CN101404751A - Digital broadcast receiving device and method - Google Patents
Digital broadcast receiving device and method Download PDFInfo
- Publication number
- CN101404751A CN101404751A CNA2008101320410A CN200810132041A CN101404751A CN 101404751 A CN101404751 A CN 101404751A CN A2008101320410 A CNA2008101320410 A CN A2008101320410A CN 200810132041 A CN200810132041 A CN 200810132041A CN 101404751 A CN101404751 A CN 101404751A
- Authority
- CN
- China
- Prior art keywords
- mentioned
- key
- scrambling
- scrambling key
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention provides a digital broadcast receiving device and method for preventing the mistake use of scrambling cipher key information received and dispatched between an IC card and a CA module. A digital broadcast receiving device (10) connects the CA module for performing restricted receiving of digital broadcast to the IC card, to obtain the encrypted scrambling key (126), uses the scrambling key (120) and decrypted scrambling key (128) temporarily stored in a scrambling key holding buffer (50) and a decryption scrambling key holding buffer (26), respectively, to generate an encryption key (124) and a decryption key (132). At this point, the use of scrambling key stored during the last receiving handling, can encrypt the scrambling key information received and dispatched between the CA module (20) with the IC card (40) with a high-security, so that the scrambling key can be used to descramble the digital broadcast and can only restrict prescribed receiver to receive.
Description
Technical field
The present invention relates to digital broacast receiver and method of reseptance thereof, particularly can limit the receiving system and the method for reseptance thereof of receiving digital broadcast.
Background technology
In the past, in digital broadcastings such as satellite, ground digital television broadcast,, adopted to limit receive mode as preventing one of contents management method of improper reception.For example, in the forwarding office side, utilize broadcast messages such as video after scrambling (scramble) secret key encryption and voice, comprise the public information of the scrambling key that utilizes after working key is encrypted and program information data and comprise the working key that utilizes after master key is encrypted and the independent information of each recipient's CAMEL-Subscription-Information data multiplexed, send with the form of TS (Transport Stream) signal.
On the other hand, in the receiving system side, in for example CA (Conditional Access) module, receive the TS signal, it is separated into broadcast information signal, independent information signal (EMM:Entitlement Management Message) signal and public information (ECM:Entitlement Control Message) signal.In addition, by the recipient electronic media that obtains in advance through regular procedure is connected with receiving system, EMM signal and ECM signal are sent in the electronic media, in electronic media, utilize the master key that writes down in advance with independent decrypts information.The working key that use is taken out from decrypted independent information with the public information deciphering, takes out the scrambling key, in delivering to receiving system, in the receiving system side, uses this scrambling key with broadcast message deciphering such as the video encrypted and voice.
In addition, in the digit broadcasting system that patent documentation 1 is put down in writing, such system is disclosed, that is, when the receiving system working key outflows, can determine to become the identifier (ID) of the receiving system in outflow source, ID by making this receiving system is invalid, can realize the outflow countermeasure of key.
[patent documentation 1] TOHKEMY 2005-110053 communique
In the limited reception apparatus and method of reseptance thereof of in the past digital broadcasting, utilize the scrambling key to encrypt the signal from the forwarding office to the receiving system, but be sent to receiving system with the state of not encrypting from the decrypted scrambling key electronic media that receiving system sends.Therefore, exist in the signal of receiving and dispatching between electronic media and the receiving system, the people beyond the recipient that might be prescribed observes, and causes the worry of scrambling key outflow.And when this information was disclosed on the internet, the data of video and voice might be by the not people institute audiovisual of qualified majority.
Summary of the invention
The objective of the invention is, a kind of defective of eliminating such conventional art is provided, even for example the signal of receiving and dispatching between electronic media and receiving system is observed, the quilt that also can prevent improper use is the digital broacast receiver and the digital broadcast receiving method of qualified majority people audiovisual not.
In order to solve the above problems, the invention provides a kind of digital broacast receiver that is used for receiving digital broadcast, it has CA (Conditional Access) module, and electronic media, this CA module receives the received signal with scrambled broadcast information signal of sending from forwarding office, the scrambling key that uses regulation is this scrambled broadcast information signal descrambling, this electronic media can be connected with this CA module with plugging, generate above-mentioned scrambling key, and encrypt, send to above-mentioned CA module, it is characterized in that, this electronic media has: scrambling secret key encryption unit, it uses the above-mentioned scrambling key that encryption keys generated of regulation, and offers the CA module; Scrambling key holding unit, it stores the scrambling key that is generated, and keeps the scrambling key of specified quantity; With the encryption key arithmetic element, its from scrambling key holding unit, obtain on this device once receive be stored in when handling in the scrambling key holding unit on once scrambling key, and according to this last scrambling key, the computing encryption key, the CA module has: the scrambling cipher key decryption unit, it obtains encrypted scrambling key from electronic media, and the decruption key that uses regulation is to this scrambling secret key decryption; Deciphering scrambling key holding unit, it is stored in scrambling key decrypted in this scrambling cipher key decryption unit, and keeps the decrypted scrambling key of specified quantity; With the decruption key arithmetic element, its from deciphering scrambling key holding unit, obtain on this device, once receive be stored in when handling decipher in the scrambling key holding unit on once scrambling key, and, calculate decruption key according to the scrambling key of last time.
