CN86103053A - The method and apparatus of scrambling and descrambling TV signal - Google Patents
The method and apparatus of scrambling and descrambling TV signal Download PDFInfo
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- CN86103053A CN86103053A CN198686103053A CN86103053A CN86103053A CN 86103053 A CN86103053 A CN 86103053A CN 198686103053 A CN198686103053 A CN 198686103053A CN 86103053 A CN86103053 A CN 86103053A CN 86103053 A CN86103053 A CN 86103053A
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- encryption key
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0819—Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s)
- H04L9/0822—Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s) using key encryption key
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0891—Revocation or update of secret information, e.g. encryption key update or rekeying
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/14—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using a plurality of keys or algorithms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
- H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving video stream encryption
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
- H04N21/26606—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel for generating or managing entitlement messages, e.g. Entitlement Control Message [ECM] or Entitlement Management Message [EMM]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
- H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video stream decryption
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
- H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
Abstract
A kind of method and apparatus of descrambling TV signal is to being used for the sign indicating number of descramble signal, adopting the technology of three infill layers.At transmitter terminal, distribute key to be used for encrypting the reservation key.In the digital data channel of TV signal, transmit encrypted session key.The reservation key also is used for encrypting descrambling code, and this descrambling code also transmits in the data channel of TV signal.At receiver end, utilize and distribute key to decipher encrypted session key.The reservation key of having deciphered is used for the deciphering and descrambling sign indicating number again.Then, descrambling code can be used for other signal in descrambling and/or the decryption receiver.
Description
The present invention relates generally to the field of communication system, particularly be directly connected to the method and apparatus of scrambling of fee-TV system and descrambling TV signal.
As the effective means that a large amount of selection information and entertainment are provided to the public, the fee-TV system obtains extensively to admit.But a high-quality system, its price are very high.Therefore, must guarantee to regain enough funds, the person comes maintenance system so that make the broadcasting.For this purpose, many broadcasting persons turn to scrambled broadcast-signals, allow those require server's defrayment.Only the subscriber of native system just being provided can be the decoder of signal descrambling.And many decoder design get only just understands descramble signal when the subscriber can cash payment.
Many method for scrambling and equipment produce according to the line scanning process and show that TV signal is its foundation.Utilize the progressive series that transmits horizontal line chronologically to come scanned picture information.Be transmitted be corresponding to the row last every some brightness size the continuous analog signal.Fig. 1 shows sort signal, this shows, in the series of standards row, in the time interval of any two adjacent effective row time interval of video information (transmit), is distinguished by the time interval of not transmitting video information.A kind of time interval of back is called the horizontal line black-out intervals, resets to start of line position as scanning means and use in television receiver.
In the standard colour TV signal, effectively line time comprises a signal of representing three independent chrominance component instantaneous values simultaneously at interval.This three chrominance components are encoded into the method for a signal, in the North America, Canada and Japan's standardization.This method is called NTSC(NTSC) standard.Other country adopts other standard, is called the PAL(phase-aoternation line system) and SECAM(order and storage system), but these standards have with the identical basic format of NTSC standard, include a line blanking period and effective line time interval in each scan line.
Studying at present other kind standard of analog video signal, they are particularly suitable for satellite and cable transmits, and can improve to some extent than the image quality of existing standard.Aspect fee-TV, sort signal is a particular importance, and in effective line time interval of scan line, sort signal is formed according to the time-multiplexed of three independent chrominance components.Replace NTSC, PAL or Sequential Color and Memory system formula become the mode of a signal to three component codings, these component transformations are become digital form and utilize the time compression technology to transmit in proper order.A kind of form of sort signal mode is called MAC colour television system (MAC).The signal that is produced by the time compression technology also is what to comply with in the basic format identical with the SECAM standard with NTSC, PAL, is included in to have line blanking period in each scan line and effectively line time is at interval.When adopting the MAC signal, as shown in phantom in Figure 2, can transmit numerical data at line blanking period.Like this, the voice signal part can be transformed into digital form, transmits at line blanking period as numerical data.Therefore, often line blanking period is called " data channel ", line blanking period can comprise several multiplexing data-signals.Chrominance component in the data channel, voice signal and other signal can accumulate the message part of TV signal.
In the scrambled television signal, revise the selected parameter of signal imitation video component according to the pseudorandom scrambled code.In the data channel of signal, can issue television receiver to this scrambler, utilize the decoder of receiver to come the descrambling video component, recover the appropriate format of watching again.Data channel also can be encrypted with the further obstruction person of having no right received signal with protecting.
