CN113569220A

CN113569220A - CAM card automatic identification method, identification device and display equipment

Info

Publication number: CN113569220A
Application number: CN202110932422.2A
Authority: CN
Inventors: 樊祥
Original assignee: Hisense Electronic Technology Shenzhen Co ltd
Current assignee: Vidaa Netherlands International Holdings BV
Priority date: 2021-08-13
Filing date: 2021-08-13
Publication date: 2021-10-29

Abstract

The embodiment provides an automatic CAM card identification method, an identification device and a display device. And then, sending the corresponding first verification data to the CAM card according to the type of the CAM card to generate a first key. Meanwhile, the display equipment receives second check data sent by the CAM card, generates a second key and sends the second key to the CAM card. After the key exchange process is completed, the CAM card judges whether the first key and the second key are the same, and if the first key and the second key are the same, the CAM card is determined to be successfully authenticated. In this embodiment, after different types of CAM cards are identified according to different content control system identifiers, a corresponding key exchange process is performed according to the type of the CAM card, thereby completing authentication of the CAM card. Therefore, no matter what type of CAM card is inserted by a user, automatic identification can be carried out, finally, the media assets of any type of CAM card can be played, and the use experience of the user is improved.

Description

CAM card automatic identification method, identification device and display equipment

Technical Field

The present application relates to the field of display device technologies, and in particular, to a method and an apparatus for automatically identifying a CAM card, and a display device.

Background

The CAM (Conditional Access Module), also called Conditional Access card or CAM card, is mainly used to control the user's right to watch authorized digital tv programs. In the intelligent television system, the CAM card can enable a digital television operator to perform authorization control and authorization management on a user, so that paid services of digital television programs are realized.

Currently, there are two types of CAM cards on the market, one is a standard CAM card, and the other is an ECP CAM (Enhanced Content Protection Conditional Access Module) card. According to the iteration of the technology, the standard CAM card will be gradually replaced by the ECP CAM card, and the standard CAM card will become a transitional product.

However, in the product transition phase, most televisions still support only the identification of standard CAM cards, and few televisions support the identification of ECP CAM cards. Therefore, for a television which only supports one type of CAM card identification, programs of the other type of CAM card cannot be watched, and the user experience is poor.

Disclosure of Invention

The application provides a CAM card automatic identification method, a CAM card automatic identification device and a CAM card display device, which are used for solving the problem that a television only supporting identification of one type of CAM card cannot watch programs of the other type of CAM card, so that user experience is poor.

In a first aspect, the present embodiment provides a method for automatically identifying a CAM card, which is applied to a display device, including,

receiving a content data control request sent by a CAM card inserted into the display equipment, wherein the content data control request carries a content control system identifier;

determining the type of the CAM card according to the content control system identifier, and sending first verification data corresponding to the type of the CAM card to the CAM card so that a first key is generated after the CMA card verifies the first verification data;

receiving second check data sent by the CAM card, generating a second key after checking the second check data, and sending the second key to the CAM card so that the CAM card compares the first key with the second key, wherein when the first key is the same as the second key, the CAM card is determined to be successfully authenticated.

In a second aspect, the present embodiment provides an automatic CAM card identification device, including:

a request receiving unit configured to perform: receiving a content data control request sent by a CAM card inserted into the display equipment, wherein the content data control request carries a content control system identifier;

a first check data transmission unit configured to perform: determining the type of the CAM card according to the content control system identifier, and sending first verification data corresponding to the type of the CAM card to the CAM card so that a first key is generated after the CAM card verifies the first verification data;

a second key generation unit for performing: receiving second check data sent by the CAM card, generating a second key after checking the second check data, and sending the second key to the CAM card so that the CAM card compares the first key with the second key, wherein when the first key is the same as the second key, the CAM card is determined to be successfully authenticated.

In a third aspect, the present embodiment provides a display device including the CAM card automatic identification apparatus of the second aspect.