And, a kind of digital broacast receiver of receiving digital broadcast is provided, it has the CA module, and electronic media, this CA module receives the received signal with scrambled broadcast information signal of sending from forwarding office, the scrambling key that uses regulation is scrambled broadcast information signal descrambling, this electronic media can be connected with this CA module with plugging, generate the scrambling key, and encrypt, send to the CA module, it is characterized in that, electronic media has: select control unit, it is according to the intrinsic sequence number of recipient that is stored in advance in this electronic media, be stored in the intrinsic sequence number of recipient in the CA module in advance, generate select signal, from the deciphering scrambling key holding unit of the scrambling key holding unit of electronic media and CA module, select the scrambling key respectively; Scrambling secret key encryption unit, it uses the scrambling key that encryption keys generated of regulation, and offers the CA module; Scrambling key holding unit, it stores the scrambling key that is generated, and keeps the scrambling key of specified quantity; With the encryption key arithmetic element, it is according to selecting signal, from scrambling key holding unit, obtain the scrambling key that is stored in the scrambling key holding unit, according to the scrambling key, calculate encryption key, the CA module has: the scrambling cipher key decryption unit, and it obtains encrypted scrambling key from electronic media, uses the decruption key of regulation to decipher this scrambling key; Deciphering scrambling key holding unit, it is stored in scrambling key decrypted in this scrambling cipher key decryption unit, and keeps the scrambling key of specified quantity; With the decruption key arithmetic element, it is obtained the scrambling key that is stored in the deciphering scrambling key holding unit, and according to the scrambling key, calculates decruption key according to selecting signal from deciphering scrambling key holding unit.
In addition, a kind of method of utilizing the digital broacast receiver receiving digital broadcast is provided, this digital broacast receiver receiving digital broadcast, and has a CA module, and electronic media, this CA module receives the received signal with scrambled broadcast information signal of sending from forwarding office, the scrambling key that uses regulation is scrambled broadcast information signal descrambling, this electronic media can be connected with this CA module with plugging, generate the scrambling key, and encrypt, send to the CA module, this method is characterized in that, carries out following step in electronic media: the encryption key calculation step, from the scrambling key keeps buffer, obtain on this device, once receive be stored in when handling in the scrambling key maintenance buffer on once scrambling key, according to the scrambling key of last time, the encryption key of computing regulation; The scrambling key keeps step, stores the scrambling key that is generated, and keeps the scrambling key of specified quantity; With scrambling secret key encryption step, use encryption key, encrypt the scrambling key, and offer the CA module, in the CA module, carry out following step: the decruption key calculation step, from deciphering scrambling key keep obtaining the buffer on this device, once receive be stored in when handling in the deciphering scrambling key maintenance buffer on once scrambling key, according to the scrambling key of last time, calculate the decruption key of regulation; The scrambling key keeps step, is stored in scrambling key decrypted in the scrambling secret key decryption step, and keeps the scrambling key of specified quantity; With scrambling secret key decryption step, obtain encrypted scrambling key from electronic media, use this decruption key to decipher this scrambling key.
In addition, a kind of method of utilizing the digital broacast receiver receiving digital broadcast is provided, this digital broacast receiver receiving digital broadcast, and has a CA module, and electronic media, this CA module receives the received signal with scrambled broadcast information signal of sending from forwarding office, the scrambling key that uses regulation is scrambled broadcast information signal descrambling, this electronic media can be connected with this CA module with plugging, generate the scrambling key, and encrypt, send to the CA module, this method is characterized in that, in electronic media, carry out following step: select controlled step, according to the intrinsic sequence number of recipient that is stored in advance in this electronic media, be stored in the intrinsic sequence number of recipient in the CA module in advance, generate and select signal, keep selecting the scrambling key respectively the buffer from the scrambling key maintenance buffer of electronic media and the deciphering scrambling key of CA module; The encryption key calculation step is selected signal according to this, keeps obtaining the buffer scrambling key that is stored in the scrambling key maintenance buffer from the scrambling key, according to the scrambling key, calculates the encryption key of regulation; The scrambling key keeps step, stores the scrambling key that is generated, and keeps the scrambling key of specified quantity; With scrambling secret key encryption step, use encryption key, encrypt the scrambling key, and offer the CA module, carry out following step in the CA module: the decruption key calculation step according to selecting signal, keeps obtaining the buffer the above-mentioned scrambling key that is stored in the deciphering scrambling key maintenance buffer from deciphering scrambling key, according to the scrambling key, calculate the decruption key of regulation; Scrambling secret key decryption step obtains encrypted scrambling key from electronic media, uses decruption key to decipher this scrambling key; Keep step with the scrambling key, be stored in decrypted scrambling key in this scrambling secret key decryption step, and keep the scrambling key of specified quantity.
