CN1812565A - Data ciphering method in mobile communication program - Google Patents
Data ciphering method in mobile communication program Download PDFInfo
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- CN1812565A CN1812565A CN 200510033064 CN200510033064A CN1812565A CN 1812565 A CN1812565 A CN 1812565A CN 200510033064 CN200510033064 CN 200510033064 CN 200510033064 A CN200510033064 A CN 200510033064A CN 1812565 A CN1812565 A CN 1812565A
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Abstract
A method for enciphering data in program of mobile communication includes judging whether relative video stream is I image or not if it is video stream at time of multiplexing after multimedia stream is coded, executing encipherment if relative video stream is I image, integrating enciphered I image video stream with audio stream and video stream being not enciphered to form them to be whine and transmission signal, using formed signal as enciphering mode to carry out encipherment on I image in data transmitted by satellite TV .
Description
[technical field]
The present invention is relevant encryption method at mobile communication system sound intermediate frequency video data.
[background technology]
Digital satellite television is utilizing under the situation of digital technology, its service channel is equivalent to the conveying capacity of five analog channels, and it can also provide higher tonequality and image quality, can realize that also both sides serve and can link to each other with the internet, so it has broad prospects.Digital TV set-top box industry is the center with the U.S., Europe, but because ground such as the Middle East, Asia have also adopted digital satellite television, so strong growth has appearred in the application of digital satellite television.
Digital satellite communication is mainly produced the dealer by pay TV and is dominated, also account for very big proportion in the pay TV that digital TV set-top box market is directly bought in pay TV, from technological layer, the digital TV set-top box is that the analog content of broadcasting innings aspect is encoded, and to digitized transmission signal decoding, and via satellite, mode such as cable and earthwave, make the function that on numerous spectators' common TV, can watch anolog TV signals.Because this process is the process through a complexity, so broadcasting office is to be difficult to solve for the technical matters that multiple broadcasting is provided.
At first because the problem of television standard, Jue Daduoshuo broadcasting office is all the industry standard of the digital communications satellite service (DSS) of the European standard of so-called digital TV broadcasting (DVB) and the U.S. as oneself in the world, in pay TV, have only the applicant just can obtain receiving system with good conditionsi (CAS) technical support of service signal, at present, surplus Middle Ages garden, NDS, VIACCESS etc. ten company all in this industry of competition.
Digital TV broadcasting public interface (DVB-CI) with the CAS service take as the leading factor, in the digital paid television services department that with Europe is the various countries at center, they are developed CAS alone and are perfect, and develop more function alone, to provide more service to the consumer, they think has unified standard to be very important, 1996 the European electroporation standardization committee (CENELEC) passed through the EN50221 of DVB-CI specification, unified standard is got on the right track.
But this but suffers existing CAS owner's opposition, because on new unified regulation, it has included most existing standard on the one hand, on the one hand the additional function that appends is kept the power of appending.
As what CAS mentioned, from the receiving control device of the digital TV set-top box of digital satellite television special use, it has born the paying receiving function of digital satellite television.Particularly basic pay channel and PPV are supported simultaneously, so the shared price proportion of satellite television receiver device only is 15% in the covering price owing to CAS.For protection TV content, the transmission of MPEG2 packet encryptionization, to have only by receiver this is understood, observer just can be seen television content.
Have only in the PCMCIA groove, inserting specific card and could realizing rating of this deciphering function.This card just is known as public interface (CI) type TV set-top box.In addition, in the embedded type C AS type that the is called digital TV set-top box that realizes with the form of tundish on the OS device driver on the CPU of main frame.
Recently, portable market is developed rapidly, has had functions such as VOD, photograph, shooting on the mobile phone.Particularly can realize VOD and TV reception by mobile phone.The visual services that can receive satellite television that is known as PMSB recently also enters into commercial step.But because content is diversification, and present content viewable only be that specific user serves, and this is a kind of reality.
A kind of scheme is to use only to the specific crowd effective means, this mode is as transmitting decoded data, the user who is only permitted to have the right to use just can watch a kind of special device of television image, it has only with encoder and modifies tone and the receiver of additional specific decoder realizes, if there is not this receiver just can not see television image.
The reception data that control receives only just can seen original program by data decode.Because at present the most basic satellite television is to be that the commercial TV at center is broadcasted with the multichannel pay TV, therefore has only the recipient of defrayment can see that just the control receiving system of specific TV programme is necessary.Utilizing present digital TV set-top box to receive in the system of satellite television, employed control method of reseptance is whole decoding processes.Promptly all data are all decoded, and utilize the decoder of TV set-top box to decode to watch program.
But, utilize aforesaid present control receiving system, receiving under the situation of satellite television programming the problem of in the receiver data of whole decodings being decoded and will cause mobile phone to crash on the mobile communication terminals such as mobile phone.
In addition, utilize the control receive mode of whole decoding processes, use can cause host CPU that more program and internal memory will be arranged on mobile communication terminal, and this is not suitable for mobile communication terminal yet.
[summary of the invention]
Therefore, purpose of the present invention is provided at satellite television exactly and transmits in the data, only I image/video data are decoded, and in the mobile system that receives pay TV, move audio-visual data encryption method in the mobile communication system of receiving control system effectively.
