CN101505402B - Authentication method for uni-directional network digital television conditional receiving system terminal deciphering module - Google Patents
Authentication method for uni-directional network digital television conditional receiving system terminal deciphering module Download PDFInfo
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- CN101505402B CN101505402B CN2009103007177A CN200910300717A CN101505402B CN 101505402 B CN101505402 B CN 101505402B CN 2009103007177 A CN2009103007177 A CN 2009103007177A CN 200910300717 A CN200910300717 A CN 200910300717A CN 101505402 B CN101505402 B CN 101505402B
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Abstract
The invention relates to a conditional access system for a digital television. The invention discloses a method for authenticating a terminal decryption module of the conditional access system of a unilateral network digital television, which comprises the following steps that: a, a front end embeds first authentication data and an authentication time window into extension bytes of authenticated control information and allocates the extension bytes to each conditional access system terminal of the digital television; b, the terminal decryption module decrypts the first authentication data to obtain a first decryption result and sets the authentication time window; c, the terminal sends the first decryption result to an authentication data transceiver; d, the authentication data transceiver sends the first decryption result to an authentication end which performs legal verification and sends a legal verification result to the authentication data transceiver; and e, the terminal judges whether the legal verification result of the authentication data transceiver is transmitted back to the authentication time window, and further judges the legality verification result. The conditionalaccess system is provided with a decryption module active anti-piracy mechanism to protect the legal advantages of operators.
Description
Technical field
The present invention relates to digital television techniques, particularly digital television conditional access system.
Background technology
Condition reception technique (Conditional Access; CA) be the technology that the control user receives the broadcasting service mandate; Realization has only and pays and could receive the TV programme and the service business of prior reservation through the user after authorize allowing, and unpaid user then can't obtain related service.Its basic purpose is through authorization control and management to the user, realizes the paid service of digital television broadcasting, bringing the benefit repayment for digital-tv operator when, also for the user more, higher-quality digital broadcast service is provided.Condition receives and encrypts, deciphering module is to realize that digital TV conditional receives the core of control; For reaching the unauthorized digital television business that obtains; Obtain the purpose of unlawful interests, the hacker of lot of domestic and foreign adopts the different techniques means that condition receiving system is attacked.The digital television conditional access system of current popular seems as safe as a house; Through 3 infill layers; Or multiple layer encrypting protection associated authorization information more, but system is made up of a plurality of links after all, and the hacker can be according to the characteristics of system; Adopt different attack method attacking system weak links, the record that all has related system to be broken both at home and abroad.
Condition receiving and deciphering module is the Primary Component that embeds digital TV terminal, is embedded in decrypted key data in the digital television terminal system with the form of CPU smart card or chip.Deciphering module is dispersed in the TV user as deciphering control key and goes; The hacker can adopt very convenient, cheap mode to obtain legal deciphering module; The development and testing instrument of use standard; Decode key data, authorization data and application program, make pirate deciphering module, so deciphering module is a link the weakest in the condition receiving system, that subject to attack most.The most provinces and cities of simultaneously current China digital TV network is traditional unilateral network; Only support that the broadcast data of propelling movement mode is professional; Initiatively authentication is machine-processed to deciphering module for shortage, because can't obtain the information of deciphering module legitimacy, digital-tv operator is no judge of whether there is pirate phenomenon in the network; Even and if know and pirate deciphering module occurred; Also method navigates to particular user, and operator is in helpless condition basically, the operator legal economy return that has greatly damaged.
Summary of the invention
Technical problem to be solved by this invention is, propose a kind of be easy to realize in the unilateral network environment to digital television conditional receiving system terminal in deciphering module initiatively carry out the method for legitimacy authentication.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be, the authentication method of uni-directional network digital television conditional receiving system terminal deciphering module may further comprise the steps:
A, digital television conditional access system front end are encrypted first random number of its generation, generate first authorization data, and first authorization data and authentication time window are embedded in the extended byte of Entitlement Control Message; And first random number is sent to authentication end;
B, digital television conditional access system front end are distributed to each digital television conditional receiving system terminal with said Entitlement Control Message;
First authorization data in the extended byte of c, digital television conditional receiving system terminal extraction Entitlement Control Message; Deciphering module in the digital television conditional receiving system terminal carries out decryption oprerations to first authorization data; Obtain first decrypted result, and authentication time window is set;
D, user are behind digital television conditional receiving system terminal input identity code, and digital television conditional receiving system terminal sends first decrypted result to authentication data transceiver;
E, user are behind authentication end input identity code; Authentication data transceiver is sent to authentication end with first decrypted result and carries out legitimate verification; Authentication end compares first decrypted result and first random number; If comparative result is identical, then the legitimate verification result is legal, otherwise is illegal; Authentication end is sent to authentication data transceiver with the legitimate verification result;
F, digital television conditional receiving system terminal judge whether that the legitimate verification result of authentication data transceiver passes back in authentication time window, as denying authentification failure; In this way, then further judge the legitimate verification result, if the legitimate verification result is legal, authentication success then, otherwise, authentification failure.