Description of drawings
Fig. 1 is the block diagram of an embodiment of expression digital broacast receiver of the present invention.
Fig. 2 is the block diagram of other embodiment of expression digital broacast receiver of the present invention.
Among the figure: the 10-digital broacast receiver; The 20-CA module; The 22-TS split circuit; The 24-descrambling circuit; 26-deciphering scrambling key keeps buffer; 28-decruption key computing circuit; The 30-decrypt circuit; The 32-serial number register; The 40-IC card; The 42-cipher key register; The 44-EMM decrypt circuit; The 46-ECM decrypt circuit; 48-audiovisual decision circuit; 50-scrambling key keeps buffer; 52-encryption key computing circuit; The 54-encrypted circuit; The 56-serial number register; 58-selects control circuit.
Embodiment
Below, with reference to accompanying drawing, the embodiment of digital broacast receiver 10 of the present invention is elaborated.For example, the digital broacast receiver 10 of present embodiment, as shown in Figure 1, having CA module 20 and electronic media for example is IC (integrated circuit) card 40, this CA module has the basic receiving function of receiving digital broadcast, this electronic media can be connected with this CA module 20 with plugging, has the function of transmitting-receiving coded signal.In addition, for not having the part of direct relation, omit diagram, to avoid tediously long explanation with the understanding of the present invention.
The basic receiving function of receiving digital broadcast, be to comprise for example to receive the TS signal that sends from forwarding office, it is separated into broadcast information signal, EMM signal and ECM signal, EMM signal and ECM signal is sent to the function in IC-card 40 electronic media such as grade that are connected.
In the once reception of this device 10 is handled, receive the TS signal, generate the scrambling key according to EMM signal and ECM signal, broadcast information signal is carried out scramble process.
IC-card 40 comprises: cipher key register 42, EMM decrypt circuit 44, ECM decrypt circuit 46, audiovisual decision circuit 48, scrambling key keep buffer 50, encryption key computing circuit 52 and encrypted circuit 54.
The TS split circuit 22 of the CA module 20 of present embodiment, the TS signal 104 that reception is sent from forwarding office side (not shown), this TS signal 104 is separated into comprises by the scrambled broadcast information signal 106 of the video of scrambling and voice, EMM signal 108 and ECM signal 110, then, send to descrambling circuit 24, EMM decrypt circuit 44 and ECM decrypt circuit 46 respectively.
Descrambling circuit 24 use the regulation that is provided scrambling key 128, be to use the scrambling key 128 that provides from decrypt circuit 30 in the present embodiment, scrambled broadcast information signal 106 descramblings are become broadcast information signal 134 such as video and voice, and output.
Deciphering scrambling key keeps buffer 26 that decrypted scrambling key 128 in decrypt circuit 30 is temporarily kept, and as required it is offered decruption key computing circuit 28.In addition, deciphering scrambling key keeps buffer 26 can keep the scrambling key 128 of specified quantity, for example, in the processing that remains on current execution in decrypt circuit 30 the decrypted scrambling key 128, can also remain in the last processing decrypted scrambling key 128 in decrypt circuit 30.In addition, keep buffer 26, for example also can use first-in first-out (FIFO) mode as deciphering scrambling key.
Decruption key computing circuit 28, generates encryption key 132 thus, and it is offered decrypt circuit 30 keeping the output 130 of buffer 26 to carry out computing from deciphering scrambling key with the key generating mode identical with encryption key computing circuit 52.
The cipher key register 42 of IC-card 40 has that to store the IC-card 40 be used to decipher EMM signal 108 intrinsic, that is, the function of the master key 112 that the recipient is intrinsic, it provides master key 122 to EMM decrypt circuit 44.
The master key 112 that provides from cipher key register 42 is provided EMM decrypt circuit 44, the EMM signal 108 that sends from TS split circuit 22 is decrypted into the EMM information 116 that comprises working key 114 and CAMEL-Subscription-Information, and offers ECM decrypt circuit 46 and audiovisual decision circuit 48 respectively.