To achieve these goals, data ciphering method from mobile communication system of the present invention is: after media stream is encoded, if make the video flowing of multipleization, relevant video flowing will judge whether it is the I image, and relevant judged result and associated video stream carried out the I image processing and carry out encipheror, more than after encrypted I image/video data, voice data and the video data do not encrypted make up, it is modified tone and transmits, Here it is device provided by the present invention.
More than the I image be TV signal decoding.Above media stream comprises audio stream and video flowing, the mixed mode that video flowing is made up of I image, B image, P image.If not being the I image, just not it is not encrypted video flowing.
Transmit in the data as the part cipher mode of only the I image being encrypted at satellite television by above-mentioned explanation and according to the present invention, it can move the acceptance control method in the mobile communication system that receives pay TV effectively, so the present invention just provides the data ciphering method in this mobile communication system.
In addition, according to the present invention because in existing system, utilize the digital TV set-top box to the anti-mode of encrypting of whole ciphered data, on mobile communication terminal, all can not handle, on the mobile phone terminal machine, can receive data ciphering method in the mobile communication system of TV programme so we just provide with the part cipher mode to these.
[description of drawings]
The present invention is described in detail below with reference to accompanying drawings.
Fig. 1 is the flow chart according to the control reception of the digital satellite television of example of the present invention;
Fig. 2 carries out the flow chart that notion is showed to the formation of the transmitter of foundation example of the present invention;
Fig. 3 carries out the flow chart that notion is showed according to the formation of the receiver of example of the present invention;
Fig. 4 is the flow chart according to the part encryption method of example of the present invention.
[embodiment]
Fig. 1 is the flow chart according to the control reception of the digital satellite television of example of the present invention.Fig. 2 carries out the flow chart that notion is showed to the formation of the transmitter of foundation example of the present invention.Fig. 3 carries out the flow chart that notion is showed according to the formation of the receiver of example of the present invention.
With reference to Fig. 1, the control receiving system of digital satellite television is made of transmitter 100, receiver 110.Video, the audio stream of 100 pairs of compressions of transmitter are encrypted, and together they are become transportation flow with information on services and receiving control information, and transmit to receiver 110 by network.
Receiver 110 utilize that the receiving control information that transmits from transmitter 100 and the security information on the IC-card decide stream which partly can be used as video playback and carry out encryption the part of necessity.
Be elaborated below with reference to Fig. 2 for transmitter 100.
With reference to Fig. 2 transmitter by program table 200, control receiving system 210, recipient's database 215, encoder 220, multipleization portion 230.Formations such as modified tone portion 240, transport unit 250.
Above program table 200 sends information on services to multipleization portion 230, again program information is sent to control receiving system 210.Receiving control system 210 the control that comprises EMM to the recipient's of each program rating authority information etc., program receive information, ECM, command information that TV signal is decoded etc. sends multipleization portion 230 to.
I image in the video data that 235 of decoders transmit encoder 220 is encrypted.After 240 pairs of signals that transmit from multipleization portion 230 of modified tone portion modify tone, transmit to receiver by transport unit 250.The voice data that 240 pairs in i.e. modified tone portion transmits from multipleization portion 230 and the I image/video data of encryption and the video data of not encrypting make up and carry out modified tone.Then, modified tone portion 240 is sent to receiver to the data that modify tone by transport unit.
Receiver is described with reference to Fig. 3.
Comprise with reference to Fig. 3 receiver: data reception portion 300, CDM/FEC310, adapter (ChannalAdaptor is hereinafter to be referred as CA) portion 320, decoder 330 and efferent 340.
CDM/FEC310 carries out error checking to the data that transmit from data reception portion 300.CA portion 320 carries out EMM, ECM hardware in the transmission stream that the CDM/FEC310 place transmits.
In addition, whether 320 pairs of transmission streams that transmit from CDM/FEC310 of CA portion are decoded and are detected and carry out decoding.
330 pairs of data that transmit from CA portion 320 of decoder are decoded and are exported by efferent.
The management information (EMM) that finds command the sign bag (PID) that limited the entering (CAT) of receiver utilization definition distributed flows, and utilization is allocated in relevant recipient's EMM and the PID of program form (PMT) extracts processing to the adjective ECM that orders control information (ECM) stream.The rating membership information of the control receiving feature of the program of observer and relevant ECM and IC-card stored compare with to rating qualification confirm.If confirm the recipient rating qualification is arranged, IC-card will reproduce the control password (CW) that uses when encrypting, and receiver is also encrypted with relevant data flow is counter relevant procedures.
More than anti-data stream encrypted after decoding, export by efferent.Use the anti-card of encrypting to be used for distinguishing each data flow.Based on packet ID, in common receiver, the ID of the packet in the data flow of a transmission is unique, in demultplexer and filter according to the specific hardware rule, if retrieve the data that all hardware rule is satisfied in all packets or discovery, then in packet, extract data and also a storage of extracting is handled in fifo buffer and in intermediate processor.In audio-video codec, the data flow of input is decoded and the output audio vision signal.
