Title: Transmitting/receiving system and method, transmitting apparatus and method, receiving apparatus and method, and program used therewith
Application Number: 200610109093 Application Date: 2006.08.02
Publication Number: 1909023 Publication Date: 2007.02.07
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G09C1/00
Applicant(s) Name: Sony Corp. Address:
Inventor(s) Name: Takeda Takayuki
Attorney & Agent: li deshan
Abstract:
    A transmitting/receiving system includes a transmitting apparatus that transmits, to another apparatus, first encrypted data obtained by encrypting stream data including consecutive unit data items in accordance with a first encryption technique prescribing that, when the stream data is encrypted for each item, keys used for encrypting the items are updated, and a receiving apparatus that receives and decrypts the first data from the transmitting apparatus in accordance with a first decryption technique. The transmitting apparatus includes an encryptor that outputs second encrypted data obtained by generating data including a predetermined number of keys, and encrypting the data in accordance with a second encryption technique, a transmitter that transmits the second data from the encryptor to the receiving apparatus. The receiving apparatus includes a key receiver that receives the second data from the transmitter, and a key decryptor that decrypts the second data in accordance with a second decryption technique.
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