The working key 114 that provides from EMM decrypt circuit 44 is provided for ECM decrypt circuit 46, and the ECM signal 110 that the split circuit 22 from CA module 20 is sent is decrypted into the ECM information that comprises programme information, and offer audiovisual could decision circuit 48.
The scrambling key keeps buffer 50 that the scrambling key 120 that is generated by audiovisual decision circuit 48 is temporarily kept, and sends to encryption key computing circuit 52.In addition, the scrambling key keeps buffer 50 can temporarily keep the scrambling key 120 of specified quantity, for example, the scrambling key 120 that in remaining on the current processing of carrying out, generates, can also remain on the scrambling key 120 that generates by audiovisual decision circuit 48 in the last processing by audiovisual decision circuit 48.In addition, keep buffer 50, for example also can use the FIFO mode as the scrambling key.
Encryption key computing circuit 52 carries out computing to generate compute mode with decruption key computing circuit 28 identical keys to the scrambling key 122 that keeps buffer 50 to provide from the scrambling key, thus, generates encryption key 124, and it is offered encrypted circuit 54.
Below, the action the when recipient in the digital broacast receiver 10 of present embodiment has been installed IC-card 40 describes.
In the digital broacast receiver 10 of present embodiment, if recipient's IC-card 40 has been installed on the CA module 20, then, TS signal 104 by 20 receptions of CA module, be separated into scrambled broadcast information signal 106 and EMM signal 108, ECM signal 110 by TS split circuit 22, scrambled broadcast information signal 106 is sent to descrambling circuit 24, EMM signal 108 and ECM signal 110 are sent to ID card 40.
Send to the EMM signal 108 of IC-card 40, in EMM decrypt circuit 44, use the master key 112 that remains in advance in the cipher key register 42, be decrypted into the EMM information 116 that comprises CAMEL-Subscription-Information, ECM signal 110 is in ECM decrypt circuit 46, the working key 114 that use is comprised in EMM information 116 is decrypted into the ECM information 118 that comprises programme information.
EMM information 116 that these are decrypted and ECM information 118 etc. receive information, and being provided for audiovisual could decision circuit 48, and in audiovisual could decision circuit 48, by programme information and the CAMEL-Subscription-Information that comprises in the relatively reception information, judgement could audiovisual.
Be judged as can the situation of audiovisual under, generate scrambling key 120, and deliver to encrypted circuit 54.And, in the current processing of carrying out, scrambling key 120 is also delivered to the scrambling key keep buffer 50 in this wise, and, temporarily remain on the scrambling key and keep in the buffer 50 in order to calculate next encryption key 124.
In encrypted circuit 54, utilization is by encryption key computing circuit 52 bases encryption key 124 that the scrambling key keeps the scrambling key 122 in the buffer 50 to calculate that is maintained at by 48 generations of audiovisual decision circuit in last processing once, scrambling key 120 is encrypted to encryption scrambling key 126, and sends to CA module 20.
In the decrypt circuit 30 of CA module 20, utilization is by decruption key computing circuit 28 bases decruption key 132 that deciphering scrambling key keeps the scrambling key 130 in the buffer 26 to calculate that is maintained at by decrypt circuit 30 deciphering in last processing once, the encryption scrambling key 126 that sends from IC-card 40 is decrypted into scrambling key 128, and it is delivered to descrambling circuit 24.And, like this, in the current processing of carrying out, also scrambling key 128 is delivered to deciphering scrambling key and kept buffer 26, for the next decruption key 132 of computing, temporarily remain on deciphering scrambling key and keep in the buffer 26.
In addition, keep the identical key of scrambling key 128 in the buffer 26 owing to be maintained at deciphering scrambling key that the scrambling key of IC-card 40 keeps the scrambling key 120 in the buffer 50 and be maintained at CA module 20, and, the encryption key computing circuit 52 of IC-card 40 also adopts identical compute mode with the decruption key computing circuit 28 of CA module 20, so encryption key 124 is also identical certainly with decruption key 132.
By the scrambling key 128 of deciphering in decrypt circuit 30 is offered descrambling circuit 24, can be scrambled broadcast information signal 106 descramblings, make the recipient of regulation can the audiovisual video and broadcast information signal 134 such as voice.
Below, with reference to Fig. 2, the digital broacast receiver 60 of other embodiment of the present invention is described.Wherein,, give identical reference marks, and omit its explanation for the key element identical with Fig. 1.
Present embodiment carries out the management of scrambling key in addition, has further improved fail safe, and compares the embodiment of front, has appended new function.