Here anti-the encryption is divided into anti-encryption of hardware and the anti-dual mode of encrypting of software product.Under the anti-situation of encrypting of software, must carry out part and encrypt, if do not do like this, the measuring ability of CPU will reduce in anti-the encryption.
Before discussing decoding process, at first to introduce the formation of mpeg image.In MPEG, image is handled with the unit of regulation, and image divides frame formula image and two kinds of formula images in the unit of symbolism.Just be called frame formula image with what frame formula unit came symbolism, just be called a formula image with what field formula unit came symbolism.
Image divides three types at most: the firstth, and the I image, be not service time compress technique but usage space compress technique compression, because it is compression service time not, just can prevent to produce mistake because of temporal accumulation, because usage operation prediction, so it can produce the more bits number than other images when the symbolism, in addition because the not compression of property service time, owing to the function of multiple number independent change is arranged, therefore can be used as the image that to have access to arbitrarily.The secondth, the P image is inferred owing to having used to move with reference to nearest I image or P image, so the bit number that produces is just little.The 3rd is the B image, but as the image of twocouese prediction symbol, is not only clockwise and on counterclockwise and also can infers, so just can make things convenient for week thickly to infer.
The B frame has total difference of later I of former I or P frame and B frame or P frame, if therefore use the B frame just can obtain higher compression ratio.
The MPEG video is the mixed mode of these three kinds of images, and the ratio of I image is about 2-4%, but the I image be form other symbolism image with reference to image.Therefore receiving under the situation of paying satellite television programming on the mobile communication terminal, replacing the parts of images that has only I image and encryption of all cipher modes.Part is encrypted as only section data being encrypted, according to the standard flexible sampling mode of encryption partly, though only about 10% of all data are encrypted, but under the situation of having only the I image to encrypt, owing to just 2～4% of total data is encrypted, so amount that must anti-ciphered data on receiver just reduces to new high.This is to realizing effectively that on mobile communication terminal the control receiving system is very effective.
Fig. 4 is the flow chart according to the part encryption method of example of the present invention.With reference to Fig. 4, transmitter carry out multipleization after multimedia data stream is encoded, step S400, and above multimedia data stream is exactly an audio and video streams, and this moment, it was the mixed mode that I image, B image, P image make up with defined amount in video flowing.After 400 step, transmitter is judging whether it is video flowing, and step S402 is under the situation of video flowing, just judge whether this video flowing is the I image, step S404, the judged result of step S404 is: if relevant video flowing is the I image, transmitter just is implemented as relevant I image and encrypts, step S406, if the judged result of step S404 is: relevant video flowing is not the I image, and transmitter is not just carried out relevant cryptographic operation, step S408.Then, transmitter is after the I image/video data that voice data is promptly encrypted, the video data do not encrypted make up modified tone, and step S410 transmits step S412 to the data that modify tone.
Receiver receives the data that transmit from satellite and encrypts ciphered data is counter, receiver is only to anti-encryption of I image in all videos frame, therefore this compares with whole ciphered data, anti-encryption only accounts for its whole 2-4%, even in addition B image or P image are not encrypted, and only the I image are encrypted, because there is not the image of reference, so receiver also can not be decoded, therefore in control, just can not go wrong.
The present invention not only limits above example, in thought range of the present invention and other a plurality of fields personage of having certain knowledge can do more kinds of distortion.
Claims (5)
1, the data encryption method in the mobile communication system comprises:
After media stream encoded, if make the video flowing of multipleization, relevant video flowing will judge whether it is the step of I image;
If judged result is the step that the I image is just encrypted;
And after above encrypted I image/video data tones audio data and the video data do not encrypted made up, to its step that modifies tone and transmit.
2, as the data encryption method in the claim item 1 described mobile communication system, it is characterized in that:
Encrypt in the command information that the TV signal of I imagery exploitation decoding is decoded.
3, as the data encryption method in the claim item 1 described mobile communication system, it is characterized in that:
Described multimedia data stream comprises audio stream and video flowing.
4, as the data encryption method in the claim item 1 described mobile communication system, it is characterized in that:
Described video flowing is that I image, B image, P image make up with specified standard.
5, as the data encryption method in the claim item 1 described mobile communication system, it is characterized in that:
If not being the I image, just not do not encrypt described video flowing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510033064 CN1812565A (en) | 2005-01-28 | 2005-01-28 | Data ciphering method in mobile communication program |
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| CN 200510033064 CN1812565A (en) | 2005-01-28 | 2005-01-28 | Data ciphering method in mobile communication program |
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| CN1812565A true CN1812565A (en) | 2006-08-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104077541A (en) * | 2014-06-20 | 2014-10-01 | 纵横壹旅游科技（成都）有限公司 | Selective encryption method and device based on multimedia data |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104077541A (en) * | 2014-06-20 | 2014-10-01 | 纵横壹旅游科技（成都）有限公司 | Selective encryption method and device based on multimedia data |
| CN104077541B (en) * | 2014-06-20 | 2017-02-01 | 纵横壹旅游科技（成都）有限公司 | Selective encryption method and device based on multimedia data |
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