Study remote controller is used widely as the standard configuration of digital TV terminal at present, and its operation principle is with signal replication, handles and storage, and reduction emission then can be stored mass data.Therefore, study remote controller can be used as authentication data transceiver of the present invention, and study remote controller communicates through its infrared ray transceiver module and digital television conditional receiving system terminal, authentication end.
Adopt which kind of encryption, decipherment algorithm to appoint in advance to first random number by digital television conditional access system front end and digital television conditional receiving system terminal; For make to encrypt, decipherment algorithm is more flexible, also can introduce terminal deciphering algorithm preference pattern: the digital television conditional access system front end also embeds terminal deciphering algorithm preference pattern in the Entitlement Control Message extended byte among the step a; Digital television conditional receiving system terminal passes through to extract the terminal deciphering algorithm preference pattern in the Entitlement Control Message extended byte among the step c, thereby takes corresponding decipherment algorithm that first authorization data is carried out decryption oprerations.
Further; The present invention not only can carry out the legitimacy authentication to deciphering module from the deciphering accuracy aspect to deciphering module; Also can carry out the legitimacy authentication to deciphering module from the encryption accuracy aspect of deciphering module: the digital television conditional access system front end also generates second random number the step a; And second random number embedded in the extended byte of Entitlement Control Message, and second random number is sent to authentication end; Digital television conditional receiving system terminal also extracts second random number in the extended byte of Entitlement Control Message among the step c; And second random number is carried out cryptographic operation through the deciphering module in the digital television conditional receiving system terminal; Obtain second authorization data, and generate authentication end decipherment algorithm preference pattern; In the steps d, digital television conditional receiving system terminal also is sent to authentication data transceiver with second authorization data and authentication end decipherment algorithm preference pattern; Authentication data transceiver also is sent to authentication end with second authorization data and authentication end decipherment algorithm preference pattern and carries out legitimate verification among the step e; Authentication end is deciphered second authorization data according to authentication end decipherment algorithm preference pattern, and second decrypted result that obtains and second random number are compared; If first decrypted result is identical with the comparative result of first random number, and second decrypted result is identical with the comparative result of second random number, and then the legitimate verification result is legal, otherwise is illegal.
Further; In order to guarantee the legitimacy of authentication end; The present invention has introduced the 3rd random number the informed source of authentication end is carried out authentication: digital television conditional receiving system terminal also generates the 3rd random number in the steps d, and send the 3rd random number to authentication data transceiver; Authentication data transceiver also is sent to authentication end with the 3rd random number among the step e; Authentication end is encrypted the 3rd random number and is obtained the external authentication data; Authentication end is sent to authentication data transceiver with the external authentication data; Digital television conditional receiving system terminal has judged whether that the external authentication data pass back among the step f in authentication time window, as not, and authentification failure; In this way, at first decipher the external authentication data, obtain the 3rd decrypted result and judge whether the 3rd decrypted result is consistent with the 3rd random number; In this way, further judge the legitimate verification result again, if the legitimate verification result is legal; Authentication success then, otherwise, authentification failure.
Further; For the safety of data that guarantees that digital television conditional receiving system terminal sends out: digital television conditional receiving system terminal also generates decrypted authentication information algorithm sign in the steps d, and digital television conditional receiving system terminal is encrypted authentication end decipherment algorithm preference pattern, second authorization data, first decrypted result, the 3rd random number according to the corresponding AES of decrypted authentication information algorithm sign; Authentication end is extracted decrypted authentication information algorithm sign earlier among the step e, after the corresponding decipherment algorithm of selection decrypts authentication end decipherment algorithm preference pattern, second authorization data, first decrypted result, the 3rd random number, carries out legitimate verification again.
The invention has the beneficial effects as follows, can accomplish the authentication of deciphering module, increase initiatively anti-piracy mechanism of deciphering module, the legitimate interests of protection operator.
Those skilled in the art can according to the real needs of actual conditions, make up above-mentioned technical characterictic according to above-mentioned explanation fully.Below through embodiment the present invention is described further.
