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US 2003/0126455 A1Published application
Content data transmitting device and method, and recording/reproducing device
AssigneeSony Corporation
InventorsYoichiro Sako, Tatsuya Inokuchi, Shunsuke Furukawa
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Abstract
The present invention is relative to a data transmission method for transmitting data such as encrypted content data. A device which is to be a destination of transmission is authenticated and, if the device has not been authenticated, encrypted data read out from a storage unit is decrypted to give decoded data, which then is re-encrypted, based on innate key data acquired from the device which is to be the destination of transmission, to give re-encrypted data. The re-encrypted data is then transmitted to the device which is to be a destination of transmission.
Claims65
A data transmission device comprising:
- a storage unit for storage of encrypted data;
- an authentication unit for authenticating a device which is to be the destination of transmission;
- and
- a re-encryption unit for decoding the data read out from said storage unit and for re-encrypting the decoded data;
- wherein
- when said device which is to be the destination of transmission has been authenticated by said authentication unit, the data read out from said storage unit is decoded, and wherein the so decoded data is re-encrypted using innate key data acquired from said device which is to be the destination of transmission as authenticated by said authentication device;
- the so re-encrypted data being output to said device which is to be the destination of transmission.
4 more elements
A data transmitting method comprising:
- authenticating a device which is to be the destination of transmission;
- decoding encrypted data read out from a storage unit if said device which is to be the destination of transmission has been authenticated;
- re-encrypting the decoded data based on innate key data acquired from said device which is to be the destination of transmission;
- and sending the re-encrypted data to said device which is to be the destination of transmission.
1 more element
A data outputting method comprising:
- authenticating a device which is to be the outputting destination;
- checking whether or not said device which is to be the outputting destination has been authenticated;
- and
- selecting outputting of encrypted data read out from the storage unit based on said results of authentication.
1 more element
A recording method wherein
- data encrypted based on innate key data of a device which is to be the destination of transmission is input;
- data relevant to conditions of duplication are extracted from the decoded data when the input data has been decoded;
- and
- the operation of storing the decoded data in a recording unit is controlled based on said extracted data relevant to conditions of duplication.
1 more element
A recording device comprising:
- a decoding unit supplied with encrypted data based on innate key data of a device which is to be the destination of transmission;
- an extraction unit for extracting data relevant to the conditions of duplication from output data from said decoding unit;
- a recording unit in which decoded data is recorded;
- and
- a controller supplied with the decoded results from said decoder and with the data relevant to conditions of duplication, extracted by said extraction unit, said controller controlling the operation of storage in a recording unit of said decoded data, based on the data relevant to conditions of duplication as extracted by said extraction unit.
2 more elements
A method for generating encoded data comprising:
- encrypting content data of input digital data based on first key data;
- encrypting said first key data based on second key data generated using device-specific key data to generate encrypting key data;
- and
- generating encrypted data comprised at least of said encrypted content data and said key data.
1 more element
A method for decoding encrypted data comprising:
- generating second key data by device-specific key data and common key data read out from encrypted data comprised of a random number supplied to a device, said common key data, encrypted key data and encrypted content data;
- decoding said encrypted key data based on the second key data generated and said random number to generate first key data;
- and
- decoding said encrypted content data based on the first key data generated.
1 more element
A recording and/or reproducing device comprising:
- an encryption unit for encrypting supplied data;
- a storage unit in which the data encrypted by said encryption unit is stored;
- an authentication unit for authenticating a device which is to be the destination of transmission;
- a replay processing unit for replay processing data read out from said storage unit;
- and
- a re-encryption unit for decoding output data from said replay processing unit for re-encrypting the decoded data;
- wherein
- if said device which is to be the destination of transmission has been authenticated by said authentication unit, the data read out from said storage unit is decoded by said re-encryption unit;
- said decoded data being re-encrypted using innate key data acquired from said device which is to be the destination of transmission and which has been authenticated by said authentication unit;
- the re-encrypted data being output to said device which is to be the destination of transmission.
7 more elements
Dependencies are inferred from the claim text.