Though term " encryption " is often exchanged use with " scrambling " and relative " deciphering " and " descrambling " thereof, and a difference is wherein arranged.Encryption and decryption are used for digital signal, and scrambling and descrambling then are used for analog signal.This is owing to existing basic difference to distinguish between the digital and analog signaling.Digital signal is defined by bit-level, and the bit that is adjacent of each bit is independent of each other here.Coding, conversion or the inverse transformation of forming the data bit of signal can not influence the signal transmission characteristics of bit-level.Therefore, the digital signal of encryption comprises all information that original signal has, and utilizes deciphering can accurately recover original signal.On the other hand, the modification of analog signal and change just can influence its transmission characteristic.For example, change the numerical value of a point in the analog signal waveform, and do not consider consecutive points in the waveform, this will increase the bandwidth of signal.Like this, in order to transmit the bandwidth that the signal that is modified just needs broad exactly.Therefore, when the scrambling analog signal, selected parameter should make the change minimum of signal transmission characteristics.
Utilize to revise the simulation color component of signal, can have a lot of methods to be used for the scrambled television signal.These methods comprise the amplitude of revising chrominance component, revise the time of transmitting color component, and the amplitude and the transmission time of revising chrominance component.Certainly, every kind of modification is according to finishing for the prescribed manner of receiver with the data channel transmission of TV signal.An example utilize revising the time scrambled television signal of transmitting color component be disclosed in common transfer in the U.S. Patent application of application on June 24 nineteen eighty-three, its sequence number is 507,765, exercise question is " encryption and decryption of vision signal (scrambling and a descrambling) ".Described application here as a reference.For the time compression transmission, when chrominance component is transformed into digital form, also can encrypt, for example, such like an elephant what in the MAC TV signal, adopted.This encryption method be disclosed in common transfer in the U.S. Patent application of on May 21st, 1985 application, its sequence number be-, exercise question is " method and apparatus of formation encryption and decryption TV signal ".This application here also as a reference.Have, the sound component of TV signal also can scrambling in its analog form again, perhaps is transformed into digital form and encrypts, through data channel transmission.
In typical encryption system, revises the bit architecture of encrypted digital data signal, be to be one to organize in the similar manner greatly according to the general fashion that the mode of transmitter terminal decision is carried out, therefore, extremely can not be by thoroughly searching this mode of finding.Send the accurate description of encrypting to specify receiver decoder, just can recover original distribution with mode.In prior art, the description of this mode is called " joining close key ", and the process (perhaps use " decryption key " is more suitable) that encryption key is notified to designated user is called " key distribution ".Decryption key comes from encryption key, and it allows enciphered message revert to its original form.
In order to guarantee the encryption of numerical data, in prior art, utilize many encrypted codes.Existing integrated circuits equipment is used for carrying out some algorithm of high-speed encryption and deciphering, is enough usefulness to the data channel of TV signal.A kind of such algorithm is arranged, adopted owing to be difficult to expose, it is the data encryption standard (DES) that NBS adopts.Other algorithm also is utilizable, but has only a requirement, and data channel can not deciphered at all when having decryption key exactly.
Chrominance component for TV signal perhaps also has voice signal, owing to comprise the enciphered data channel of its descrambling code, usually only encrypt with a kind of method, like this, the decryption key (being the reverse encryption key) of deciphering channel must be common to all users.But, use a common decryption key that certain means need be provided, not in native system subscriber or present and the unpaid subscriber's hand so that stop decryption key to spread to those.
Therefore, the object of the present invention is to provide a kind of method and apparatus that protects ground scrambled television signal.
Further purpose of the present invention is, encrypts in one way being used for the scrambler of scrambled television signal, and the recipient that haves no right of TV signal can not be detected.
Use common deciphering so to distribute, make exactly and have no right the recipient and can not receive key.Have a kind of method that secrecy provision is provided for this reason, be exactly between short-term in (for example per minute) change decryption key.Thereby, force and professional have no right the recipient and keep lasting with the user that has the right and link, must receive the constantly decryption key of modification continuously so that have no right the recipient.Snarling the second method of having no right the recipient of decryption key, is the superencipher of carrying out decryption key, promptly the deciphering of decryption key acquisition system in the receiver and data channel is integrated in single device, and this device is difficult to duplicate.
