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    • 11. 发明授权
    • Method and apparatus for encrypted transmission
    • 用于加密传输的方法和装置
    • US07191335B1
    • 2007-03-13
    • US09890587
    • 2000-02-04
    • Michel Maillard
    • Michel Maillard
    • H04L9/00
    • H04N7/163H04N7/1675H04N21/26606H04N21/4181H04N21/4367H04N21/4623
    • A method of encryption of data in a digital television system communicated between a first decoder and a portable security module, wherein a precalculated key pair is stored in a memory of the first decoder, wherein the key pair includes a session key and an encrypted version of the session key prepared using a transport key, the encrypted version of the session key being subsequently communicated to the portable security module which decrypts the encrypted version using an equivalent transport key stored in its memory such that data communicated from at least the portable security module to the first decoder may thereafter be encrypted and decrypted by the session key.
    • 一种在第一解码器和便携式安全模块之间通信的数字电视系统中的数据的加密方法,其中预先计算的密钥对存储在第一解码器的存储器中,其中密钥对包括会话密钥和加密版本 使用传输密钥准备的会话密钥,会话密钥的加密版本随后被传送到便携式安全模块,该便携式安全模块使用存储在其存储器中的等效传输密钥来解密加密版本,使得从至少该便携式安全模块传送的数据到 此后第一解码器可以被会话密钥加密和解密。
    • 13. 发明授权
    • Method and apparatus for recording of encrypted digital data
    • US06987854B2
    • 2006-01-17
    • US09928648
    • 2001-08-13
    • Michel Maillard
    • Michel Maillard
    • G06F1/24
    • H04N21/4408H04N5/913H04N7/163H04N7/1675H04N21/4334H04N21/4405H04N2005/91364
    • A method of transmitting and recording digital data scrambled using a control word. The scrambled data is transmitted together with the control word, and the method includes encrypting the control word with a first key. The encrypted control word is transmitted and received, and then decrypted with a decoder that includes an equivalent of the first key. The control word is re-encrypted with a second key stored in a portable support device that is received by the decoder, and the portable support device may be used with any suitable decoder. The re-encrypted control word and the scrambled digital data are recorded on a digital recording medium.An apparatus for transmitting and recording digital data scrambled using a control word. The scrambled data is transmitted together with the control word, and the apparatus includes a transmitter that encrypts the control word with a first key and transmits the encrypted control word. A decoder receives the encrypted control word and decrypts the control word. A portable support device including a second key is received by the decoder, and the decoder uses the second key to re-encrypt the decrypted control word and record the re-encrypted control word and the scrambled digital data on a digital recording medium. The portable support device may be used with any suitable decoder or digital recorder.