KR0185987B1 - Scramble/descramble apparatus - Google Patents

Abstract

The present invention relates to a scrambled / descrambled device, wherein a general scrambled / descrambled device has a method of transmitting to a receiver through encryption of program data by a Serviskyi signal and encryption of individual information by a receiver unique keyed signal. As a result, if only the bibiskyi and the recipient unique key is found, the data is decrypted and illegal programs can be viewed. In order to compensate for this, the present invention is provided with a scrambling pattern signal generator and a control word generator, and then mixed with the surby and the scramble key in the control word generator, the form of the original scramble key signal can not be recognized even though the form of the original scramble key signal A control word containing information is generated, and the generated control word is used to generate cut point data for scrambling the original signal by the generated control word, thereby preventing illegal viewing.

Description

Scramble / Descramble Device

1 is a configuration diagram of a conventional scramble device,

(a) is a block diagram of the scrambler on the transmitting side,

(b) is a block diagram of the descrambler on the receiving side.

2 is a configuration diagram of the scrambler of the present invention,

(a) is a block diagram of the scrambler on the transmitting side,

(b) is a block diagram of the descrambler on the receiving side.

* Explanation of symbols for main parts of the drawings

1: scrambler 2, 11: scrambling pattern signal generator

3, 12: control word generator 4, 5, 6: encryption device

7: subscriber information group 8: signal synthesizer

9: signal separator 10: descrambler

3, 14, 15: decoder 16: data comparison combiner

17: transfer machine

The present invention relates to the scrambling of a television receiver to prevent illegal viewing, and in particular, when a specific subscriber transmits an encrypted subscriber group key and a subscriber's own key so that only a specific subscriber is provided with a program service, the subscriber's own key is received from the receiver. The present invention relates to a scramble / descrambling device for decryption recovery using the same.

The conventional scrambler for preventing illegal viewing is a scrambler (Privacy) of the original signal (SS) by the scramble key signal (KS) applied from the input terminal, as shown in FIG. 1) and; An encryptor (2) for encrypting the program data (PD) by the surby key signal (WK) output from the information key group (5); An encryptor (3) for encrypting the individual information signal (KJP) output from the information key group (5) in accordance with the receiver unique key signal (kmp) output from the receiver unique key group (4); A signal synthesizer 6 for synthesizing and transmitting the original signal (eSS) encrypted from the scrambler (1) and the program data (ePD) and the individual information signal (eKJP) encrypted and output from the encryptor (2) (3); ; A signal separator (7) which receives the synthesized signal transmitted from the signal synthesizer (6) and separates each of them; A decoder (10) for decoding and restoring the individual information signal (eKJP) separated and output from the signal branching unit (7) by the receiver unique key signal (Kmp) generated from the receiver unique key generation unit (1); A decoder (9) for decoding and restoring program data (ePD) separated and output from the signal separator (7) by the service key signal (WK) included in the individual information signal (KJP) of the decoder (10); An information comparator (12) for comparing the program data (PD) restored from the decoder (9) and the individual information signal (KJP) recovered from the decoder (10) and generating a control signal when the conditions match; A switching unit (13) for switching on / off in accordance with the control signal of the information comparator (12) to switch the scramble key signal (KS) configured in the program data (PD); It consists of a descrambler 8 for restoring the encrypted signal eSS separated from the signal separator 7 by the scramble key signal KS through the switch 13 to the original signal SS. have.

Referring to the operation of the conventional scramble device configured as described above and the problems as follows.

When the original signal SS to be viewed is applied to the scrambler 1, the scrambler 1 scrambles the original signal SS by the scramble key signal KS included in the program data PD. The original signal eSS scrambled to the synthesizer 6 is outputted, and the program data PD is encrypted by the encryptor 2 by the sub-biskey signal WK selected and output from the information key group 5. Output to the signal synthesizer 6 as encrypted program data ePD, while the individual information signal KJP output from the information key group 5 is selected and output from the receiver unique key group 4 (Kmp) is encrypted by the encryptor 3 and output to the signal synthesizer 6 as an encrypted individual information signal eKJP.

Accordingly, the signal synthesizer 6 synthesizes the original signal eSS and the program data ePD and the individual information signal eKJP, which are encrypted and output from the scrambler 1 and the encryptor 2, 3, and then transmitted. The signal separator 7 on the receiving side receives the encrypted original signal (eSS), the program data (ePD) and the individual information signal (eKJP) synthesized and transmitted by the signal synthesizer 6 on the transmitting side, and separates them. After that, it outputs to the decoders 9 and 10 of each descrambler 8.

Accordingly, the decoder 10 decodes the encrypted individual information signal eKJP, which is separated from the signal separator 7 by the receiver unique key signal Kmp output from the receiver unique key generation unit 11, and decodes the original. The decoder 9 restores the individual information signal KJP, and the decoder 9 separates and outputs the encrypted program data ePD by being separated from the signal separator 7 by the surby key signal WK included in the individual information signal KJP. ) Is restored to the original program data PD, and the information comparator 12 compares the program data PD restored from the decoders 9 and 10 and the individual information signal KJP. The same surface control signal is output to turn on the switching machine 13.

