TH48092A - Methods and systems for transmitting decrypted information - Google Patents

Abstract

DC60 (09/04/44) While doing multichannel broadcasting to a paid television, each channel is connected to an Authorization Message (ECM) which allows decoding of this information as a right. Of service members When changing channels Very little time is allowed before the user Have canceled these new rights in relation to new channels. Several encryption algorithms have been broken down to eliminate this barrier. To decode the channel Therefore, a system that uses a combination of Authorization for a particular channel (ECM), which is decoded with a fast algorithm with authorization messages (MECM) for a group of channels. The latter case is encrypted with The highly secure method has decryption delays. While multichannel broadcasting to a paid television, each channel is connected to an Authorization Message (ECM) which allows its right to decode this information. Of service members When changing channels Very little time is allowed before the user Have canceled these new rights in relation to new channels. Several encryption algorithms have been broken down to eliminate this barrier. To decode the channel Therefore, a system that uses a combination of Authorization for a particular channel (ECM), which is decoded with a fast algorithm with authorization messages (MECM) for a group of channels. The latter case is encrypted with The highly secure method has decryption delays.

Claims (9)

1.Multi-channel encrypted data transmission system for paid phones. The system consists of at least one admin center and subscriber unit.The management center performs encrypted transmissions and sends a single channel authorization message (ECM) for each channel. The system is in such a way that it consists of multi-signal authorization messages (MECMs) that are common to various channel groups. These messages are combined with Single-channel authorization (ECM) for the channel received at that time to decode the message. 2. Multi-channel transmission system according to claim 1, in such a way that the message Multi-Signal Authorization (MECM) is encoded with a different algorithm than the encryption algorithm used. Single Channel Authorization Message (ECM) 3. Multi-channel transmission system according to claims 1 and 2, in such a way that The Multi-Signal Authorization (MECM) was modified for a time difference with the duration of the MECM. Single-channel authorization (ECM) 4. Multi-channel transmission system according to claims 1 to 3, in such a way that the information clause Multiple authorization messages (MECM) included with the information contained in the message. Single channel (ECM) is allowed with add, remove or exclude (XOR), multiply, or encode processes. 5. Multi-channel transmission system according to claims 1 to 3, which is in such a way that the unit The subscriber's subscriber consists of a controlled configuration (CW) cryptographic unit (CW) derived from a single channel authorization message (ECM), which allows the subscriber unit to decrypt the encrypted signal. Multiple-signal authorization (MECM) is combined with various parameters (P 1. P2 .... Pn) of the coding calculation of the unit coded with (CU). 6. Multi-channel encrypted transmission methods for paid televisions that include - Multi-channel encrypted signal transmission to the subscriber - Encrypted single-channel authorization (ECM) message transmission. Set for the channel Each Signal - Single Channel Authorization Message (ECM) for the channel. That the cryptographic unit (CU) accepted at that time. Decoded text that represents the control words (CW) needed to decode the signals. Suitable for the channel The signal received at that time The method is in such a way that it consists of a multi-signal authorization (MECM) group that is common to the group. Of these channels - decoding of these multi-signal authorization (MECM) messages and their merging Such decoded information and information necessary for obtaining control messages (CW). 7.Multi-channel encoded signaling method according to claim 6, which is That the aggregation takes place on the input parameters (P 1.P2 ... Pn) of the cryptographic unit (CU). 8. A multi-channel encoded signaling method according to claim 6, which is That the aggregation takes place on the results obtained by the crypto unit (CU). 9. A multi-channel encoded signaling method in accordance with claims 6 to 8, in such a way that the method consists of modifying the Multi-Signal Authorization Message (MECM) for different periods of time. Modification of the Single Channel Authorization Message (ECM) 1 0. A multi-channel encoded signaling method according to claims 6 through 9, in such a way that the method consists of encoding multiple authorization messages (MECM) based on different algorithms. The method used to decode the Single Channel Authorization Message (ECM).