The method and apparatus that protects ground scrambled television signal according to the present invention comprises three infill layer technology.At the television transmitter end, distribute key to be used for encrypting and give about key.Distributing key all is unique to each subscriber, and remains unchanged for a long time.But, give about key and change periodically, for example by week or change monthly.After this, in the digital data channel of TV signal, transmit about key that gives of having encrypted.Give about key and also be used for encrypting descrambling code.Descrambling code is included in a plurality of keys of using in the receiver, with its descrambling or decipher various signals in receiver, and for example video component of scrambling and/or voice signal.Descrambling code also is a periodically-varied, and for example for additional safeguard procedures are provided, per second changes 4 times.After this, in the data channel of TV signal, transmit encrypted descrambling sign indicating number.
In receiver, utilize and distribute key to decipher about key that gives of having encrypted, therefore, give about key and can be used to decipher encrypted descrambling sign indicating number.After this, the usefulness that descrambling code can be used as descrambling in the receiver or deciphers other signal, for example vision signal of scrambling and/or voice signal.
In another embodiment of the present invention, in the data channel of TV signal, also transmit the sign indicating number that comes into force.The coming into force of about key derivation of giving by deciphering of come into force sign indicating number and this machine of being received by receiver yard compares.When these two sign indicating numbers that come into force are suitable, allow about key deciphering and descrambling sign indicating number that gives of having deciphered.After this, in receiver, the descrambling code of having deciphered can be used for deciphering and/or other signal of descrambling.
Fig. 1 and Fig. 2 are the diagrams of line scan television signal.
Fig. 3 is according to the present invention, to being used for the block diagram of the embodiment of system that the sign indicating number of descrambling and/or deciphering television signal information part encrypts.
Fig. 4 is according to the present invention, to being used for the block diagram of the embodiment of system that the sign indicating number of descrambling and/or deciphering television signal information part is decrypted.
Fig. 5,6 and 7 is according to the present invention, to being used for the block diagram of other embodiment of system that the sign indicating number of descrambling and/or deciphering television signal information part is decrypted.
Fig. 8 is the block diagram of fee-TV decoder one example.
Fig. 3 and Fig. 4 are the block diagrams according to an embodiment of scrambled television signal system of the present invention.Fig. 3 illustrates the encryption of transmitter terminal, and Fig. 4 illustrates the deciphering of receiver end.As shown in Figure 3, give about key 30 with distributing key 32 in block diagram 33, to encrypt.Distributing key all is unique to each subscriber, and remains unchanged in long-time.In addition, give about key and change at interval, as press jede Woche or change in every month by giving fixing time.After this, in the TV signal digital data channel, transmit about key that gives of having encrypted.Give about key and also be used for encrypting descrambling code 31.In receiver, descrambling code comprises descrambling and/or deciphers the key that various signals are used.These signals can comprise the TV signal video component of scrambling, scrambling or that encrypted voice signal and/or need other signal of descrambling or deciphering in receiver.In the digital data channel of TV signal, also transmit encrypted descrambling sign indicating number.Also can clocklike revise descrambling code, for example per second is 4 times, so that further protection is provided.
With reference to Fig. 4, the digital data channel of the received TV signal of square frame 40 expression, it comprise shown in Fig. 3 encrypted give about key and encrypted descrambling sign indicating number.That has encrypted gives about key with distributing key 41, offers square frame 43.Distributing key to distribute to the subscriber, as remuneration to the subscriber of system's received payment.Key all is unique concerning each individual subscriber, or a big part to the one group of key that enough is used for stoping key to conclude the business.Distribute the key 41 can be identical, or derive by 32 with distribution key 32 shown in Figure 3.Utilize television transmitter, in data channel, each that is adopted is distributed key 41, transmission has been encrypted separately gives about key.
Fig. 5 is the present invention another embodiment in the relevant deciphering of receiver end.Identical label is used for discerning the corresponding units shown in Fig. 4.In this embodiment, the sound part of encryption and transmitting television signals in data channel.As mentioned above, utilize in the square frame 43 deciphered give about key, deciphering sound and deciphering descrambling code in square frame 44.