Embodiment
The uni-directional network digital television service supporting platform; Comprise the digital TV front-end broadcast system, digital television conditional access system front end, HFC hybrid fiber coax/surface wave transmission network; One-way set-top box (digital television conditional receiving system terminal; Hereinafter to be referred as the terminal) and study remote controller (authentication data transceiver), the present invention has also increased authentication end for encrypting module is carried out authentication on this basis, and authentication end is arranged on the place of operator's appointment.
Authentication step to encrypting module in the STB is following:
(1) digital television conditional access system front end (hereinafter to be referred as front end) authentication message generates and distribution:
In the time of need carrying out the deciphering module authentication, front end generates the random number of 28 bytes at random, i.e. first random number and second random number, and these two random numbers are sent to authentication end.The front end authentication information that generates is as shown in the table:
Wherein 1 byte is carried out enciphering transformation with the picked at random AES in the software cryptography device, produces encrypt data, and application model is provided with 0x01, and the authentication information of generation is added in the extended byte of Entitlement Control Message (ECM), generates complete ECM bag.Multiplexing back is in hfc plant or surface wave transmission through network, and the deciphering module authentication is carried out at the notice terminal.If application model is provided with 0x00, then do not carry out authentication, the ECM bag does not have the extended byte of authentication.In the existing technology, Entitlement Control Message is totally 188 bytes, generally uses time, the program price of part byte-identifier digital television program wherein, the program control word after encrypting etc., and no byte is filled with random number.After the terminal reads authentication time window, the timing of starting terminal timer.
(2) the terminal authentication authentication information generates:
The parsing kernel Direct Filtration ECM at terminal bag in the prior art, and give the deciphering module deciphering, deciphering module only submits to the result of deciphering to supply the terminal descrambling by the program stream of scrambling, does not possess the function to external feedback ECM internal information.The present invention need construct new terminal parses kernel; Except filtering, decipher the ECM; Can also choose suitable algorithm deciphering front end ciphered data (first authorization data) by the requirement of authentication message in the ECM extended byte, and encrypt second random number in the extended byte; While acquisition terminal facility information, Entitlement Control Message, rating sample information etc., and generate the 3rd random number that is used for external authentication.The terminal authentication authentication information that terminal deciphering module generates is following:
The personal key that second authorization data, first decrypted result, digital program information, rating sample information, terminal equipment information in the last table all uses deciphering module to hold in close confidence is encrypted, and the authentication terminal selects corresponding decipherment algorithm that these data are deciphered after the authentication end decipherment algorithm preference pattern that reads.Take the byte-sized X1, X2, X3, X4 of deciphering module physics number in the last table, digital program information, rating sample information, terminal equipment information represent to choose flexibly according to actual conditions.
(3) the terminal authentication authentication information is gathered:
Digital cable customers is behind the correct PIN code of input (identity code) on the study remote controller; The terminal authentication authentication information that terminal deciphering module generates is sent to study remote controller with the ECM bag; Study remote controller is stored in the terminal authentication authentication information in the study remote controller after resolving the infrared signal waveform, outwards sends this terminal authentication authentication information through study remote controller infrared signal waveform again.
(4) terminal authentication authentication information legitimacy authentication:
The time window that is requiring; Digital cable customers is sent to study remote controller in the place of operator's appointment; The user can be with the data read authentication end of study remote controller storage after importing correct PIN code; And to deciphering module add, after the authentication of decrypted data legitimacy; Carry out data mining through the authentication information that then terminal is generated again, promptly data such as analysis-by-synthesis deciphering module physics number, digital program information, rating sample information, terminal equipment information are done further legitimacy authentication.Because authentication information is sent with ECM, it is that same time point generates that the terminal generates authentication information, therefore can further carry out legitimacy based on certain rule and judge, exists the same account of a plurality of deciphering module physics number to use constantly as one; The same physics of synchronization number has many station terminals use; The same physics of synchronization number is watched same program; A certain physics number does not repeatedly carry out authentication etc., can tentatively judge to have pirate deciphering module phenomenon, can the normal use of validated user be protected after further confirming, stops the use of pirate deciphering module simultaneously.
That is, the legitimacy authentication to deciphering module comprises following 4 points:
1, first decrypted result is consistent with first random number that front end issues;
2, consistent according to second authorization data after the deciphering of authentication end decipherment algorithm preference pattern with second random number;
3, collection digital program information is consistent with the digital program information that front end licenses to this terminal;
4, deciphering module physics number, rating sample information, terminal equipment information satisfy rule;
More than 4 satisfy simultaneously, then the legitimate verification result be legal, have satisfied then be judged to be illegal.