IC-card 40 comprises cipher key register 42, EMM decrypt circuit 44, ECM decrypt circuit 46, audiovisual decision circuit 48, scrambling key maintenance buffer 50, encryption key computing circuit 52, encrypted circuit 54, data selection control circuit 58 and serial number register 56 and constitutes.
The serial number register 32 of CA module 20 has the function that stores the intrinsic sequence number 202 of recipient, in case IC-card 40 is connected with CA module 20, then sequence number 202 is sent in the selection control circuit 58 of IC-card 40.
The serial number register 56 of IC-card 40 in order to carry out checking of recipient, has the intrinsic function of checking sequence number 204 of the recipient of storage, in case IC-card 40 is connected with CA module 20, then offers selection control circuit 58 checking sequence number 204.
Select control circuit 58 to have the function of selecting control scrambling key 120 and scrambling key 128, it is according to sequence number 202 of sending from the serial number register 32 of CA module 20 and the serial number information 204 that provides from the serial number register 56 of IC-card 40, generate and select signal 206, and deliver to the deciphering scrambling key maintenance buffer 26 of CA module 20 and the scrambling key maintenance buffer 50 of IC-card 40.In the present embodiment, sequence number 202 and serial number information 204 are checked, if consistent, then output is used to select the selection signal 206 of the scrambling key that should use.In addition, also can will should select signal 206 to change output every the regular hour.
The scrambling key keeps buffer 50 that the scrambling key 120 that could decision circuit 48 from audiovisual continues to send here temporarily is saved in the quantity of regulation, delivering to encryption key computing circuit 52 according to selection signal 206 selected scrambling keys 122 that send from selection control circuit 58.
Deciphering scrambling key keeps buffer 26 the scrambling key 128 that continues to send here from decrypt circuit 30 temporarily to be saved in the quantity of regulation, and according to selecting a scrambling key 130, and deliver to decruption key computing circuit 28 from the selection signal 206 of selecting control circuit 58 to send.
For example, in the present embodiment, the scrambling key of IC-card 40 keeps buffer 50 to keep a plurality of scrambling keys, and maintain with the deciphering scrambling key that is maintained at CA module 20 and keep the identical scrambling key of a plurality of scrambling keys in the buffer 26, according to selecting signal 206 selected scrambling keys 122 also with identical according to selecting the selected scrambling key of signal 206 130.
Below, the action when the recipient has installed IC-card 40 in the digital broacast receiver of other embodiment of the present invention is described.In addition, owing to except the function of newly appending, carry out the action identical, so omit detailed explanation with the embodiment of front.
In the digital broacast receiver 60 of other embodiment, when recipient's IC-card 40 is installed in the CA module 20, be stored in the selection control circuit 58 that the intrinsic sequence number 202 of recipient in the serial number register 32 of CA module 20 is sent to IC-card 40 in advance.
In addition, in case IC-card 40 is connected with CA module 20, then for the checking of the recipient in the serial number register 56 that is stored in IC-card 40 in advance, the serial number information 204 of checking that the recipient is intrinsic offers and selects control circuit 58.
In selecting control circuit 58, the sequence number 202 of sending according to the serial number register 32 from CA module 20 and from the sequence number 204 that the serial number register 56 of IC-card 40 provides generates and selects signal 206.In the present embodiment, by selecting control circuit 58 to check sequence number 202 and sequence number 204, output is used to select the selection signal 206 of the scrambling key that will use.
The deciphering scrambling key of this selection signal 206 being delivered to simultaneously CA module 20 keeps the scrambling key of buffer 26 and IC-card 40 to keep buffer 50.
On the other hand, in digital broacast receiver 60, when recipient's IC-card 40 has been installed, same with the embodiment of front, TS signal 104 by 20 receptions of CA module, be separated into EMM signal 108 and ECM signal 110 by TS split circuit 22, and send to IC-card 40, after in IC-card 40, deciphering, in audiovisual could decision circuit 48, compare by programme information and the CAMEL-Subscription-Information that will be comprised in the reception information, judgement could audiovisual, generates scrambling key 120.
With the scrambling key 120 that is generated, deliver to encrypted circuit 54, and deliver to scrambling key maintenance buffer 50, and temporary transient the maintenance.
In addition, keep in buffer 50, also can temporarily remain to the scrambling key 120 that could decision circuit 48 from audiovisual continues to send here the quantity of regulation at this scrambling key.
Here, according to selection signal 206 from selecting control circuit 58 to send here, take out a scrambling key 122 in a plurality of scrambling keys 120 from be maintained at scrambling key maintenance buffer 50, carry out computing according to this scrambling key 122, output encryption key 124 by encryption key computing circuit 52.