Relevant another embodiment in the receiver end deciphering of the present invention is shown among Fig. 6.Only there is about key that gives of having encrypted to be transferred to all users in this embodiment.All users use identical distribution key D, but are unique for its source of each subscriber.Distribute key D to derive by retainingf key K and subscriber code C.The digital data channel of the TV signal that square frame 50 expressions have received, it comprises the video descrambling code of having encrypted that gives about key and encrypted.About key that gives of having encrypted is delivered to square frame 54, and here retainingf key K maintains secrecy.The subscriber code C of square frame 51 also is unique to the subscriber, is manually added by the subscriber.The advantage of this system is, only need transmit one encrypted give about key, therefore can make to give approximately and simplify.Have again, utilize and revise artificial input code C, can distribute key D by accidental change.Distribution key D is that the subscriber code C from retainingf key K and square frame 52 derives.Therefore, in square frame 54, utilize the distribution key D that has derived, decipher about key that gives of having encrypted, the sign indicating number of encrypted descrambling together with data channel comes is added in the square frame 55.In square frame 55, utilize current about key that gives of having deciphered to come the deciphering and descrambling sign indicating number.After this, in receiver, can be used as descrambling or decrypted signal and use, by square frame 56,57 and 58 expressions.
Relevant another embodiment in the receiver end deciphering of the present invention is shown in Fig. 7.The artificial input code that is provided by the subscriber has been provided this embodiment, but also has got rid of the common distribution key that all subscribers are had.In this embodiment, the data channel of signal comprises about key that gives of having encrypted, based on decoder address or sequence number unique come into force sign indicating number and encrypted descrambling sign indicating number.Give about key and offer square frame 62,, it is deciphered by the distribution key of square frame 61 at this.After this, the encryption key of having deciphered is offered square frame 64,,, derive the 32 unique bit internal sign indicating number that comes into force according to address of giving about key and decoder or sequence number at this.Coming into force of being transmitted in come into force sign indicating number and the data channel of being derived yard made comparisons, if both are suitable, then provides a logical signal to AND gate 66.Only come into force sign indicating number when adaptive with data channel transmits when the inside of the being derived sign indicating number that comes into force, AND gate 66 just allows to be passed through from about key that gives of having deciphered of square frame 62, arrival square frame 67.After this, utilize square frame 67, can come the deciphering and descrambling sign indicating number with giving about key.
In the embodiment shown in fig. 7, the duration of at every turn giving approximately is 30 seconds, and at this moment in the interbody spacer, each decoder is that the next one gives deciphering approximately and gives about key.Shown in label among Fig. 7 62, giving about key is to derive from tailor-made integrated circuit, and this integrated circuit is difficult to duplicate.In data channel, current usefulness is the about key of giving of decrypted video descrambling code, also is used for deriving the inside sign indicating number that comes into force.The received sign indicating number that comes into force that one bit error correction is added to 32 bit long is gone up (enough addressing are 4,000,000,000 decoders nearly).Only look last 7 hours duration of works of channel,, so just emit and give about key from tailor-made integrated circuit if the some time receives the suitable sign indicating number that comes into force in arbitrary particular electrical.
This sign indicating number (having correction bits) that comes into force comprises one 39 bit words, and it is transmitted in 250 kilobits/second channels.Therefore, in per 52 minutes, 2,000 ten thousand receivers of addressable.Through 7 hours, each decoder will independently come into force under the occasion at 8 kinds with an error correcting code.At bit error rate (BER) is 10
-2The time, test infirm probability is 0.044 at every turn.8 times all infirm probability of test is 1.4 * 10
-11(Mean Time Between Failures is 100,000,000 years).
The main advantages (be different from and give about key) of sign indicating number of coming into force is, can receive many times mistakenly and do not influence service to the user.Therefore, do not need error correction completely.In the scale of 1,000 ten thousand receivers, the address cycle time is 26 minutes.If most of decoder functions are 10 at bit error rate
-3, so, in the normal delivery time of typical TV programme, will have 99.95% decoder to come into force.
For embodiment shown in Figure 7, when wait state, television receiver should automatically switch at used usually interchannel, searches the sign indicating number that comes into force.; wait state is not a kind of enforceable requirement; suppose (come into force count) from the last time given approximately that counting deposits in (in the protective integrated circuit is arranged) nonvolatile memory; and supposition per 7 hours service time at interval in, receiver continuous operation has at least reached 52 minutes such time intervals.In other words, time interval that receiver can writing task, and 7 hours restriction expanded to a very big limit arbitrarily, decide probability so that guarantee to receive the giving of sign indicating number of coming into force.In addition, when (according to its counter) only was left one hour time of commencement, receiver can (by the demonstration of teletext) send information, a time interval of request work or wait state.At last, when 7 hour time interval finished, receiver did not need all to turn off its business and promptly stops descramble signal, reduced the professional time interval but replace to introduce, and the black and white of for example doing several hours earlier receives.There are many possibilities to encourage payment and/or the operation that pays fees by the hour, to guarantee to receive the sign indicating number that comes into force.The function of sign indicating number of coming into force is to allow receiver produce a kind of " eyesight ", makes that receiving each uses channel true.Receiver should be collected as the necessary data of decision intelligently, so that adjudicate, and only just works when collecting enough data.