In the method and the apparatus for automatically identifying a CAM card according to this embodiment, after the CAM card is inserted into a display device, a content data control request is first received from the CAM card, where the content data control request carries a content control system identifier, and therefore, a type of the CAM card may be determined according to the content control system identifier. And then, sending the corresponding first verification data to the CAM card according to the type of the CAM card so that the CAM card verifies the first verification data to generate a first key. Meanwhile, the display equipment receives second check data sent by the CAM card, generates a second key after checking the second check data, and sends the second key to the CAM card. After the key exchange process is completed, the CAM card judges whether the first key and the second key are the same, and if the first key and the second key are the same, the CAM card is determined to be successfully authenticated. In this embodiment, after different types of CAM cards are identified according to different content control system identifiers, a corresponding key exchange process is performed according to the type of the CAM card, thereby completing authentication of the CAM card. Therefore, no matter what type of CAM card is inserted by a user, automatic identification can be carried out, finally, the media assets of any type of CAM card can be played, and the use experience of the user is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 illustrates a usage scenario of a display device according to some embodiments;

fig. 2 illustrates a hardware configuration block diagram of the control apparatus 100 according to some embodiments;

fig. 3 illustrates a hardware configuration block diagram of the display apparatus 200 according to some embodiments;

FIG. 4 illustrates a software configuration diagram in the display device 200 according to some embodiments;

FIG. 5 illustrates a signaling diagram of a CAM card auto-id method according to some embodiments;

fig. 6 illustrates a block diagram of a CAM card auto-id device according to some embodiments.

Detailed Description

To make the purpose and embodiments of the present application clearer, the following will clearly and completely describe the exemplary embodiments of the present application with reference to the attached drawings in the exemplary embodiments of the present application, and it is obvious that the described exemplary embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

It should be noted that the brief descriptions of the terms in the present application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of the present application. These terms should be understood in their ordinary and customary meaning unless otherwise indicated.

The terms "first," "second," "third," and the like in the description and claims of this application and in the above-described drawings are used for distinguishing between similar or analogous objects or entities and not necessarily for describing a particular sequential or chronological order, unless otherwise indicated. It is to be understood that the terms so used are interchangeable under appropriate circumstances.

The terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of elements is not necessarily limited to all elements expressly listed, but may include other elements not expressly listed or inherent to such product or apparatus.

The term "module" refers to any known or later developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware or/and software code that is capable of performing the functionality associated with that element.

Fig. 1 is a schematic diagram of a usage scenario of a display device according to an embodiment. As shown in fig. 1, the display apparatus 200 is also in data communication with a server 400, and a user can operate the display apparatus 200 through the smart device 300 or the control device 100.

In some embodiments, the control apparatus 100 may be a remote controller, and the communication between the remote controller and the display device includes at least one of an infrared protocol communication or a bluetooth protocol communication, and other short-distance communication methods, and controls the display device 200 in a wireless or wired manner. The user may control the display apparatus 200 by inputting a user instruction through at least one of a key on a remote controller, a voice input, a control panel input, and the like.

In some embodiments, the smart device 300 may include any of a mobile terminal 300A, a tablet, a computer, a laptop, an AR/VR device, and the like.

In some embodiments, the smart device 300 may also be used to control the display device 200. For example, the display device 200 is controlled using an application program running on the smart device.

In some embodiments, the smart device 300 and the display device may also be used for communication of data.

In some embodiments, the display device 200 may also be controlled in a manner other than the control apparatus 100 and the smart device 300, for example, the voice instruction control of the user may be directly received by a module configured inside the display device 200 to obtain a voice instruction, or may be received by a voice control apparatus provided outside the display device 200.

In some embodiments, the display device 200 is also in data communication with a server 400. The display device 200 may be allowed to be communicatively connected through a Local Area Network (LAN), a Wireless Local Area Network (WLAN), and other networks. The server 400 may provide various contents and interactions to the display apparatus 200. The server 400 may be a cluster or a plurality of clusters, and may include one or more types of servers.