To could decision circuit 48 deliver to the scrambling key 120 of encrypted circuit 54 from audiovisual, and utilize the encryption key of sending here from encryption key computing circuit 52 124 to encrypt, encryption scrambling key 126 will be sent to CA module 20.
The encryption scrambling key 126 that will send from IC-card 40 in the decrypt circuit 30 of CA module 20, utilizes the decruption key 132 that provides from decruption key computing circuit 28 to be decrypted into scrambling key 128, and delivers to descrambling circuit 24.In addition, like this, this scrambling key 128 is delivered to deciphering scrambling key keep buffer 26, and temporarily remain in the deciphering scrambling key maintenance buffer 26.
In addition, also can decipher the scrambling key and keep in the buffer 26, the scrambling key 128 that continues to send here from decrypt circuit 30 is temporarily remained to the quantity identical with the scrambling key maintenance buffer 50 of IC-card 40 at this.
Here, deciphering scrambling key in CA module 20 keeps in the buffer 26, receive the identical selection signal 206 that keeps buffer 50 with the scrambling key that is sent to IC-card 40 from the selection control circuit 58 of IC-card 40, take out a scrambling key 130 in a plurality of scrambling keys 128 from be maintained at deciphering scrambling key maintenance buffer 26, carry out computing by decruption key computing circuit 28 according to this scrambling key 130, output decruption key 132.
In addition, it is identical keys that the scrambling key that remains on IC-card 40 keeps a plurality of scrambling keys in the buffer 50 to keep a plurality of scrambling keys in the buffer 26 with the deciphering scrambling key that remains on CA module 20, utilizes the scrambling key 122 of selecting signal 206 to take out also identical with scrambling key 130.And the encryption key computing circuit 52 of IC-card 40 also adopts identical compute mode with the decruption key computing circuit 28 of CA module 20, so encryption key 124 is identical with decruption key 132.
By the scrambling key 128 of deciphering in decrypt circuit 30 is offered descrambling circuit 24, can be scrambled broadcast information signal 106 descramblings, make the recipient of regulation can the audiovisual video and broadcast information signal 134 such as voice.
Like this, according to the present invention, because the signal of transmitting-receiving is in encrypted state between CA module 20 and IC-card 40, even for example this signal is monitored, can not be in statu quo with the ciphered data descrambling, so, can prevent to make the not danger of data such as improper audiovisual video of qualified majority people and voice by improper acquisition scrambling key 120.
Claims (6)
1. digital broacast receiver, be used for receiving digital broadcast, it has CA module and electronic media, and this CA module receives the received signal with scrambled broadcast information signal of sending from forwarding office, and the scrambling key that uses regulation is above-mentioned scrambled broadcast information signal descrambling, this electronic media can be connected with this CA module with plugging, generate above-mentioned scrambling key, and encrypt, send to above-mentioned CA module, this digital broacast receiver is characterized in that
Above-mentioned electronic media has:
Scrambling secret key encryption unit, it uses the encryption key of regulation to encrypt the above-mentioned scrambling key that is generated, and offers above-mentioned CA module;
Scrambling key holding unit, it stores the above-mentioned scrambling key that is generated, and keeps the scrambling key of specified quantity; With
The encryption key arithmetic element, its from above-mentioned scrambling key holding unit, obtain on this device once receive be stored in when handling in the above-mentioned scrambling key holding unit on once above-mentioned scrambling key, and, calculate above-mentioned encryption key according to the scrambling key of above-mentioned last time
Above-mentioned CA module has:
The scrambling cipher key decryption unit, it obtains encrypted above-mentioned scrambling key from above-mentioned electronic media, uses the decruption key of regulation to decipher this scrambling key;
Deciphering scrambling key holding unit, it is stored in above-mentioned scrambling key decrypted in this scrambling cipher key decryption unit, and keeps the decrypted above-mentioned scrambling key of specified quantity; With
The decruption key arithmetic element, its from above-mentioned deciphering scrambling key holding unit, obtain on this device once receive be stored in when handling in the above-mentioned deciphering scrambling key holding unit on once above-mentioned scrambling key, and, calculate above-mentioned decruption key according to the scrambling key of above-mentioned last time.