In the embodiment shown in fig. 7, be switched on (or in wait state then immediately) in 10 seconds, privacy device gives about key for about deciphering of giving in succession.Unless receiver came into force at that time, otherwise just do not emit this key.But it is irrelevant with the process that comes into force that about key is given in derivation.If can untie the secrecy provision of the integrated circuit of forming this function, that just might design other circuit, sort circuit do not need to come into force judgement and unconditionally emit and give about key.
Though existing privacy device extremely difficulty duplicates, also obviously might give away secrets, for avoiding its generation, design a kind of circuit diagram.Design is used for transmitting the arbitrary equipment that gives about key, no matter have or be not with judgements that come into force, all must use distribution key D(on the whole to be obtained by a privacy device of insertion).If find to comprise the illegal receiver of specific distribution key, leave a bond energy at least at all other decoders and enough give under the condition of about key deciphering, can remove the encryption that phase should about key from allocated channel.Can do like this, promptly from 3000 keys, select 4 keys and offer each decoder, rather than make two decoders have 4 keys of same group.Select 4 different keys from 3000 and have 3.3 * 10
12Individual style.For any one decoder, utilize and to forbid that its 4 encryptions give about key, keep the key of working in all other (2,000 ten thousand), can eliminate all and duplicate.If second decoder is replicated, then do not need any cost can forbid all duplicating, this quadrat method can be got rid of nearly 10 decoders.After this, as forbidding again, will make some legal decoder become forbidden.These decoders (having with the user) can be at transmitter terminal by software prediction in addition, duplicates in order to forbid all of 20 different decoders in 2,000 ten thousand scopes simultaneously, only needs to replace 10 legal decoders.
Referring to Fig. 8, block diagram illustrates an example that can be used to realize decoder of the present invention.No. 507,565, the U.S. Patent application that the company that another embodiment of this decoder applied in June 24 nineteen eighty-three transfers the possession of, title is for being described in " encryption and decryption of vision signal ", here as a reference.
As shown in Figure 8, the MAC TV signal of having encrypted at first enters multiplexer 300, and signal is told brightness and colourity (being chrominance component) signal thus, and sound, synchronously, regularly and arbitrary teletext information.Luminance signal is sent to luminance memorizer 302, and it is the CCD(charge coupled device) line storage, go compression at this, be added to low pass filter 304 then and carry out filtering.After this, analog luminance signal is delivered to output interface 306.In timing generator 308, produce brightness is removed to compress required sampled signal,, it is added in the luminance memorizer 302 with two clock drivers 310.
In colourity memory 312, also the carrier chrominance signal of demultiplexer 300 being gone to compress 312 also is the CCD line storage, provides output respectively to two color difference signals, carries out filtering through two low pass filters 314, is added to output interface 306 then., through three clock drivers 310 sampled signal that needs is added in the colourity memory 312 from timing generator 308.
By demultiplexer 300, from the MAC TV signal, also isolate the signal that does not constitute brightness or colourity.These signals comprise sound, teletext and synchronizing signal, by one of two low pass filters 318, send it in the demultiplexer 316.In addition, by band pass filter 320, the fixed frequency timing signal is sent in the demultiplexer 316.Demultiplexer 316 is isolated these signals, and sound is delivered to voice signal separator 322, and synchronous and timing signal are delivered to clock and synchronization recovery circuit 324 and timing generator 308.By the acoustic information of demultiplexer 316, in voice signal separator 322, be divided into 4 the tunnel, and by 326 outputs of simulated sound processor.By clock and synchronization recovery circuit 324, teletext information is delivered to character generator 328.Decoder functions is subjected to the control of microprocessor 330, and 330 by bidirectional bus 334,336 and 338, with clock and synchronization recovery circuit 324, and teletext character generator 328 and RAM(random access memory) communication.
The present invention has been done to be described in detail in conjunction with the preferred embodiments.But these embodiment only are a little examples, and invention is not limited to this.Those skilled in the art can recognize after reading specification, in the defined scope of the invention of accessory claim, can make various changes and modification.