In some embodiments, software steps executed by one step execution agent may be migrated on demand to another step execution agent in data communication therewith for execution. Illustratively, software steps performed by the server may be migrated to be performed on a display device in data communication therewith, and vice versa, as desired.

Fig. 2 exemplarily shows a block diagram of a configuration of the control apparatus 100 according to an exemplary embodiment. As shown in fig. 2, the control device 100 includes a controller 110, a communication interface 130, a user input/output interface 140, a memory, and a power supply. The control apparatus 100 may receive an input operation instruction from a user and convert the operation instruction into an instruction recognizable and responsive by the display device 200, serving as an interaction intermediary between the user and the display device 200.

Fig. 3 shows a hardware configuration block diagram of the display apparatus 200 according to an exemplary embodiment.

In some embodiments, the display apparatus 200 includes at least one of a tuner demodulator 210, a communicator 220, a detector 230, an external device interface 240, a controller 250, a display 260, an audio output interface 270, a memory, a power supply, a user interface.

In some embodiments the controller comprises a central processor, a video processor, an audio processor, a graphics processor, a RAM, a ROM, a first interface to an nth interface for input/output.

In some embodiments, the display 260 includes a display screen component for displaying pictures, and a driving component for driving image display, a component for receiving image signals from the controller output, displaying video content, image content, and menu manipulation interface, and a user manipulation UI interface, etc.

In some embodiments, the display 260 may be at least one of a liquid crystal display, an OLED display, and a projection display, and may also be a projection device and a projection screen.

In some embodiments, the tuner demodulator 210 receives broadcast television signals via wired or wireless reception, and demodulates audio/video signals, such as EPG data signals, from a plurality of wireless or wired broadcast television signals.

In some embodiments, communicator 220 is a component for communicating with external devices or servers according to various communication protocol types. For example: the communicator may include at least one of a Wifi module, a bluetooth module, a wired ethernet module, and other network communication protocol chips or near field communication protocol chips, and an infrared receiver. The display apparatus 200 may establish transmission and reception of control signals and data signals with the control device 100 or the server 400 through the communicator 220.

In some embodiments, the detector 230 is used to collect signals of the external environment or interaction with the outside. For example, detector 230 includes a light receiver, a sensor for collecting ambient light intensity; alternatively, the detector 230 includes an image collector, such as a camera, which may be used to collect external environment scenes, attributes of the user, or user interaction gestures, or the detector 230 includes a sound collector, such as a microphone, which is used to receive external sounds.

In some embodiments, the external device interface 240 may include, but is not limited to, the following: high Definition Multimedia Interface (HDMI), analog or data high definition component input interface (component), composite video input interface (CVBS), USB input interface (USB), RGB port, and the like. The interface may be a composite input/output interface formed by the plurality of interfaces.

In some embodiments, the controller 250 and the modem 210 may be located in different separate devices, that is, the modem 210 may also be located in an external device of the main device where the controller 250 is located, such as an external set-top box.

In some embodiments, the controller 250 controls the operation of the display device and responds to user operations through various software control programs stored in memory. The controller 250 controls the overall operation of the display apparatus 200. For example: in response to receiving a user command for selecting a UI object to be displayed on the display 260, the controller 250 may perform an operation related to the object selected by the user command.

In some embodiments, the object may be any one of selectable objects, such as a hyperlink, an icon, or other actionable control. The operations related to the selected object are: displaying an operation connected to a hyperlink page, document, image, or the like, or performing an operation of a program corresponding to the icon.

In some embodiments the controller comprises at least one of a Central Processing Unit (CPU), a video processor, an audio processor, a Graphics Processing Unit (GPU), a RAM Random Access Memory (RAM), a ROM (Read-Only Memory), a first to nth interface for input/output, a communication Bus (Bus), and the like.

A CPU processor. For executing operating system and application program instructions stored in the memory, and executing various application programs, data and contents according to various interactive instructions receiving external input, so as to finally display and play various audio-video contents. The CPU processor may include a plurality of processors. E.g. comprising a main processor and one or more sub-processors.