Therefore, the scrambler key signal KS constituted in the program data PD of the decoder 9 is applied to the descrambler 8 through the switch 13, so that the descrambler 8 receives the signal separator 7. Then, the encrypted signal eSS, which is separated and outputted, is decoded and restored to the original signal SS.

However, such a conventional scramble / descramble device has a method of transmitting to the receiver through the encryption process of the individual information by the receiver unique key of the encryption of the program data by the Serviskyi signal, so that the Servisky and the receiver unique key If only the data is decrypted, illegal program viewing is possible, and the supplementary weakness is weak, and since the common key is not used in the data processing, the transmission time of the Serviskyi signal is greatly increased according to the number of subscribers. Had a problem that could not be transmitted in a short time.

In view of such a conventional problem, the present invention includes all the information of the original scrambled key signal without being able to recognize the form of the original scrambled key signal by mixing in the control word generator. After generating the control word to generate a cut point for scrambling the original signal in the pattern signal generator by the generated control word to prevent illegal viewing, the invention is attached to the following When described in detail based on one drawing is as follows.

FIG. 2 is a block diagram of the scramble / descramble device of the present invention. As shown therein, the control word CW is generated by mixing the scramble key signal KS and the Serbisby key signal WK applied from an input terminal. A control word generator 3; A scrambling pattern signal generator (2) for generating cut point data by mixing the control word (CW) output from the control word generator (3) and the scramble key signal (KS) input from an input terminal; A scrambler (1) for arbitrarily cutting and sparking the original signal (SS) input from the input terminal by the cut point data output from the scrambling pattern signal generator (2);

An encryptor (4) which mixes and encrypts the program data (PD) and the control word (CW) of the control word generator (3) by means of the surby key signal (WK) inputted from the input terminal; An encryption unit for mixing and encrypting the Serbiskiey signal (WK) and the personal information signal (CE) selected and output from the subscriber information group (7) by mixing the information group common key signal (GK) output from the subscriber information group (7); 5) and; An encryptor (6) for encrypting the information group common key signal (GK) outputted from the subscriber information group (7) by the receiver unique key signal (UKT); The original signal (eSS) encrypted from the scrambler (1) and the Serviskyi signal (eWK), the personal information signal (eGK), and the recipient unique key signal (eUKT) encrypted from the encryptor (4) (5) (6). A signal synthesizer 8 for synthesizing and transmitting; A signal separator (9) which receives the synthesized signal transmitted from the signal synthesizer (8) and separates each of them; The original information group common key is formed by configuring a scrambler, decoding the receiver unique key signal eUKT separated from the signal separator 9 of the scrambler by the receiver unique key signal UKR held by the receiver. A decoder 15 for restoring this signal GK; The information group common key signal eGK separated and output from the signal separator 9 by the information group common key signal GK restored from the decoder 15 is decoded and the surby key signal WK and the personal information signal ( A decoder 14 for restoring to CE); A decoder (13) for decoding the subby-sky signal (eWK) separated from the signal separator (9) and restoring the original program data (PD) and the control word (CW); A data comparator (16) for comparing the program data (PD) restored from the decoders (13) and (14) and the personal information signal (CE) and outputting a control signal corresponding thereto; A control word generator (12) for generating a control word (CW) by synthesizing the subscribing key signal (WK) restored from the decoder (14) and the scramble key signal (eKS) separated from the signal separator (9); A switching unit (17) for selecting the control word (CW) restored from the control word generator (12) and the decoder (13) according to the output control signal of the data comparison combiner (16); A scrambling pattern signal generator (11) for generating cut point data by synthesizing the control word (CW) selected from the switching unit (17) and the scramble key signal (eKS) of the signal separator (9); A descrambler (10) for descrambling the original encrypted signal (eSS) of the signal separator (9) by the cutpoint data output from the scrambling pattern signal generator (11); Configure a descramble device.

Referring to the operation, effects of the present invention configured as described above in detail.

First, when the scramble key signal KS and the subby-sky key signal WK are applied from the input terminal, the control word generator 3 generates the control word CW by mixing them, and the generated control word CW is input. The scrambling pattern generator 2 is mixed with the scramble key signal KS input from the terminal to output arbitrary cutpoint data to the scrambler 1.

Therefore, the scrambler 1 arbitrarily cuts and scrambles the original signal SS input from the input terminal by the cut point data of the scrambling pattern signal generator 2, and then encrypts the signal eSS encoded by the signal synthesizer 8. And the control word CW generated from the viewable program data PD and the control word generator 3 is encrypted by the encryptor 4 by the Serbisubishi signal WK applied from the input terminal. The signal synthesizer 8 is output as an encrypted Serviskyi signal (eWK), the Serviskyi signal (WK) applied from the input terminal and the personal information signal (CE) output from the subscriber information group 7 is the subscriber information The information group common key signal GK output from the group 7 is encrypted by the encryptor 5 and then output as an encrypted information group common key signal eGK to the signal synthesizer 8.