Claims (37)
1, for descrambling and/or decryption information, a kind of equipment to code encryption is characterized in that comprising:
The first encryption key device of first encryption key is provided;
The second encryption key device of second encryption key is provided;
Encrypt first encryption device of described second encryption key according to described first encryption key;
According to second encryption device of described second encryption key to described code encryption, second encryption key of having encrypted and the sign indicating number of having encrypted are used for descrambling and/or decipher described information.
2, according to the equipment of claim 1, wherein information is the message part of TV signal.
3, according to the equipment of claim 2, the sign indicating number that wherein is used for descrambling and/or deciphering television signal information part comprises a plurality of keys.
4, according to the equipment of claim 2, it is characterized in that further comprising, second encryption key of having encrypted and the sign indicating number encrypted, send the transmitting device of the receiver of received television signal to.
5, according to the equipment of claim 4, wherein transmitting device is the television transmitter of transmitting television signals.
6, according to the equipment of claim 1, wherein sign indicating number is a periodically-varied.
7, according to the equipment of claim 1, wherein first encryption key is a periodically-varied.
8, for descrambling and/or decryption information, to a kind of equipment of sign indicating number deciphering, wherein said sign indicating number is to encrypt according to first encryption key of having encrypted, and equipment is characterised in that and comprises:
The decryption key device of first decryption key is provided;
Be used for deciphering first decryption device of the encryption key of having encrypted according to decryption key;
For descrambling and/or decryption information, decipher second decryption device of described sign indicating number according to encryption key.
9, equipment according to Claim 8, wherein information is the message part in the TV signal.
10, according to the equipment of claim 9, wherein for the message part of descrambling and/or deciphering TV signal, described sign indicating number comprises a plurality of keys.
11, for descrambling and/or decryption information and in order to decipher described sign indicating number to a system of code encryption, it is characterized in that comprising:
The first encryption key device of first encryption key is provided;
The second encryption key device of second encryption key is provided;
Encrypt first encryption device of second encryption key according to first encryption key;
Encrypt second encryption device of described sign indicating number according to second encryption key;
The first decryption key device of first decryption key is provided;
Decipher first decryption device of second encryption key of having encrypted according to first decryption key;
For descrambling and/or decryption information, according to second decryption device of the described sign indicating number of second decryption key deciphering.
12, according to the equipment of claim 11, wherein said information is the message part of TV signal.
13, according to the equipment of claim 12, wherein for the message part of descrambling and/or deciphering TV signal, described sign indicating number comprises a plurality of keys.
14, according to the equipment of claim 12, it is characterized in that further comprising, for second encryption key of having encrypted and the sign indicating number encrypted, be transferred to the transmitting device of the receiver of received television signal.
15, according to the equipment of claim 14, wherein transmitting device is the television transmitter of transmitting television signals.
16, according to the equipment of claim 11, wherein said sign indicating number is a periodically-varied.
17, according to the equipment of claim 11, wherein first encryption key is a periodically-varied.
18, for descrambling and/or decryption information and, it is characterized in that comprising the steps: to a kind of method of code encryption
First encryption key is provided;
Second encryption key is provided;
According to first encryption key, encrypt second encryption key;
Encrypt described sign indicating number according to second encryption key, second encryption key of having encrypted and described yard of having encrypted are used for descrambling and/or decipher described information.
19, according to the method for claim 18, it is characterized in that further comprising, second encryption key of having encrypted and the described sign indicating number encrypted, be transferred to the step of the receiver of received television signal.
20,, it is characterized in that further comprising the step of the described sign indicating number of periodically-varied according to the method for claim 18.
21,, it is characterized in that further comprising the step of periodically-varied first encryption key according to the method for claim 18.
22, decipher a kind of method of described sign indicating number for descrambling and/or decryption information, wherein encrypt described sign indicating number according to first encryption key of having encrypted, described method is characterised in that and comprises the steps:
A decryption key is provided;
According to first decryption key, first encryption key that deciphering has been encrypted;
For descrambling and/or decryption information, decipher described sign indicating number according to first encryption key.
23, scrambling and go to disturb a kind of method of following type line scan television signal, at interval and do not have second time interval of video information described method was characterised in that and comprised the steps: the very first time that promptly exists video information in every row
According to the video scrambling sign indicating number, the scrambling video information;
Be the video information of the described scrambling of descrambling, the video descrambling code is provided;
According to first encryption key, the encrypted video descrambling code;
Video scrambling sign indicating number for deciphering has been encrypted provides and gives about key;
According to second encryption key, encrypt and give about key;
In second time interval of TV signal, (do not have video information in the interbody spacer at this moment), comprise the video descrambling code of having encrypted and encrypted give about key;
In the receiver of received television signal, the distribution key is provided, this distribution key is used for the about key deciphering of giving of having encrypted, and about key that gives of having deciphered is used for deciphering the video descrambling code of having encrypted, and the video descrambling code of having deciphered is used for the descrambling video information of scrambling.