2. digital broacast receiver, be used for receiving digital broadcast, it has CA module and electronic media, and this CA module receives the received signal with scrambled broadcast information signal of sending from forwarding office, and the scrambling key that uses regulation is above-mentioned scrambled broadcast information signal descrambling, this electronic media can be connected with this CA module with plugging, generate above-mentioned scrambling key, and encrypt, send to above-mentioned CA module, this digital broacast receiver is characterized in that
Above-mentioned electronic media has:
Select control unit, it is according to being stored in the intrinsic sequence number of recipient in this electronic media in advance and being stored in the intrinsic sequence number of recipient in the above-mentioned CA module in advance, generate to select signal, from the deciphering scrambling key holding unit of the scrambling key holding unit of above-mentioned electronic media and above-mentioned CA module, select the scrambling key respectively;
Scrambling secret key encryption unit, it uses the above-mentioned scrambling key that encryption keys generated of regulation, and offers above-mentioned CA module;
Scrambling key holding unit, it stores the above-mentioned scrambling key that is generated, and keeps the scrambling key of specified quantity; With
The encryption key arithmetic element, it obtains the above-mentioned scrambling key that is stored in the above-mentioned scrambling key holding unit according to above-mentioned selection signal from above-mentioned scrambling key holding unit, according to above-mentioned scrambling key, calculate above-mentioned encryption key,
Above-mentioned CA module has:
The scrambling cipher key decryption unit, it obtains encrypted above-mentioned scrambling key from above-mentioned electronic media, uses the decruption key of regulation to decipher this scrambling key;
Deciphering scrambling key holding unit, it is stored in scrambling key decrypted in this scrambling cipher key decryption unit, and keeps the scrambling key of specified quantity; With
The decruption key arithmetic element, it obtains the above-mentioned scrambling key that is stored in the above-mentioned deciphering scrambling key holding unit according to above-mentioned selection signal from above-mentioned deciphering scrambling key holding unit, according to above-mentioned scrambling key, calculate above-mentioned decruption key.
3. digital broacast receiver according to claim 1 and 2 is characterized in that,
Above-mentioned CA module is made of semiconductor integrated circuit,
Above-mentioned electronic media is made of semiconductor integrated circuit.
4. digital broadcast receiving method, it is the method for utilizing the digital broacast receiver receiving digital broadcast, this digital broacast receiver receiving digital broadcast, have CA module and electronic media, this CA module receives the received signal with scrambled broadcast information signal of sending from forwarding office, the scrambling key that uses regulation is above-mentioned scrambled broadcast information signal descrambling, this electronic media can be connected with this CA module with plugging, generate above-mentioned scrambling key, and encrypt, send to above-mentioned CA module, this method is characterized in that
In above-mentioned electronic media, carry out following step:
The encryption key calculation step, from above-mentioned scrambling key keep obtaining the buffer on this device, once receive be stored in when handling in the scrambling key maintenance buffer on once above-mentioned scrambling key, according to the scrambling key of above-mentioned last time, the encryption key of computing regulation;
The scrambling key keeps step, stores the above-mentioned scrambling key that is generated, and keeps the scrambling key of specified quantity; With
Scrambling secret key encryption step is used above-mentioned encryption key, encrypts above-mentioned scrambling key, and offers above-mentioned CA module,
In above-mentioned CA module, carry out following step:
The decruption key calculation step, from above-mentioned deciphering scrambling key keep obtaining the buffer on this device, once receive be stored in when handling in the deciphering scrambling key maintenance buffer on once above-mentioned scrambling key, according to the scrambling key of above-mentioned last time, calculate the decruption key of regulation;
The scrambling key keeps step, is stored in above-mentioned scrambling key decrypted in this scrambling secret key decryption step, and keeps the scrambling key of specified quantity; With
Scrambling secret key decryption step obtains encrypted above-mentioned scrambling key from above-mentioned electronic media, uses above-mentioned decruption key to decipher this scrambling key.
5. digital broadcast receiving method, it is the method for utilizing the digital broacast receiver receiving digital broadcast, this digital broacast receiver receiving digital broadcast, have CA module and electronic media, this CA module receives the received signal with scrambled broadcast information signal of sending from forwarding office, the scrambling key that uses regulation is above-mentioned scrambled broadcast information signal descrambling, this electronic media can be connected with this CA module with plugging, generate above-mentioned scrambling key, and encrypt, send to above-mentioned CA module, this method is characterized in that
In above-mentioned electronic media, carry out following step:
Select controlled step, according to being stored in the intrinsic sequence number of recipient in this electronic media in advance and being stored in the intrinsic sequence number of recipient in the above-mentioned CA module in advance, generate and select signal, keep selecting above-mentioned scrambling key respectively the buffer from the scrambling key maintenance buffer of above-mentioned electronic media and the deciphering scrambling key of above-mentioned CA module;
The encryption key calculation step according to above-mentioned selection signal, keeps obtaining the buffer the above-mentioned scrambling key that is stored in the above-mentioned scrambling key maintenance buffer from above-mentioned scrambling key, according to above-mentioned scrambling key, calculates the encryption key of regulation;
The scrambling key keeps step, stores the above-mentioned scrambling key that is generated, and keeps the scrambling key of specified quantity; With
Scrambling secret key encryption step is used above-mentioned encryption key, encrypts above-mentioned scrambling key, and offers above-mentioned CA module,
In above-mentioned CA module, carry out following step:
The decruption key calculation step according to above-mentioned selection signal, keeps obtaining the buffer the above-mentioned scrambling key that is stored in the above-mentioned deciphering scrambling key maintenance buffer from above-mentioned deciphering scrambling key, according to above-mentioned scrambling key, calculates the decruption key of regulation;
Scrambling secret key decryption step obtains encrypted above-mentioned scrambling key from above-mentioned electronic media, uses above-mentioned decruption key to decipher this scrambling key; With
The scrambling key keeps step, is stored in above-mentioned scrambling key decrypted in this scrambling secret key decryption step, and keeps the scrambling key of specified quantity.
6. according to claim 4 or 5 described digital broadcast receiving methods, this method is characterized in that,
In above-mentioned electronic media, carry out following step: select the signal forwarding step, this step output is used in the above-mentioned selection signal of the above-mentioned selection signal variation of selecting above-mentioned scrambling key by certain hour, and sends to the above-mentioned scrambling key maintenance buffer that above-mentioned scrambling key keeps buffer and above-mentioned CA module.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007258811A JP4379895B2 (en) | 2007-10-02 | 2007-10-02 | Digital broadcast receiving apparatus and method |
| JP2007258811 | 2007-10-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101404751A true CN101404751A (en) | 2009-04-08 |
Family
ID=40538600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101320410A Pending CN101404751A (en) | 2007-10-02 | 2008-07-18 | Digital broadcast receiving device and method |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4379895B2 (en) |
| CN (1) | CN101404751A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105873048A (en) * | 2015-11-16 | 2016-08-17 | 乐视致新电子科技（天津）有限公司 | Wireless access control method and device, and router |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2219374A1 (en) * | 2009-02-13 | 2010-08-18 | Irdeto Access B.V. | Securely providing a control word from a smartcard to a conditional access module |
-
2007
- 2007-10-02 JP JP2007258811A patent/JP4379895B2/en not_active Expired - Fee Related
-
2008
- 2008-07-18 CN CNA2008101320410A patent/CN101404751A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105873048A (en) * | 2015-11-16 | 2016-08-17 | 乐视致新电子科技（天津）有限公司 | Wireless access control method and device, and router |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4379895B2 (en) | 2009-12-09 |
| JP2009089243A (en) | 2009-04-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10057641B2 (en) | Method to upgrade content encryption | |
| EP1486069B1 (en) | Content playback apparatus, method, and program, and key management apparatus and system | |
| US8548167B2 (en) | System for traceable decryption of bandwidth-efficient broadcast of encrypted messages and security module revocation method used for securing broadcasted messages | |
| CN100366083C (en) | Method for operating conditional access system for broadcast applications | |
| EP2461534A1 (en) | Control word protection | |
| CN101827246A (en) | Provide control word from smart card to the access modules safety of having ready conditions | |
| CN101282456B (en) | Method and apparatus for receiving digital television condition | |
| CN105409234A (en) | Systems and methods for performing transport I/O | |
| US20130046969A1 (en) | Methods for decrypting, transmitting and receiving control words, recording medium and control word server to implement these methods | |
| US20120290831A1 (en) | Methods for decrypting, transmitting and receiving control words, storage medium and server for said methods | |
| CN101132408B (en) | Stream media content processing method, equipment and system | |
| CN101626484A (en) | Method for protecting control word in condition access system, front end and terminal | |
| CN101404751A (en) | Digital broadcast receiving device and method | |
| JPH0550172B2 (en) | ||
| JP2008294707A (en) | Digital broadcast receiving apparatus | |
| CN101316146A (en) | Digital broadcast receiver and digital broadcast receiving method | |
| GB2377348A (en) | Security unit for encrypted signal transmission | |
| CN103402129A (en) | Condition receiving method, condition receiving equipment and condition receiving system | |
| CN101998163A (en) | Entitlement management method, terminal equipment and front end | |
| JP2004088279A (en) | Broadcast transmission method and receiver | |
| JP2008017502A (en) | Processing apparatus in conditional access system | |
| CN106550255B (en) | Television far-end encryption method and system | |
| JP2007036380A (en) | Receiver, cas module and distribution method | |
| JP2005191847A (en) | Broadcast equipment and receiver | |
| JP5200892B2 (en) | Information processing apparatus, information processing method, receiving apparatus, receiving method, program, and receiving system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20090408 |