CN101247506A - File enciphering method and enciphered file structure in digital media broadcasting system - Google Patents
File enciphering method and enciphered file structure in digital media broadcasting system Download PDFInfo
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- CN101247506A CN101247506A CN 200710063927 CN200710063927A CN101247506A CN 101247506 A CN101247506 A CN 101247506A CN 200710063927 CN200710063927 CN 200710063927 CN 200710063927 A CN200710063927 A CN 200710063927A CN 101247506 A CN101247506 A CN 101247506A
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Abstract
The present invention discloses a method for encrypting the file in the digital medium playing system and the encrypted file structure thereof, wherein, the method comprises the following procedures: (1) dividing the file to a plurality of segments according to the format character of the file; (2) encrypting the segment content which needs to be encrypted; (3) including paragraph identifier in each segment; and (4) forming all the key values correlative to the file to a key list which is used for transmitting to the subscriber. The encrypted file structure comprises a medium file which is composed of a plurality of segments and a key list that is composed of a plurality of key index values and the corresponding keys. Each segment comprises medium content and the segment length field which is used for indicating the total length of this segment of data. The invention possesses the advantage that the functions of speeding, quickly returning, jumping broadcasting and the like are realized and the security of the encrypted file is increased.
Description
Technical field
The present invention relates to a kind of digital media broadcasting system, particularly file encrypting method in digital media broadcasting system and encrypt file structure.
Background technology
Digital Media just progressively demonstrates the great development potentiality.With the digital movie is example, and digital movie is the product that the traditional film industry combines with digital technology, demonstrates the great development potentiality.Digital movie is compared the conventional film film and is possessed lot of advantages, and it can provide the picture of high-quality, high definition, significantly reduces cost, and makes more conveniently, and more remarkable effect copies undampedly, and fail safe is higher and more flexible.The film digitlization is the inexorable trend of film development, and at present, the digital development process is being accelerated in countries in the world, actively sets up film science and technology new system, and various digital movie players are also along with the digitized process of film is arisen at the historic moment.
Because Digital Media possesses characteristics such as being easy to harmless copy, distribution; people are can be by digital technology and the Internet free and be subjected to the digital media products of intellectual property protection without any mass loss ground batch duplicating and distribution; therefore, the protection for digital media content just seems especially important.The risk that is replicated for fear of being copied, digital content generally will be passed through encipherment protection.For digital movie, present existing encryption method is directly whole film to be adopted a content key encryption, sends decruption key to user by safe lane then.This method has also exposed some shortcomings when having guaranteed digital content effectively: on the one hand, because the whole file of digital movie file adopts a content key encryption, correspondingly, it is all multi-functional that the digital movie player is difficult to support break-point continuous playing, F.F., rewind down or jumping to be broadcast etc., brought great inconvenience for user's use; On the other hand, in a single day the decruption key of whole file is revealed or is stolen, and whole film all will illegally be watched, and has greatly damaged the interests of content supplier.
For this reason, people wish to have and a kind ofly can support break-point continuous playing, F.F., rewind down or jumping all multi-functional digital media broadcasting systems such as to broadcast, and content supplier wishes to have a kind of safer digital media broadcasting system that key can be revealed minimization of loss.
Summary of the invention
Purpose of the present invention can not be supported Play System to carry out break-point continuous playing, F.F., rewind down or jumping to broadcast at what the existing digital media file adopted that a whole file of secret key encryption brought, and the deficiencies such as hidden danger that single key exists provide a kind of and can support break-point continuous playing, jump digital media file encryption method and the encrypt file structure function such as broadcasting and key can be revealed minimization of loss simultaneously.
In order to achieve the above object, the present invention takes following technical scheme:
A kind of file encrypting method in digital media broadcasting system comprises the steps:
(1) format character according to file cuts into multistage with file;
(2) the section content that needs are encrypted is encrypted;
(3) every section comprises the paragraph identifier;
(4) all relevant key values of file are formed cipher key list, be used to be handed down to the user.
In technique scheme, further, in step (1),, be that base unit carries out file fragmentation to scheme group for the video file that adopts MPEG-2.
In technique scheme, further, in step (3), identify paragraph by be used to indicate the field of this segment data total length at each section front construction.
In technique scheme, further, in step (3), also structure is encrypted the descriptor field before each section, the algorithm and the key corresponding index value of the section of comprising sequence number, this section encryption usefulness in this encryption descriptor field, cipher key index value are used for showing the key of this section content use and the corresponding relation of described cipher key list; In step (4), cipher key list comprises all relevant key values of this media file and corresponding cipher key index value.
In technique scheme, further, in the described step (3), also structure is used to refer to the key field whether content-data in this section passes through encryption before each section.
In technique scheme, further, key value that all in the described cipher key list are relevant and corresponding cipher key index value are to adopt the random permutation order to arrange.
A kind of encrypt file structure in digital media broadcasting system comprises the cipher key list that the media file of a plurality of sections compositions and a plurality of cipher key index value and corresponding key constitute; Media content and the paragraph identifier that is used to identify paragraph are arranged in each section.
In technique scheme, further, described paragraph identifier is segment length's field of this segment data of sign total length.
In technique scheme, further, also comprise in described section and encrypt descriptor field, the cipher key index value of the algorithm of the section of comprising sequence number, this section encryption usefulness and decruption key value correspondence in the described encryption descriptor field.
In technique scheme, further, be used to refer to the field whether media content data in this section passes through encryption in addition in described section.
In technique scheme, further, key that all in the described cipher key list are relevant and corresponding cipher key index value are to adopt the random permutation order to arrange.
Compared with prior art, beneficial effect of the present invention is:
1, because media file is carried out selectivity segmentation encryption and every section introducing file encryption descriptor, and be useful on the field of the total length of this segment data of indication before the section, continue to search for any one section that just can jump to apace in the media file by this field value as side-play amount, thereby function such as realized that simply and easily F.F., rewind down, jumping are broadcast has greatly satisfied user's demand;
2, because the present invention adopts segmentation to encrypt, and all keys are formed cipher key list, so the illegal corresponding paragraph that only can cause compromised keys of revealing of the part key in the cipher key list is illegally utilized (such as illegally watching video data), and the content of other paragraphs still can be protected, and has so just improved whole safety of files greatly; Adopt different cryptographic algorithm in the paragraph that needs are encrypted, the flexibility that has improved algorithm has reduced key and has revealed the loss that causes, and the fail safe that has improved whole digital media broadcasting system has to a certain extent advantageously guaranteed the interests of content supplier;
3, the field that has the content-data that is used to refer in this section whether to pass through encryption in the media segment of the present invention, therefore, just can realize the differentiation encryption of each paragraph easily by this field, so that adjust the encryption paragraph density in the whole file, such as the content of encrypting a section every three sections, thereby realization is partly encrypted the selectivity of whole file; Adopt selective cryptographic method, only need to encrypt the partial data in the whole film, therefore, when content protecting is provided, reduced the requirement of terminal deciphering, can remedy some terminal player disposal ability defect of insufficient hardware resource.
Description of drawings
Fig. 1 is the schematic diagram of the video file encryption method of digital cinema playback system in the specific embodiment of the invention;
Fig. 2 is the schematic flow sheet of original stream file encryption method in the specific embodiment of the invention.
Embodiment
Be example with the video primary flow file for the MPEG-2 code stream below, 1 and 2 couple of the present invention describes in further detail in conjunction with the accompanying drawings.File encrypting method in digital media broadcasting system comprises the steps:
The structure of video primary flow is a hierarchical system structure, and each syntactic structure comprises one or more hypotaxis again.Beginning of primary flow is sequence head, and it has comprised the parameter such as code check, resolution of image, and other attribute of image then is kept in the sequence extension; Comprise many figure groups in each video sequence, each figure group can be made up of many width of cloth view data to scheme the organizing head beginning; Every width of cloth view data begins with image head again.The video primary flow is exactly to form in this nested layer by layer mode.
The video primary flow is that unit forms with the video sequence, and each video sequence structure the inside comprises one or more figure groups.Video sequence and figure group all are with the beginning of separately initial code, are respectively " 0x00 0x00 0x01 0xB3 " and " 0x00 0x00 0x01 0xB8 ".Therefore, organize initial code and just can realize segmentation by searching figure in the primary flow file.Simultaneously, adopt that to be convenient to terminal as the segmentation principle of base unit be that unit adjusts and looks audio sync to scheme group to scheme group.
Cryptographic algorithm and every section figure group of content key encryption at random of step 20, usefulness standard.
Figure organizes data for each section, can select a Standard Encryption algorithm and random content key to encrypt voluntarily.Cryptographic algorithm both can have been selected symmetric key algorithm such as AES (Advanced Encryption Standard), 3DES, and (DES is the abbreviation of data encryption standard, 3DES is exactly a triple des) etc., also can select asymmetric key algorithm such as RSA (RSA is a kind of general asymmetric key algorithm, and it is the abbreviation of Rivest, Shamir and three names of Adleman), ECC (elliptic curve cipher) etc.; Content key length can independently be selected according to the demand of fail safe, and the encryption key that different figure organize use produces by randomizer, satisfies linear independence.
The selectivity segmentation encryption technology of this independent and flexible, the fail safe that has improved digital cinema playback system, reduced effectively key reveal cause loss.Even the decruption key of a certain paragraph is stolen by the disabled user, the disabled user also haves no right to watch other parts of film because of the decruption key that can't obtain other paragraphs, thereby has effectively guaranteed the interests of content supplier.
According to each section figure organize data physical length, encrypt algorithm and key that these figure group data are adopted, can construct this section keyword K, segment length L and encrypt descriptor, wherein, the K field is used to refer to follow-up video data and whether passes through encryption.Because at present the terminal player of digital camera Play System also is in continuous perfecting process, the disposal ability of some terminal player is limited, may cause picture that the phenomenon of marked halt is arranged when a high code check film of encrypting is fully play in deciphering.By selectivity part paragraph method of encrypting, just can in the protection digital content, remedy terminal player disposal ability defect of insufficient, obviously those skilled in the art should be understood that the K field is not essential, the K field can not have.Segment length L has indicated the total length of this section, can be used as the address offset amount of intersegmental quick redirect, thereby having realized simply and easily jumping broadcasts, F.F., rewind down function.Encrypt descriptor and comprised section sequence number, the algorithm of encrypting this section use and cipher key index value, the cipher key index value only is used to show the key of this section content use and the corresponding relation of the overall cipher key list of film, real decruption key value also needs to search from authorization, and can support the cryptographic algorithm that each section employing is different by encrypting descriptor, thereby more effectively guarantee the fail safe of digital content reliably.
The user just can extract secret key decryption and play film after having obtained the proper authorization permission that contains cipher key list.
In the process of structure cipher key list, cipher key index is not a sequence arrangement, but the method that has adopted the random permutation order is with further raising fail safe.
As shown in Figure 1, by a kind of encrypt file structure in digital media broadcasting system that said method forms, comprise the cipher key list that the media file of a plurality of sections compositions and a plurality of cipher key index value and corresponding key constitute; Media content data and the segment length's field that is used to indicate this segment data total length are arranged in each section.Fig. 1 stage casing 1 ... to section N sequence arrangement, schematically show a plurality of sections that constitute media file; Whether the media content data that the Duan Qianyou of each section is used to refer in this section passes through the field K of encryption, the field L that indicates this segment data total length and encryption descriptor field.Encrypt the section of comprising sequence number, the algorithm of this section encryption usefulness and the cipher key index value of decruption key value correspondence in the descriptor field; Key value (representing with key 1-N among Fig. 1) that in the cipher key list all are relevant and corresponding cipher key index value (being the cipher key index value 1-N among Fig. 1) are to adopt the random permutation order to arrange.
It will be apparent to those skilled in the art that detailed description, still can carry out file encryption according to the present invention for the digital media file of the other types of nonnumeric video according to above-mentioned embodiment.
It should be noted last that above embodiment is only unrestricted in order to technical scheme of the present invention to be described.Although the present invention is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is made amendment or is equal to replacement, do not break away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (11)
1. the file encrypting method in digital media broadcasting system comprises the steps:
(1) format character according to file cuts into multistage with file;
(2) the section content that needs are encrypted is encrypted;
(3) every section comprises the paragraph identifier;
(4) all relevant key values of file are formed cipher key list, be used to be handed down to the user.
2. the file encrypting method in digital media broadcasting system according to claim 1 wherein, for the video file that adopts the MPEG-2 code stream, is that base unit carries out file fragmentation to scheme group in step (1).
3. the file encrypting method in digital media broadcasting system according to claim 1 and 2 wherein, in step (3), identifies paragraph by be used to indicate the field of this segment data total length at each section front construction.
4. the file encrypting method in digital media broadcasting system according to claim 1 and 2, wherein, in step (3), also structure is encrypted the descriptor field before each section, the algorithm and the key corresponding index value of the section of comprising sequence number, this section encryption usefulness in this encryption descriptor field, cipher key index value are used for showing the key of this section content use and the corresponding relation of described cipher key list; In step (4), cipher key list comprises all relevant key values of this media file and corresponding cipher key index value.
5. the file encrypting method in digital media broadcasting system according to claim 1 and 2, wherein, in the described step (3), also structure is used to refer to the key field whether content-data in this section passes through encryption before each section.
6. the file encrypting method in digital media broadcasting system according to claim 4, wherein, key value that all in the described cipher key list are relevant and corresponding cipher key index value are to adopt the random permutation order to arrange.
7. encrypt file structure in digital media broadcasting system comprises the cipher key list that the media file of a plurality of sections compositions and a plurality of cipher key index value and corresponding key constitute; Media content and the paragraph identifier that is used to identify paragraph are arranged in each section.
8. the encrypt file structure in digital media broadcasting system according to claim 7, wherein, described paragraph identifier is segment length's field of this segment data of sign total length.
9. according to claim 7 or 8 described encrypt file structures in digital media broadcasting system, wherein, also comprise in described section and encrypt descriptor field, the cipher key index value of the algorithm of the section of comprising sequence number, this section encryption usefulness and decruption key value correspondence in the described encryption descriptor field.
10. the encrypt file structure in digital media broadcasting system according to claim 9 wherein, is used to refer to the field whether media content data in this section passes through encryption in described section in addition.
11. the encrypt file structure in digital media broadcasting system according to claim 7, wherein, key that all in the described cipher key list are relevant and corresponding cipher key index value are to adopt the random permutation order to arrange.
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