After the legitimate verification result generated, authentication end was encrypted the 3rd random number, generated the external authentication data.Authentication end is sent to study remote controller with the infrared signal form that the legitimate verification result passes through with the external authentication data.Information such as the AES that the time of legitimacy authentication next time, authentication are used, key also can be sent to study remote controller simultaneously.In order to guarantee legitimate verification result's fail safe, also can encrypt it again.
(5) authentication information legitimacy is confirmed
In the authentication time window that requires, terminal deciphering module must receive the legitimate verification result, otherwise will stop the use at terminal.The data TV user is after study remote controller input correct PIN code; The user can outwards send the data in the study remote controller through the infrared signal waveform, and the terminal receives infrared signal and resolves, through deciphering the external authentication data; Decrypted result and the 3rd random number are compared; Checking is provided with according to legitimate verification results modification algorithm through after the legitimacy of authentication end again, is legal like the legitimate verification result promptly; Then authentication is passed through, and information such as the AES that the time of the authentication of legitimacy next time that the terminal basis receives, authentication are used, key dynamically update the information of encrypted authentication process; Like the legitimate verification result is illegal, and the terminal will stop to provide the rating service.The information that dynamically updates the encrypted authentication process can prevent that illegal code breaker from following the tracks of specific algorithm, even it can be decoded once, but still can't decode next time, or decode and surpassed authentication time window.
Damage like study remote controller; The user can the manual extraction terminal deciphering module generates behind the correct PIN code of input the authentication information data; And be submitted to the place of operator's appointment, and the data that generate after operator's authentication, importing behind the correct PIN code can the manual input at the terminal; Save authentication period and the convenience that improves authentication like needs; The user can the manual extraction terminal deciphering module generates behind the correct PIN code of input the authentication information data; And be submitted to authentication platforms such as operator's specified web, telephone number, SMS platform and carry out authentication; The data that generate after the authentication are simultaneously used the manual input of study remote controller key mode behind the correct PIN code of input, or the manual input at the terminal.
Claims (7)
1. the authentication method of uni-directional network digital television conditional receiving system terminal deciphering module is characterized in that, may further comprise the steps:
A, digital television conditional access system front end are encrypted first random number of its generation, generate first authorization data, and first authorization data and authentication time window are embedded in the extended byte of Entitlement Control Message; And first random number is sent to authentication end;
B, digital television conditional access system front end are distributed to each digital television conditional receiving system terminal with said Entitlement Control Message;
First authorization data in the extended byte of c, digital television conditional receiving system terminal extraction Entitlement Control Message; Deciphering module in the digital television conditional receiving system terminal carries out decryption oprerations to first authorization data; Obtain first decrypted result, and authentication time window is set;
D, user are behind digital television conditional receiving system terminal input identity code, and digital television conditional receiving system terminal sends first decrypted result to authentication data transceiver;
E, user are behind authentication end input identity code; Authentication data transceiver is sent to authentication end with first decrypted result and carries out legitimate verification; Authentication end compares first decrypted result and first random number; If comparative result is identical, then the legitimate verification result is legal, otherwise is illegal; Authentication end is sent to authentication data transceiver with the legitimate verification result;
F, digital television conditional receiving system terminal judge whether that the legitimate verification result of authentication data transceiver passes back in authentication time window, as denying authentification failure; In this way, then further judge the legitimate verification result, if the legitimate verification result is legal, authentication success then, otherwise, authentification failure.
2. the authentication method of uni-directional network digital television conditional receiving system terminal deciphering module according to claim 1; It is characterized in that; Said authentication data transceiver is a study remote controller, and study remote controller communicates through its infrared ray transceiver module and digital television conditional receiving system terminal, authentication end.
3. the authentication method of uni-directional network digital television conditional receiving system terminal deciphering module according to claim 1 or claim 2; It is characterized in that the digital television conditional access system front end also embeds terminal deciphering algorithm preference pattern in the Entitlement Control Message extended byte among the step a;
Digital television conditional receiving system terminal passes through to extract the terminal deciphering algorithm preference pattern in the Entitlement Control Message extended byte among the step c, thereby takes corresponding decipherment algorithm that first authorization data is carried out decryption oprerations.