On the other hand, the information group common key signal (GK) output from the pressurizer information group (7) is encrypted by the encryptor (6) by the receiving party's unique key signal (UKT) on the transmitting side so that it cannot be decrypted by a third party. Thereafter, the signal synthesizer 8 outputs an encrypted receiver unique key signal eUKT.

Accordingly, the signal synthesizer 8 is the original signal (eSS) and the Serviskyi signal (eWK) and the information group common key signal (eGK) which are encrypted and output from the scrambler (1) and the encryptor (4) (5) (6). And a receiver unique key signal (eUKT) is synthesized and transmitted, and the signal separator 9 on the receiving side is a scramble key signal other than the original encrypted signal eSS synthesized and transmitted by the signal synthesizer 8 on the transmitting side. eKS), the Serviskyi signal (eWK), the information group common key signal (eGK) and the receiver unique key signal (eUKT) are received and separated, respectively, each descrambler 10, scrambling pattern signal generator 11, The control word generator 12 and the decoders 13, 14, and 15 are outputted.

Accordingly, the decoder 15 decrypts the encrypted receiver unique key signal eUKT of the sender separated from the signal separator 9 by the receiver unique key signal UKR held by the receiver. This signal GK is restored, and the decoder 14 decodes the encrypted information group key signal eGK of the signal separator 9 by the restored information group key signal GK, thereby recovering the original surby key signal WK. And the personal information signal CE, and the decoder 13 decodes the Serviskyi signal eWK, which is separated and output from the signal separator 9, to decode the original program data PD and the control word CW. Is restored to the fixed terminal (a) and the data comparison combiner (16) of the switching device (17), and the scramble key of the Serviskyi signal (WK) and the signal separator (9) restored from the decoder (14). This signal eKS is transmitted to the control word generator 12. By mixing, the control word CW is output to the fixed terminal b of the switch 17.

At this time, the data comparator 16 compares the program data PD output from the decoders 13 and 14 and the personal information signal CE to control the operation terminal M of the switching unit 17 if the same. It is connected to the fixed terminal a of the switching machine 17, and if it is not the same, it is connected to the fixed terminal b of the switching machine 17.

That is, when the subscriber on the receiving side recognizes the program data PD, the control word generator outputs the control word CW by combining the scramble key signal eKS and the surby key signal WK transmitted from the transmitting side. (12), if the subscriber on the receiving side does not know the program data PD on the transmitting side, the control word CW restored from the decoder 13 is selected and outputted to the scrambling pattern signal generator 11 so that the scrambling is performed. The pattern signal generator 11 mixes with the scramble key signal eKS output from the signal separator 9 to output arbitrary cut point data.

Accordingly, the descrambler 10 outputs the recovered descrambled signal DS after arbitrarily cutting the original signal eSS of the signal separator 9 by arbitrary cut pointer data.

As described in detail above, according to the present invention, the viewable program data and the control word are encrypted by Serbiskyi, the Serbiskyi and personal information are encrypted by a group key, and the group key is transmitted to each receiver on the transmitting side. Encrypting by the unique key greatly enhances the security, and also has the effect of encrypting the data using a common key and increasing transmission efficiency through group-by-group transmission.

Claims (2)

In a scramble device for restoring a data scrambled by a scramble key and a survivor's original key by a receiver's unique key on the receiving side, the scramble key signal KS and the surby key signal WK are mixed to control a word. A control word generator 3 for generating CW); A scrambling pattern signal generator (2) for generating cut point data by mixing the output signal of the control word generator (3) and the scramble key signal (KS); A scrambler (1) for arbitrarily cutting and secreting the original signal (SS) by the cutpoint data; An encryptor (4) which mixes and encrypts the program data (PD) and the control word (CW) of the control word generator (3) by the surby key signal (WK); An encryptor (5) for mixing and encrypting the surby quay signal (WK) and the personal information signal (CE) by an information group common key signal (GK); An encryptor (6) for encrypting the information group common key signal (GK) by a receiver unique key signal (UKT); The scrambler characterized in that the scrambler (1) and the signal synthesizer (8) for transmitting the encrypted signal through the signal separator 9 by synthesizing the output signal of the encryptors (4), (5), (6) Device. A decoder 15 for restoring the receiver unique key signal eUKT from the scrambler to the original information group common key signal GK by the receiver unique key signal UKR held by the receiver; A decoder 14 which decodes the information group common key signal eGK separated and output from the scrambler by the information group common key signal GK, and restores the original group information signal WK and the personal information signal CE. )Wow; A decoder (13) which decodes the surby key signal (eWK) of the scrambler and restores the original program data (PD) and the control word (CW); A data comparator (16) for comparing the program data (PD) of the decoders (13) and the personal information signal (CE) and outputting a control signal according thereto; A control word generator (12) for generating a control word (CW) by combining the surby key signal (WK) and the scramble key signal (eKS) of the scramble device; A switching unit (17) for selecting a control word (CW) of the control word generator (12) and the decoder (13) according to the output control signal of the data comparison combiner (16); A scrambling pattern signal generator (11) for generating cut point data by synthesizing the control word (CW) of the switching device (17) and the scramble key signal (eKS) of the scramble device; And a descrambler (10) for descrambling the original signal (eSS) encrypted by the cutpoint data.