TH73702A - Methods for verifying accuracy and completeness of information for local digital networking keys. - Google Patents

Abstract

DC60 (29/09/46) The purpose of this invention is to present a method for controlling the uniformity of link network keys (NKs). This method is used when transferring or moving data originating from an accessible data source, when the access conditions are correct, to a link network for a residence. The method serves to verify the validity of the link network key (NK) data, ensuring it has the correct authorization, using specific relevant control information provided by the validation center, typically in the form of an account list {(TK)NKI, (TK)NK2, (TK)NK3...}. Verification of the presence or absence of the (TK)NK data is performed according to the account list {(TK)NKI, (TK)NK2, (TK)NK3...}. The (TK)NK data, composed of test keys (TKs) provided by the validation center, is encrypted by the link network key (NK) of the security module (CT) of a particular instrument (TV1, TV2, PC) connected to that network. The purpose of this invention is to present a method for controlling the uniformity of network link keys (NKs). This method is used when transferring or moving data from an accessible data source, provided the access conditions are correct, to a network link for a residential address. The method verifies the validity of the network link key (NK) using specific relevant control information provided by the validation center, typically in the form of a list {(TK)NKI, (TK)NK2, (TK)NK3...}. Verification of the presence or absence of the (TK)NK is performed according to the list {(TK)NKI, (TK)NK2, (TK)NK3...}. The (TK)NK, composed of test keys (TKs) provided by the validation center, is encrypted by the network link key (NK) of the security module (CT) of a device (TV1, TV2, PC) connected to that network.

Claims (16)

1. The method for verifying the validity and integrity of data for the network link key (NK) in a residential digital network system consists of at least one transmission instrument (STB, LDVD) and one processing instrument (TV1, TV2, PC). The transmission instrument (STB, LDVD) containing the encrypted data (DT) is transmitted to the processing instrument (TV1, TV2, PC). This data can be easily used by the processing instrument, which is an advantage obtained because the network link key (NK) is not known by the transmission instrument (STB, LDTV). The method consists of the following steps: - Transmission of the test key (TK) by the transmission instrument (STB, LDVD) to the processing instrument (TV1, TV2, PC). - Calculation of the cryptographic code (TK NK) by the processing instrument (TV1, TV2, PC) resulting from the key. Used for testing (TK). The key is encrypted using the network link key (NK). The TK NK is transmitted to the relay device (STB, LDVD). The validity of the network link key (NK) is checked by the relay device (STB, LDVD) by comparing the TK NK to a list of control keys {(TK)NK1, (TK)NK2, (TK)NK3}. 2. The method for verifying the data according to claim 1 exhibits the unique characteristic that the test key (TK) and the list of control keys {(TK)NK1, (TK)NK2, (TK)NK3,} together constitute the control data and are generated in the verification center and transferred or moved in a transmission device (STB, LDVD). 3. The method for verifying the data according to Claim 1 exhibits a unique characteristic in that the test key (TK) is determined by the transmission instrument, while the list of control keys {(TK)NK1, (TK)NK2, (TK)NK3 ...} is calculated by the transmission instrument based on a database of predefined lists of network keys (NK1, NK2, NK3,...). These are then transmitted by the verification center and combined to form the control data. Each control key (TK NKn) is the result of encoding the predefined network key (NKn) with the test key (TK). 4. The method of verifying the data according to claim 3 exhibits a unique feature in that the test key (TK) is generated randomly and can also be used as a time-limited key (SK) for encrypting the encrypted data (DT). 5. The method of data validation under claim 4 or 3 exhibits the following characteristics: the transmission instrument generates at least two units of test keys (TK1, TK2, TKn) and transmits them signally to the processing instrument (TV1, TV2, PC), which then returns the corresponding cryptographic key (TKINK) along with its associated test key (TKI) for data validation and another cryptographic key (TK2NK) along with its associated test key (TK2) as the time-limited key (SK) for encrypting the data (DT). 6. The method for verifying the data according to claims 2 through 5 exhibits a unique characteristic in that the list of cryptographic keys used for control consists of a blacklist {(TK)NK1, (TK)NK2, (TK)NK3 ...} containing cryptographic keys obtained by encrypting the test key (TK) with the network link keys (NK1, NK2, NK3,...) which are invalid. 7. Method of Data Validation. Claims 2 through 5 demonstrate the special characteristic d in that the list of cryptographic keys used for control consists of a whitelist {(TK)NK1, (TK)NK2, (TK)NK3 ...} containing cryptographic keys (TK)NK obtained by encrypting the test key (TK) with the non-voidable network key (NK1, NK2, NK3,...). 8. Data validation method according to claim 6 or 7 shows special characteristics in the event that the secret code (TK) NK appears in the blacklist or is not in the whitelist and is rejected during comparison. A warning signal and recommendation for the user to change the junction station (CT) module will be generated. 9. The method of data validation, as described in one of the preceding claims, demonstrates a special characteristic in which the transmission instrument comprises a single signal conversion (CC) module responsible for data validation. 10. The method of verifying the data according to one of the preceding claims demonstrates a special characteristic in which the processing unit consists of a junction station (CT) module for recording the link network key (NK). 11. Method of data validation. According to claim 9, a special characteristic is shown in which the control accounts {(TK)NK1, (TK)NK2, (TK)NK3 . . .} are recorded in the memory of the instrument for transmission or broadcasting (STB, LDVD). Comparison with the secret code (TK) NK is performed by this instrument. 12. Method of Data Validation. Claims 3 through 10 demonstrate the special characteristic that the controlled data consists of addresses that can identify the control accounts {(TK)NK1, (TK)NK2, (TK)NK3 ...} and can be transmitted via the internet from any location using a transmission or broadcasting device. The accounts {(TK)NK1, (TK)NK2, (TK)NK3 ...} mentioned above are then recorded in the memory of the transmission device (STB, LDVD). 13. Data Validation Method: Claims 3 through 12 demonstrate a unique characteristic in which the Switching Control (CC) module verifies the validity of the control account by accepting the unique symbol of such data. 14. The method for verifying the data according to claim 1 demonstrates the unique characteristic that the control accounts {(TK)NK1, (TK)NK2, (TK)NK3 . . .} are recorded by the verification center, with a tool for transmitting cryptographic signals to the said center for further data verification. 15. Method of verifying the data according to claims 3 through 11 shows the special characteristic that the transmission instrument is a DVD reader on this disc, consisting partly of encoded data (DT) and partly of control data. 16. Methods for verifying data accuracy, as per claims 3 through 14, demonstrate the special characteristic that the transmission equipment is a decoder of paid television programs, receiving encrypted data and control information from a central control center.