4. like the authentication method of the said uni-directional network digital television conditional receiving system terminal deciphering module of claim 3; It is characterized in that; The digital television conditional access system front end also generates second random number among the step a; And second random number embedded in the extended byte of Entitlement Control Message, and second random number is sent to authentication end;
Digital television conditional receiving system terminal also extracts second random number in the extended byte of Entitlement Control Message among the step c; And second random number is carried out cryptographic operation through the deciphering module in the digital television conditional receiving system terminal; Obtain second authorization data, and generate authentication end decipherment algorithm preference pattern;
In the steps d, digital television conditional receiving system terminal also is sent to authentication data transceiver with second authorization data and authentication end decipherment algorithm preference pattern;
Authentication data transceiver also is sent to authentication end with second authorization data and authentication end decipherment algorithm preference pattern and carries out legitimate verification among the step e; Authentication end is deciphered second authorization data according to authentication end decipherment algorithm preference pattern, and second decrypted result that obtains and second random number are compared; If first decrypted result is identical with the comparative result of first random number, and second decrypted result is identical with the comparative result of second random number, and then the legitimate verification result is legal, otherwise is illegal.
5. like the authentication method of the said uni-directional network digital television conditional receiving system terminal deciphering module of claim 4; It is characterized in that; Digital television conditional receiving system terminal also generates the 3rd random number in the steps d, and sends the 3rd random number to authentication data transceiver; Authentication data transceiver also is sent to authentication end with the 3rd random number among the step e; Authentication end is encrypted the 3rd random number and is obtained the external authentication data; Authentication end is sent to authentication data transceiver with the external authentication data; Digital television conditional receiving system terminal has judged whether that the external authentication data pass back among the step f in authentication time window, as not, and authentification failure; In this way, at first decipher the external authentication data, obtain the 3rd decrypted result and judge whether the 3rd decrypted result is consistent with the 3rd random number; In this way, further judge the legitimate verification result again, if the legitimate verification result is legal; Authentication success then, otherwise, authentification failure.
6. like the authentication method of the said uni-directional network digital television conditional receiving system terminal deciphering module of claim 5; It is characterized in that; Digital television conditional receiving system terminal also will extract its inner deciphering module physics number, digital program information, rating sample information and terminal equipment information in the steps d, and send deciphering module physics number, digital program information, rating sample information and terminal equipment information to authentication data transceiver; Authentication data transceiver also will combine deciphering module physics number, digital program information, rating sample information and terminal equipment information to carry out legitimate verification among the step e.
7. like the authentication method of the said uni-directional network digital television conditional receiving system terminal deciphering module of claim 6; It is characterized in that; Digital television conditional receiving system terminal also generates decrypted authentication information algorithm sign in the steps d, and digital television conditional receiving system terminal is encrypted authentication end decipherment algorithm preference pattern, second authorization data, first decrypted result, digital program information, rating sample information, terminal equipment information and the 3rd random number according to the corresponding AES of decrypted authentication information algorithm sign; Authentication end is extracted decrypted authentication information algorithm sign earlier among the step e; After selecting corresponding decipherment algorithm to decrypt authentication end decipherment algorithm preference pattern, second authorization data, first decrypted result, digital program information, rating sample information, terminal equipment information and the 3rd random number, carry out legitimate verification again.
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| CN101699859B (en) * | 2009-11-04 | 2012-09-12 | 四川虹微技术有限公司 | Method for upgrading deciphering chip of conditional access system of digital TV |
| CN105451038A (en) * | 2015-11-16 | 2016-03-30 | 深圳市创维软件有限公司 | Code generation method, code authentication method, related device and system |
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| EP1722564A1 (en) * | 2005-05-13 | 2006-11-15 | Nagra France Sarl | Local conditional access method for mobile receivers |
| CN201063763Y (en) * | 2007-07-10 | 2008-05-21 | 吴怀正 | Digital signal condition receiving system |
| CN101222608A (en) * | 2008-01-03 | 2008-07-16 | 济南市泰信电子有限责任公司 | Digital television condition receiving system and processing flow thereof |
| CN201142735Y (en) * | 2008-01-03 | 2008-10-29 | 济南市泰信电子有限责任公司 | Digital television conditional access system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1722564A1 (en) * | 2005-05-13 | 2006-11-15 | Nagra France Sarl | Local conditional access method for mobile receivers |
| CN201063763Y (en) * | 2007-07-10 | 2008-05-21 | 吴怀正 | Digital signal condition receiving system |
| CN101222608A (en) * | 2008-01-03 | 2008-07-16 | 济南市泰信电子有限责任公司 | Digital television condition receiving system and processing flow thereof |
| CN201142735Y (en) * | 2008-01-03 | 2008-10-29 | 济南市泰信电子有限责任公司 | Digital television conditional access system |
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