature result and digital permission certificate directly are inserted into last frame back of every section video flowing, and the unperturbed mode is to adopt the robust digital watermark technology that digital signature result and digital permission certificate are hidden in the video flowing.
Issue a digital license passport in the present invention each television programming provider, television programming provider need carry out digital signature to video flowing when TV programme is provided, and the digital permission certificate of digital signature result and oneself is added to together is sent to end side in this video flowing, whether legal at the digital license of end side checking program provider then, whether the result is correct for the step of going forward side by side card data signature, if by all judgements, then play this video flowing, otherwise abandon this video flowing.
If unauthorized person transmits the illegal TV programme of network insertion by controlling wired or satellite etc. like this, because unauthorized person does not have the digital permission certificate of program provider, therefore the illegal TV programme of being inserted can be dropped in the checking of end side, even unauthorized person has obtained the digital permission certificate by various means, can be because he does not have private key yet can not be by the checking of digital signature result, thereby make the illegal TV programme of inserting be dropped.Therefore, the present invention can prevent effectively that unauthorized person from transmitting the illegal TV programme of network insertion by controlling wired or satellite etc.
Simultaneously, video flowing sends to end side because television programming provider must be added to the digital permission certificate of oneself, if therefore legal television programming provider has been play illegal TV programme, can find the source of this illegal TV programme so at an easy rate by the digital permission certificate of following this illegal TV programme, just be which television programming provider provides this illegal programs.Be aided with other criminal or economic punishment measures then and punish, other program provider of preparing to play illegal programs is caused fright, thereby prevented that from the source television programming provider from broadcasting illegal TV programme signal.
To sum up, the present invention has greatly improved the fail safe of digital television broadcasting.
In addition, the present invention also has good compatibility, and just as long as a safety certification device is installed on existing digital television, the present invention just can successfully realize in end side, thereby realization and existing systems is seamless integrated.
Simultaneously, the present invention also has good autgmentability, that is to say, television programming provider only need carry out once signed to program, and a lot of users can this signature of simultaneous verification, thereby makes the present invention be easy to expansion.
Description of drawings
Fig. 1 is the schematic diagram according to the digital television broadcasting system of prior art.
Fig. 2 is the schematic diagram according to digital television broadcasting system of the present invention.
Fig. 3 is the structural representation according to safety certification device of the present invention.
Fig. 4 is the schematic diagram that the digital permission certificate is issued subsystem.
Fig. 5 is the flow chart according to digital television broadcasting method of the present invention.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
In order to improve the fail safe of whole digit broadcasting system, in particular for solving that television programming provider broadcasts illegal TV programme signal and unauthorized person transmits the problem that network inserts illegal TV programme by control, the present invention issues the digital permission certificate to all program providers, and television program video flow to the line number word signature, digital signature result and digital permission certificate are added in the video flowing, verify the legitimacy of this digital permission certificate in end side, and whether certifying digital signature is correct, thereby the fail safe that effectively improves system.
Fig. 2 shows the schematic diagram according to digital television broadcasting system of the present invention.As shown in Figure 2, digital television broadcasting system 200 according to the present invention provides subsystem 201, TV signal broadcast subsystem 202, network transmit subsystem 203 and the terminal plays subsystem 204 except comprising TV programme, comprises further that also the digital permission certificate issues system 205.The digital permission certificate is issued system 205 and is used for providing subsystem 201 to issue the digital permission certificate to TV programme, and sends this certificate to TV programme subsystem 201 is provided, and uses for subsequent operation.It is multiple to it will be appreciated, of course, that the load mode here has, but no matter adopts any load mode, uses this certificate in the subsystem 201 as long as can provide in TV programme.
For different TV programme provides subsystem 201, mutually different digital permission certificate can be provided, that is to say that the digital permission certificate is unique, two TV programme can not occur provides subsystem 201 to have the situation of same numbers license passport.Here TV programme subsystem 201 and television programming provider can be one-to-one relationships, also can be that a television programming provider has a plurality of TV programme subsystems 201, for example can there be a plurality of channels or a plurality of making department in TV station, and each channel or each making department can have a digital license passport independently like this.The digital permission certificate is issued system 205 and is actually system of a certificate verification mechanism (CA).
When specifically issuing the digital permission certificate, it is right to need TV programme subsystem 201 at first to generate a public and private key, the TV programme subsystem 201 subtend digital permission certificate that uses public-key is issued system 205 application digital permission certificates then, the digital permission certificate is issued system 205 and is generated a digital license passport for this TV programme provides subsystem 201, wherein comprises the PKI of this public and private key centering.Then, the digital permission certificate is issued digital permission certificate that system 205 will comprise PKI and is sent to TV programme subsystem 201 is provided.