24, according to the method for claim 23, wherein provide the step of giving about key, comprise from first encryption key deriving the step of giving about key.
25, according to the process of claim 1 wherein that providing the distribution key to comprise from second encryption key to receiver derives the step of distributing key.
26, according to the method for claim 23, wherein, provide a step of giving about key at least, be included as each receiver of received television signal, unique about key that gives is provided.
27, according to the method for claim 4, wherein, provide the step of distributing key to be included as each unique about key that gives the step of distributing key is provided.
28, according to the process of claim 1 wherein that giving about key and distributing key is periodically-varied.
29, a kind of method of the following type line scan television of scrambling and not scrambling signal, at interval and do not have second time interval of video information described method was characterised in that and comprised the steps: the very first time that promptly exists video information in every row
According to video scrambling sign indicating number scrambling video information;
For the video information of descrambling scrambling provides the video descrambling code;
According to the first encryption key encrypted video descrambling code;
For providing, the video descrambling code encrypted of deciphering gives about key;
Give about key according to the encryption of second encryption key;
In second time interval of described TV, (do not have video information in the interbody spacer at this moment), comprise the video descrambling code of having encrypted and encrypted give about key; And
Subscriber code and retainingf key are provided for the receiver of received television signal, this subscriber code and retainingf key are used for deriving the distribution key, this distribution key is used for deciphering about key that gives of having encrypted, about key that gives of having deciphered is used for deciphering the video descrambling code of having encrypted, and the video descrambling code of having deciphered is used for the descrambling video information of scrambling.
30, according to the method for claim 29, wherein provide the step of giving about key, comprise from the derivation of first encryption key and give about key.
31, according to the method for claim 29, wherein giving about key is periodically-varied.
32,, wherein provide the step of subscriber code and retainingf key to comprise that each is the receiver of received television signal, provides unique subscriber code according to the method for claim 29.
33, a kind of method of the following type line scan television of scrambling and not scrambling signal, at interval and do not have second time interval of video information described method was characterised in that and comprised the steps: the very first time that promptly exists video information in every row
According to video scrambling sign indicating number scrambling video information;
For the video information of descrambling scrambling provides the video descrambling code;
According to the first encryption key encrypted video descrambling code;
A plurality of sign indicating numbers that come into force are provided, and concerning the receiver of each received television signal, each in a plurality of sign indicating numbers that come into force all is unique;
Give about key according to the encryption of second encryption key;
In second time interval of TV signal (not having video information in the interbody spacer at this moment), the video descrambling code encrypted of transmission, that has encrypted gives about key and a plurality of sign indicating number that comes into force; And
The distribution key is provided for the receiver of received television signal, utilize the distribution key to decipher about key that gives of having encrypted, about key that gives of having deciphered is used in each receiver deriving the inside sign indicating number that comes into force, the inner sign indicating number that comes into force of deriving compares with a plurality of sign indicating numbers that come into force, comparator provides a logical signal indication when adaptive, logical signal start-up logic device, the about key that gives that makes it to allow to have deciphered removes to decipher the video descrambling code of having encrypted, and the video descrambling code of having deciphered is used for the descrambling video information of scrambling.
34,, wherein provide the step of giving about key to comprise and give about key from the derivation of first encryption key in order to decipher the video descrambling code of having encrypted according to the method for claim 33.
35, according to the method for claim 33, wherein, provide the step of distributing key to comprise to receiver and derive the distribution key from encryption key.
36, according to the method for claim 33, wherein, provide the step of distributing key to receiver, being included as each receiver provides the distribution key adaptive unique about key that gives.