In some embodiments, a graphics processor for generating various graphics objects, such as: at least one of an icon, an operation menu, and a user input instruction display figure. The graphic processor comprises an arithmetic unit, which performs operation by receiving various interactive instructions input by a user and displays various objects according to display attributes; the system also comprises a renderer for rendering various objects obtained based on the arithmetic unit, wherein the rendered objects are used for being displayed on a display.

In some embodiments, the video processor is configured to receive an external video signal, and perform at least one of video processing such as decompression, decoding, scaling, noise reduction, frame rate conversion, resolution conversion, and image synthesis according to a standard codec protocol of the input signal, so as to obtain a signal displayed or played on the direct display device 200.

In some embodiments, a user may enter user commands on a Graphical User Interface (GUI) displayed on display 260, and the user input interface receives the user input commands through the Graphical User Interface (GUI). Alternatively, the user may input the user command by inputting a specific sound or gesture, and the user input interface receives the user input command by recognizing the sound or gesture through the sensor.

In some embodiments, a "user interface" is a media interface for interaction and information exchange between an application or operating system and a user that enables conversion between an internal form of information and a form that is acceptable to the user. A commonly used presentation form of the User Interface is a Graphical User Interface (GUI), which refers to a User Interface related to computer operations and displayed in a graphical manner. It may be an interface element such as an icon, a window, a control, etc. displayed in the display screen of the electronic device, where the control may include a visual interface element such as an icon, a button, a menu, a tab, a text box, a dialog box, a status bar, a navigation bar, a Widget, etc.

In some embodiments, a system of a display device may include a Kernel (Kernel), a command parser (shell), a file system, and an application program. The kernel, shell, and file system together make up the basic operating system structure that allows users to manage files, run programs, and use the system. After power-on, the kernel is started, kernel space is activated, hardware is abstracted, hardware parameters are initialized, and virtual memory, a scheduler, signals and interprocess communication (IPC) are operated and maintained. And after the kernel is started, loading the Shell and the user application program. The application program is compiled into machine code after being started, and a process is formed.

As shown in fig. 4, the system of the display device may include a Kernel (Kernel), a command parser (shell), a file system, and an application program. The kernel, shell, and file system together make up the basic operating system structure that allows users to manage files, run programs, and use the system. After power-on, the kernel is started, kernel space is activated, hardware is abstracted, hardware parameters are initialized, and virtual memory, a scheduler, signals and interprocess communication (IPC) are operated and maintained. And after the kernel is started, loading the Shell and the user application program. The application program is compiled into machine code after being started, and a process is formed.

As shown in fig. 4, the system of the display device is divided into three layers, i.e., an application layer, a middleware layer and a hardware layer from top to bottom. The Application layer mainly includes common applications on the television and an Application Framework (Application Framework), wherein the common applications are mainly applications developed based on the Browser, such as: HTML5 APPs; and Native APPs (Native APPs);

an Application Framework (Application Framework) is a complete program model, and has all basic functions required by standard Application software, such as: file access, data exchange, and interfaces to use these functions (toolbars, status lists, menus, dialog boxes).

Native APPs (Native APPs) may support online or offline, message push, or local resource access.

The middleware layer comprises various television protocols, multimedia protocols, system components and other middleware. The middleware can use basic service (function) provided by system software to connect each part of an application system or different applications on a network, and can achieve the purposes of resource sharing and function sharing.

The hardware layer mainly comprises an HAL interface, hardware and a driver, wherein the HAL interface is a unified interface for butting all the television chips, and specific logic is realized by each chip. The driving mainly comprises: audio drive, display driver, bluetooth drive, camera drive, WIFI drive, USB drive, HDMI drive, sensor drive (like fingerprint sensor, temperature sensor, pressure sensor etc.) and power drive etc..

In order to solve the above problems, the present application provides a display device that can automatically recognize the type of a CAM card and authenticate the CAM card according to the type of the CAM card. Therefore, no matter what type of CAM card is inserted into the display equipment by the user, automatic identification can be carried out, and finally the media assets of any type of CAM card can be played.

The process of the display device for automatically identifying the CAM card comprises two parts:

the first is the identification of the type of CAM card. After the user inserts the CAM card into the display device, the CAM card actively initiates a session request and establishes a session with the display device. The CAM card then transmits CC _ DATA _ REQ (content DATA control request) to the display device. The content data control request carries a CC System ID (content control System identification). The content control system identification uniquely identifies the content protection system supported by the CAM card.

Specifically, when the CC System ID is 1, it may be determined that the type of the CAM card is a standard CAM card; when the CC System ID is more than or equal to 2, the type of the CAM card can be determined to be an ECP CAM card.

The second is the process of authenticating the CAM card. The display equipment sends first verification data corresponding to the type of the CAM card to the CAM card, and the CAM card generates a first secret key after verifying the first verification data. Meanwhile, the display equipment receives second check data sent by the CAM card, generates a second key after checking the second check data, and sends the second key to the CAM card. And if the first key and the second key are the same, determining that the CAM card authentication is successful, namely, finishing the CAM card authentication. And if the first key and the second key are not the same, determining that the CAM card fails to authenticate. It should be noted that, the comparison process between the first key and the second key is performed by the CAM card. It should be noted that, if the CAM card is successfully authenticated, the CAM card is required to send the program content to the display device for displaying, so that the user can know the program content.

Through the steps, no matter what type of CAM card is inserted by the user, automatic identification can be carried out, finally, the media assets of any type of CAM card can be played, and the user experience is improved. It should be noted that the CAM card is mainly used to protect the output content, and the CAM card not only can decrypt the encrypted content, but also can determine which programs can be played, which programs cannot be played, which programs are authorized to be recorded, and which contents are not authorized to be recorded according to the purchased program authorization. Therefore, even if the CAM card authentication is successful, there may be a case where some programs cannot be played.

Specifically, after the display device knows the type of the current CAM card, the data encryption algorithm supported by the current CAM card can be acquired at the same time. The data encryption algorithms supported by standard CAM cards and ECP CAM cards are not the same. For example, a standard CAM card supports only SHA128 (hash algorithm 128), while an ECP CAM card may simultaneously support SHA256 (hash algorithm 256). Further, the data encryption algorithm used by the current display device is determined according to the capability parameter of the display device and the data encryption algorithm supported by the CAM card.

If the capability parameter of the current display device is to support the hash algorithm 128, the data encryption algorithm used by the current display device is the hash algorithm 128 regardless of whether the type of the current CAM card is a standard CAM card or an ECP CAM card. If the capability parameter of the current display device is 256 for supporting the hash algorithm and the type of the current CAM card is a standard CAM card, the data encryption algorithm used by the current display device is the hash algorithm 128. If the capability parameter of the current display device is that the hash algorithm 256 is supported and the type of the current CAM card is an ECP CAM card, the data encryption algorithm used by the current display device is the hash algorithm 256.

The display device communicates with the CAM card to confirm the identity, i.e., authentication of the CAM card. This process relies primarily on CI + KEY (KEY certificate) where KEY certificates include root certificates, brand certificates (brand authorization certificates), and device KEYs (device KEYs), with different CAM cards utilizing different KEY certificates. In the embodiment of the application, two types of key certificates, namely a first generation key certificate and a second generation key certificate, are burned in a secure storage area of display equipment in advance. The hash algorithm 128 employs a first generation key certificate and the hash algorithm 256 employs a second generation key certificate.

After determining the type of CAM card currently inserted into the display device, the display device reads the key certificate from the secure storage area. And then generating signature verification data according to the unique equipment identification of the display equipment by using a corresponding data encryption algorithm. The display device sends the key certificate data and the signature verification data to the CAM card. After the CAM card receives the key certificate data and the signature verification data, the CAM card verifies the data and generates a first key.

Meanwhile, the CAM card sends the stored root certificate data and signature data generated according to the unique identification of the CAM card to the display device. And after the display equipment receives the root certificate data and the signature data of the CAM card, verifying the data and generating a second key. And finally, the display device is matched with the first key and the second key, and if the first key and the second key are the same, the authentication of the CAM card is completed. The standard CAM card stores a first generation key certificate, and the ECP CAM card stores a first generation key certificate and a second generation key certificate.

Specifically, if it is determined that the type of the CAM card currently inserted into the display device is a standard CAM card, the display device reads 1st CI + KEY (first-generation KEY certificate data) from the secure storage area. And generating signature verification data from the unique device identification of the display device using a hash algorithm 128. And then, the first generation key certificate data and the signature verification data are sent to the CAM card, and the CAM card verifies the data to generate a first key. It should be noted that, if it is determined that the type of the CAM card currently inserted into the display device is a standard CAM card, the display device also checks the data acquired from the CAM card according to the hash algorithm 128.

If it is determined that the type of the CAM card currently inserted into the display device is an ECP CAM card, the display device reads 2nd CI + KEY (second generation KEY certificate data) from the secure storage area. And generating signature verification data according to the unique device identification of the display device by using a hash algorithm 256 (wherein the capability parameter of the current display device is also the support hash algorithm 256). And then, sending the second generation key certificate data and the signature verification data to the CAM card, and verifying the data by the CAM card to generate a first key. It should be noted that, if it is determined that the type of the CAM card currently inserted into the display device is the ECP CAM card, the display device also checks the data acquired from the CAM card according to the hash algorithm 256.

Therefore, no matter what type of CAM card is inserted into the display device, different signature verification algorithms are supported in the authentication and identification process, and key exchange in the authentication process can be carried out, so that authentication is completed, and automatic identification of the standard CAM card and the ECP CAM card is realized.

And after the automatic identification is successful, the CAM card transmits a content-controlled media asset decryption key to the display device. And after receiving the media asset decryption key, the display equipment sends the media asset decryption key to the descrambler, and the descrambler decrypts the encrypted media asset according to the media asset decryption key so as to realize the playing operation of the encrypted media asset on the display equipment.

An embodiment of the present application provides an automatic CAM card identification method, such as a signaling diagram of the automatic CAM card identification method shown in fig. 6, where the method includes the following steps:

step one, after the CAM card is inserted into the display equipment, the CAM card sends a content data control request to the display equipment, wherein the content data control request carries a content control system identifier.

And step two, determining the type of the CAM card according to the content control system identification. And sending the first verification data corresponding to the type of the CAM card to the CAM card so that the CAM card generates a first key after verifying the first verification data.

And step three, after receiving the second check data sent by the CAM card, the display equipment generates a second key and sends the second key to the CAM card.

And step four, the CAM card judges whether the first key and the second key are the same, and if the first key and the second key are the same, the CAM card is determined to be successfully authenticated.

In some embodiments, the method further comprises: determining a data encryption algorithm according to the capacity parameter of the display device and the type of the CAM card, wherein the first verification data comprises first key certificate data and first signature verification data, the first key certificate data is data acquired from a secure storage area of the display device according to the type of the CAM card, and the first signature verification data is data generated according to the identifier of the display device by using the data encryption algorithm corresponding to the type of the CAM card;

the second verification data comprises second key certificate data and second signature verification data, wherein the second key certificate data is data stored in the CAM card, and the second signature verification data is data generated according to the identification of the CAM card by using a data encryption algorithm corresponding to the type of the CAM card.

When the type of the CAM card is a standard CAM card, the data encryption algorithm is a hash algorithm 128; when the type of the CAM card is an ECP CAM card, the data encryption algorithm is a hash algorithm 256.

When the type of the CAM card is a standard CAM card, the first key certificate data is first generation key certificate data; and when the type of the CAM card is an ECP CAM card, the first key certificate data is second generation key certificate data.

Based on the foregoing embodiments, an embodiment of the present application further provides an automatic CAM card identification device, as shown in a frame diagram of the automatic CAM card identification device shown in fig. 6, the device includes:

a request receiving unit configured to perform: receiving a content data control request sent by a CAM card inserted into display equipment, wherein the content data control request carries a content control system identifier;

a first check data transmission unit configured to perform: determining the type of the CAM card according to the content control system identifier, and sending first verification data to the CAM card according to the type of the CAM card so that a first key is generated after the CMA card verifies the first verification data;

a second key generation unit for performing: receiving second check data sent by the CAM card, generating a second secret key after checking the second check data, and sending the second secret key to the CAM card so that the CAM card compares the first secret key with the second secret key, wherein when the first secret key is the same as the second secret key, the CAM card is determined to be successfully authenticated.

The same or similar contents in the embodiments of the present application may be referred to each other, and the related embodiments are not described in detail.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

The foregoing description, for purposes of explanation, has been presented in conjunction with specific embodiments. However, the illustrative discussions above are not intended to be exhaustive or to limit the embodiments to the precise forms disclosed above. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles and the practical application, to thereby enable others skilled in the art to best utilize the embodiments and various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. A CAM card automatic identification method is applied to a display device and comprises the following steps:

determining the type of the CAM card according to the content control system identifier, and sending first verification data corresponding to the type of the CAM card to the CAM card so that a first key is generated after the CAM card verifies the first verification data;

2. The method of claim 1, further comprising: determining a data encryption algorithm according to the capability parameter of the display device and the type of the CAM card, wherein the first verification data comprises first key certificate data and first signature verification data, the first key certificate data is data acquired from a secure storage area of the display device according to the type of the CAM card, and the first signature verification data is data generated according to the identifier of the display device by using the data encryption algorithm;

the second verification data comprises second key certificate data and second signature verification data, wherein the second key certificate data is data stored in the CAM card, and the second signature verification data is data generated according to the identification of the CAM card by using the data encryption algorithm.

3. The method according to claim 2, wherein when the capability parameter of the display device is hash algorithm 128 or the capability parameter of the display device is hash algorithm 256 and the type of the CAM card is a standard CAM card, the data encryption algorithm is hash algorithm 128;

when the capability parameter of the display device is that the hash algorithm 256 is supported and the type of the CAM card is an ECP CAM card, the data encryption algorithm is the hash algorithm 256.

4. The CAM card automatic identification method according to claim 3, wherein when the type of the CAM card is a standard CAM card, the first key certificate data is first generation key certificate data;

and when the type of the CAM card is an ECP CAM card, the first key certificate data is second generation key certificate data.

5. The CAM card automatic identification method according to claim 1, wherein after determining that the CAM card authentication is successful, the method further comprises: and receiving the media asset decryption key sent by the CAM card, and decrypting the encrypted media asset according to the media asset decryption key.

6. An automatic CAM card identification device, comprising:

7. The CAM card automatic identification device according to claim 6, wherein the device further comprises:

a data encryption algorithm determination unit for performing: determining a data encryption algorithm according to the capability parameter of the display device and the type of the CAM card, wherein the first verification data comprises first key certificate data and first signature verification data, the first key certificate data is data acquired from a secure storage area of the display device according to the type of the CAM card, and the first signature verification data is data generated according to the identifier of the display device by using the data encryption algorithm;

8. The apparatus according to claim 7, wherein when the capability parameter of the display device is hash algorithm 128, or the capability parameter of the display device is hash algorithm 256 and the type of the CAM card is a standard CAM card, the data encryption algorithm is hash algorithm 128;

9. The CAM card automatic identification device according to claim 8, wherein when the type of the CAM card is a standard CAM card, the first key certificate data is first generation key certificate data;

10. A display device, comprising: the CAM card automatic identification device of claims 6 to 9.