TV programme of the present invention provides subsystem 201 further to comprise TV programme digital signature device 211.Digital signature device 211 uses the private key of the public and private key centering of own generation that television program video is flow to the line number word signature, and digital signature result and digital permission certificate are added to sends in the video flowing of network transmit subsystem 203 then.
In the present invention preferably to video flowing, generally be moving picture expert group 2 (MEPG2) or digital audio/video encoding and decoding technique standard operation group (AVS) video flowing, carry out segmentation, for example 10M byte (just tens seconds) is one section, respectively each section being carried out Hash (hash) then calculates, use private key to carry out digital signature to result of calculation, for example carry out the RSA signature operation.Here specifically how carrying out Hash calculation and how carrying out the digital signature operation is known to those skilled in the art, therefore no longer describes in detail.
Above-mentionedly video flowing is carried out segmentation respectively each section to be carried out digital signature then be for the program that can in time find in each relatively short time cycle and corrigendum is distorted, thereby do not influence the fluency of playing programs, guaranteeing normally watching of TV programme to a greater extent when running into security attack in system.
After carrying out digital signature, for prevent that digital signature result and digital permission certificate from being decayed in transmission course, the influence of clutter, interference etc. and making can not normally be received at receiving terminal, preferably digital signature result and digital permission certificate are carried out error correction coding, just in digital signature result and digital permission certificate, insert redundant code, for example can use Reed-Solomon error correction coding mode with error correcting capability.
Then, digital signature device 211 will carry out the digital signature result of error correction coding and digital permission certificate and be added in the original video flowing, and along with this video flowing together is sent to end side through TV signal broadcast subsystem 202 and network transmit subsystem 203.The stacked system here has two kinds, and a kind of is the mode of thanksing for your hospitality, and another kind is the unperturbed mode, respectively this is carried out simple explanation below.
Thanks for your hospitality stacked system and can be last frame back that digital signature result and digital permission certificate with about 6K bit directly are inserted into former MPEG2 video stream data.Therefore this inserted mode has been destroyed original video flowing, must just can the normal play TV programme by the safety certification device that the back will describe in detail.
The unperturbed stacked system is to adopt the robust digital watermark technology that digital signature result and digital permission certificate are hidden in the video flowing, can not influence original MPEG2 video flowing like this, also just can not influence the encoding and decoding of original TV signal.In this case, even without in end side safety certification device being installed, digital television the samely can receive TV signal.The robust digital watermark technology is a kind of existing mature technology, here repeats no more.
It also is in order to make that the present invention is easy to carry out more that two kinds of stacked systems are provided here.Also generally do not install in as the digital television of playback terminal under the situation of safety certification device, can use the unperturbed mode to superpose, even user's digital television is not installed safety certification device like this, TV reception also can do as usual.Owing to be not that force users must be installed safety certification device, therefore make the present invention to be carried out gradually.On the contrary, if forcibly carry out the present invention, might can not obtain marketing because of not supporting of user.As time goes on, when all digital televisions, be that most of digital television has all been installed after the safety certification device at least, just can use the scrambling mode, thereby realize seamless transitions of the present invention, and finally be carried out fully.
At terminal plays subsystem 204 of the present invention, just digital television or for example set-top box can receiving digital signals similar device in, safety certification device 213 further is installed, safety certification device stores and is used to verify that TV programme provides higher level's certificate of the certificate of subsystem 201, whether be used for the digital permission certificate that superposes according to this higher level's certification authentication video flowing legal, and whether the digital signature result of checking video flowing is correct, only under situation by described two judgements, terminal plays subsystem 204 is play this video flowing, otherwise abandons this video flowing.
Specify the structure and the operation principle of safety certification device 213 below with reference to Fig. 3.
As shown in Figure 3, safety certification device 213 comprises that digital signature extraction unit 301, decoding unit 302, certificate extract and authentication unit 303, PKI decrypting device 313, Hash calculation unit 314, comparing unit 315, dividing cell 305 and control unit 306.After the video flowing that is superimposed with digital signature enters terminal plays subsystem 204, through entering the digital signature extraction unit 301 of safety certification device 213 after the processing of a series of prior aries.Digital signature extraction unit 301 extracts digital signature result and the digital permission certificate through error correction coding from this video flowing, the digital signature result and the digital permission certificate that extract are sent to decoding unit 302, the video flowing that will remove digital signature but comprise segment information sends to dividing cell 305, dividing cell 305 is divided into two-way with this video flowing then, to wherein one the tunnel already remove digital signature and also removed the video flowing of segment information and send to control unit 306, digital signature has been removed on another road but the video flowing that comprises segment information sends to Hash calculation unit 314.The segment information here can be the symbol that inserts later at one section video flowing, and with different at interval video flowing sections, segment information just is included in the video flowing when carrying out segmentation, and along with video flowing is input to digital signature extraction unit 301.In other words, send in the video flowing that is superimposed with digital signature result and digital permission certificate of digital signature extraction unit 301, also comprise this segment information.It can be directly to extract this segment information that dividing cell is removed segment information, thereby remaining video flowing is the video flowing that has removed segment information.
302 pairs of digital signature of decoding unit and certificate are decoded, this is because of digital signature and certificate are through on the video flowing that is added to after the error correction coding in the present embodiment, if in digital signature device 211, do not carry out error correction coding, can omit decoding unit 302 so here.Be sent to certificate extraction and authentication unit 303 through decoded digital signature and certificate.
Certificate extracts and authentication unit 303 stores higher level's certificate of the digital permission certificate that is used to verify program provider, after receiving digital signature and certificate, therefrom extract digital certificate, the digital certificate right and wrong of higher level's certification authentication extraction of use oneself are legal then, if, the PKI that comprises in digital signature and the certificate is sent to PKI decrypting device 313, otherwise notice control device 306 abandons this section video flowing.
Simultaneously, Hash calculation unit 314 carries out Hash calculation according to segment information to the segmentation of the video flowing that removes digital signature, then the Hash calculation result who obtains is sent to comparing unit 315.
Comparing unit 315 relatively is received from the Hash calculation end value after the deciphering of PKI decrypting device 313 and is received from the Hash calculation end value of the new calculating of Hash calculation unit 314, if two value couplings, for example equate, then indicate control unit 306 checkings to pass through, the video flowing that digital signature has been removed in control unit 306 outputs is for subsequent treatment and broadcast, and the user just can see the digital television program that program provider provides like this; On the contrary, if two values do not match, comparing unit 315 indication control units 306 abandon this section video flowing, and control unit 306 is carried out this section video flowing according to the indication of comparing unit 315 and abandoned operation, and the user just can not see illegal TV programme like this.
In the present invention, can directly provide the digital permission certificate to television programming provider.Alternately, the present invention can also issue system with the digital permission certificate and be divided into many levels, just can comprise the multistage device of issuing, wherein upper level is issued device and is issued device to next stage and issue corresponding sub-certificate, and the device of issuing of subordinate directly provides subsystem 201 to issue the digital permission certificate to program.
Specifically, as shown in Figure 4, the higher level's of a conduct root certificate authority device can be set, root certificate authority device stores the root certificate.Comprise that at the next stage of root certificate authority device civilian certificate authority device, military certificate authority device and international certificate issue device etc., wherein civilian certificate authority device stores civilian certificate, military certificate authority device stores military certificate, and international certificate is issued device and stored international certificate.Civilian certificate authority device is used for providing subsystem to issue the digital permission certificate to the commercial television program, military certificate authority device is used for providing subsystem to issue the digital permission certificate to the army television program, and international certificate is issued device and is used for providing subsystem to issue the digital permission certificate to external TV programme.The civilian certificate here, military certificate and international certificate are all issued by root certificate authority device.
The digital permission certificate is issued subsystem and is set to multilevel hierarchy, can adapt to the needs of " special television " well, and " special television " then is a new demand that proposes for digital television broadcasting system." special television " means that a certain television set can only receive the TV programme of a certain class or several classes, to adapt to the needs of consumer group's segmentation.For example, army television receives the program of inner TV station of army specially, the program of commercial television platform in the special receiving country of commercial television, and, then dispose foreign guest's special television of the outer station synchronization of special receiving country at some top restaurants.The realistic meaning of carrying out this segmentation is that commercial television should not receive the program of inner TV station of army, and foreign guest's special television also may there is no need the TV programme of television programming provider in the recipient country.
Issue under the situation that system is set to multilevel hierarchy at the digital permission certificate, in the safety certification device 213 of terminal plays subsystem 204, can store different higher level's certificates, higher level's certificate here can be the certificate that upper level is issued device, for example civilian certificate, also can be the certificate of issuing device of going up two-stage, for example root certificate.For example, if storage is civilian certificate, the program of the program of inner TV station of army and external TV station can not extract and the checking of authentication unit 303 by certificate so, thereby be dropped, and the user just can not watch corresponding program like this.Equally, if storage is military certificate, the program of the program of commercial television platform and external TV station can not extract and the checking of authentication unit 303 by certificate so, thereby be dropped.If safety certification device 213 is stored military certificate and civilian certificate simultaneously, so just can watch the program of the inner TV station of program and army of commercial television platform simultaneously.If safety certification device 213 has been stored the root certificate, the user just can watch the program that all television programming providers provide so.By the different higher level's certificate of storage in safety certification device 213, can realize requirement effectively like this to " special television ".
In addition, in network transmit subsystem 203 of the present invention, can also further increase a filter 212, this filter 212 stores the higher level's certificate corresponding to the digital permission certificate of program provider, whether legal, and whether the digital signature result of checking video flowing is correct if being used for the digital permission certificate that superposes according to this higher level's certification authentication video flowing, only under the situation by described two judgements, filtering module is exported this video flowing, otherwise abandons this video flowing.That is to say that the 26S Proteasome Structure and Function of filter 212 and safety certification device 213 is similar, and can be used as filter 212 uses with safety certification device 213 fully.Certainly, issue under the situation that system 205 comprises multilevel hierarchy at the digital permission certificate, filter 212 also can be stored different higher level's certificates, thereby realizes filtering flexibly.
Here, the purpose that filter 212 further is installed is to play the effect of maltilevel security checking, thereby further improves fail safe of the present invention.In actual conditions, can filter 212 be installed at some network segment that needs, then filter 212 can be installed at those unwanted network segments.
Understand structure and operation principle above in detail, below with reference to the course of work of Fig. 5 explanation according to digital television broadcasting method of the present invention according to digital television broadcasting system of the present invention.
As shown in Figure 5,, at first issue unique digital permission certificate, comprise the PKI of public and private key centering in this digital permission certificate for different TV programme provides subsystem in step 501.
In step 502, use private key that television program video is flow to the line number word signature.Here video flowing is signed and can be carried out segmentation to video flowing earlier, then digital signature is carried out in each segmentation respectively.
In step 503, digital signature result and digital permission certificate are added in the video flowing.The stack here can be undertaken by the mode of thanksing for your hospitality, and also can be undertaken by the unperturbed mode.
In step 504, the video flowing that is superimposed with digital signature result and digital permission certificate is sent to the transmission network.
In step 505, after receiving from the video flowing that transmits network, whether the digital permission certificate that superposes in higher level's certification authentication video flowing of use corresponding to the digital permission certificate is legal, if it is legal, execution in step 506, otherwise execution in step 508 just abandons this video flowing, process ends.
In step 506, whether the digital signature result that superposes in the checking video flowing is correct, if correct, play this video flowing in step 507, otherwise abandons this video flowing in step 508.
Whether correct step specifically can comprise the PKI decrypted digital signature result who uses in the digital certificate to the certifying digital signature result, obtain the Hash calculation end value, then Hash calculation is carried out in the same segmentation of the video flowing that removes digital signature, obtain the Hash calculation end value, relatively whether two values mate then.
Safety certification device of the present invention can form an independent chip, then this chip is integrated in digital television or the set-top box.In addition, safety certification device also can be integrated on the existing chip, for example on the decoder chip.
Be that example has illustrated the present invention with digital TV video frequency stream above, thought of the present invention can also be applied among the IPTV, like this a safety certification device can be installed in the router of IP network, thereby the video flowing that transmits in the IP network is authenticated.
Therefore being appreciated that above-mentioned only is displaying to spirit of the present invention, rather than restriction.
Claims (10)
1, a kind of digital television broadcasting system comprises:
TV programme provides subsystem, is used to provide the digital television program video flowing;
The TV signal broadcast subsystem is used for the video flowing that TV programme provides subsystem to provide is sent to the network transmit subsystem;
The network transmit subsystem, the video flowing that is used for being received from the TV signal broadcast subsystem is sent to the terminal plays subsystem;
The terminal plays subsystem is used to play the video flowing that is received from the network transmit subsystem,
It is characterized in that,
This digital television broadcasting system comprises that further the digital permission certificate issues subsystem, is used for providing subsystem to issue the digital permission certificate to TV programme, and this digital permission certificate is used to provide the checking that TV programme is provided subsystem;
TV programme provides subsystem further to comprise the TV programme digital signature device, be used for television program video is flow to the line number word signature, then digital signature result and digital permission certificate being added to sends in the video flowing of network transmit subsystem, and this digital signature is used to provide the checking to content of TV program;
The terminal plays subsystem further comprises and self stores the safety certification device of higher level's certificate that the digital permission certificate of subsystem is provided corresponding to program, whether be used for the digital permission certificate that superposes according to this higher level's certification authentication video flowing legal, and whether the digital signature result of checking video flowing is correct, only under situation by described two checkings, the terminal plays subsystem is play this video flowing, otherwise abandons this video flowing.
According to the digital television broadcasting system of claim 1, it is characterized in that 2, it is mutually different to the digital permission certificate that TV programme provides subsystem to issue that described digital permission certificate is issued subsystem.
3, according to the digital television broadcasting system of claim 1, it is characterized in that, described digital permission certificate is issued subsystem and is comprised the multistage device of issuing, wherein upper level is issued device and is issued device to next stage and issue corresponding certificate, and the device of issuing of subordinate directly provides subsystem to issue the digital permission certificate to program; Described safety certification device storage provides any rank higher level's certificate of the digital permission certificate of subsystem corresponding to program.
4, according to the digital television broadcasting system of claim 1, it is characterized in that, described TV programme digital signature device is added to digital signature result and digital permission certificate and is undertaken by mode of thanksing for your hospitality or unperturbed mode in the video flowing, wherein the mode of thanksing for your hospitality is the back that digital signature result and digital permission certificate directly is inserted into every section last frame of video flowing, and the unperturbed mode is to adopt the robust digital watermark technology that digital signature result and digital permission certificate are hidden in the video flowing.
5, according to the digital television broadcasting system of claim 1, it is characterized in that, describedly television program video is flow to the line number word signature comprise video flowing is carried out segmentation, carry out Hash calculation respectively for each section video flowing then, the result of Hash calculation is carried out digital signature.
6, according to the digital television broadcasting system of claim 1, it is characterized in that, described TV programme digital signature device is after carrying out digital signature to video flowing, further digital signature result and digital permission certificate are carried out error correction coding, digital signature result in the described video flowing that is added to and digital permission certificate are to have carried out digital signature result and the digital permission certificate after the error correction coding.
7, according to the digital television broadcasting system of claim 1, it is characterized in that, described network transmit subsystem further comprises and stores the filter of higher level's certificate that the digital permission certificate of subsystem is provided corresponding to TV programme, whether be used for the digital permission certificate that superposes according to higher level's certification authentication video flowing legal, and whether the video flowing that checking is signed is legal, if continue to transmit, otherwise abandon this video flowing.
8, a kind of digital television broadcasting method comprises:
A. issue the digital permission certificate for digital program provides subsystem, this digital permission certificate is used to provide the checking that TV programme is provided subsystem;
B. television program video is flow to the line number word signature, digital signature result and digital permission certificate are added in the video flowing, then this video flowing is sent to the transmission network, this digital signature is used to provide the checking to content of TV program;
C. after receiving, use the digital permission certificate that superposes in the higher level's certification authentication video flowing corresponding to the digital permission certificate whether legal from the video flowing that transmits network, if legal, execution in step d, otherwise abandon this video flowing, process ends;
D. verify whether the digital signature result that superposes in the video flowing is correct,, play this video flowing, otherwise abandon this video flowing if correct.
9, method according to Claim 8, it is characterized in that, step b further comprises television program video stream is carried out segmentation, carry out Hash calculation respectively for each section video flowing then, described television program video is flow to the line number word signature is that Hash calculation result to each section video flowing carries out digital signature respectively.
10, method according to Claim 8, it is characterized in that, among the described step b digital signature result and digital permission certificate be added to and undertaken by mode of thanksing for your hospitality or unperturbed mode in the video flowing, wherein the mode of thanksing for your hospitality is that digital signature result and digital permission certificate directly are inserted into every section video flowing last frame back, and the unperturbed mode is to adopt the robust digital watermark technology that digital signature result and digital permission certificate are hidden in the video flowing.
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| CN101567738B (en) * | 2008-04-24 | 2015-01-07 | 威盛电子(中国)有限公司 | Multi-media broadcasting device and multi-media broadcast receiving device |
| CN101651507B (en) * | 2008-08-15 | 2013-05-29 | 威盛电子(中国)有限公司 | Method and system for securely playing multimedia broadcast content and multimedia broadcast system |
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