37, according to the method for claim 33, wherein giving about key and distributing key is periodically-varied.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US73759985A | 1985-05-24 | 1985-05-24 | |
| US737,599 | 1985-05-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN86103053A true CN86103053A (en) | 1986-11-19 |
Family
ID=24964519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN198686103053A Pending CN86103053A (en) | 1985-05-24 | 1986-05-03 | The method and apparatus of scrambling and descrambling TV signal |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0222818A1 (en) |
| JP (1) | JPS62503066A (en) |
| CN (1) | CN86103053A (en) |
| AU (1) | AU5812086A (en) |
| WO (1) | WO1986007224A1 (en) |
| ZA (1) | ZA862839B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1312877C (en) * | 2000-02-17 | 2007-04-25 | 微软公司 | System and method for protecting data streams in hardware components |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4792972A (en) * | 1986-08-19 | 1988-12-20 | Scientific-Atlanta, Inc. | Remote programming of CATV channel authorization unit |
| US4864615A (en) * | 1988-05-27 | 1989-09-05 | General Instrument Corporation | Reproduction of secure keys by using distributed key generation data |
| US5029207A (en) * | 1990-02-01 | 1991-07-02 | Scientific-Atlanta, Inc. | External security module for a television signal decoder |
| GB9003325D0 (en) * | 1990-02-14 | 1990-04-11 | Enfranchise Sixty Ltd | Apparatus and method for controlling access to broadcast signals |
| US5872846A (en) * | 1996-11-07 | 1999-02-16 | Mci Communications Corporation | System and method for providing security in data communication systems |
| JPH10301492A (en) | 1997-04-23 | 1998-11-13 | Sony Corp | Enciphering device and method therefor, decoding device and method therefor, and information processing device and method therefor |
| DE19726003A1 (en) * | 1997-06-19 | 1998-12-24 | Alsthom Cge Alcatel | Method for transmitting encrypted signals, and transmitting device and receiving device therefor |
| US6697489B1 (en) * | 1999-03-30 | 2004-02-24 | Sony Corporation | Method and apparatus for securing control words |
| US7039614B1 (en) | 1999-11-09 | 2006-05-02 | Sony Corporation | Method for simulcrypting scrambled data to a plurality of conditional access devices |
| US8121296B2 (en) | 2001-03-28 | 2012-02-21 | Qualcomm Incorporated | Method and apparatus for security in a data processing system |
| US9100457B2 (en) | 2001-03-28 | 2015-08-04 | Qualcomm Incorporated | Method and apparatus for transmission framing in a wireless communication system |
| US7352868B2 (en) | 2001-10-09 | 2008-04-01 | Philip Hawkes | Method and apparatus for security in a data processing system |
| US7649829B2 (en) | 2001-10-12 | 2010-01-19 | Qualcomm Incorporated | Method and system for reduction of decoding complexity in a communication system |
| EP1418750A1 (en) | 2002-11-11 | 2004-05-12 | STMicroelectronics Limited | Security integrated circuit |
| US7599655B2 (en) | 2003-01-02 | 2009-10-06 | Qualcomm Incorporated | Method and apparatus for broadcast services in a communication system |
| US8098818B2 (en) | 2003-07-07 | 2012-01-17 | Qualcomm Incorporated | Secure registration for a multicast-broadcast-multimedia system (MBMS) |
| US8718279B2 (en) | 2003-07-08 | 2014-05-06 | Qualcomm Incorporated | Apparatus and method for a secure broadcast system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4388643A (en) * | 1981-04-06 | 1983-06-14 | Northern Telecom Limited | Method of controlling scrambling and unscrambling in a pay TV system |
| US4484027A (en) * | 1981-11-19 | 1984-11-20 | Communications Satellite Corporation | Security system for SSTV encryption |
| US4531020A (en) * | 1982-07-23 | 1985-07-23 | Oak Industries Inc. | Multi-layer encryption system for the broadcast of encrypted information |
-
1986
- 1986-04-16 ZA ZA862839A patent/ZA862839B/en unknown
- 1986-04-21 JP JP61502563A patent/JPS62503066A/en active Pending
- 1986-04-21 AU AU58120/86A patent/AU5812086A/en not_active Abandoned
- 1986-04-21 WO PCT/US1986/000801 patent/WO1986007224A1/en not_active Application Discontinuation
- 1986-04-21 EP EP86902982A patent/EP0222818A1/en not_active Withdrawn
- 1986-05-03 CN CN198686103053A patent/CN86103053A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1312877C (en) * | 2000-02-17 | 2007-04-25 | 微软公司 | System and method for protecting data streams in hardware components |
Also Published As
| Publication number | Publication date |
|---|---|
| AU5812086A (en) | 1986-12-24 |
| JPS62503066A (en) | 1987-12-03 |
| ZA862839B (en) | 1986-12-30 |
| EP0222818A1 (en) | 1987-05-27 |
| WO1986007224A1 (en) | 1986-12-04 |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |