Data transmitting apparatus, data transmitting method, data receiving apparatus, data receiving method, data transmission apparatus, and data transmission method

• US 6,373,952 B2
• Filed: 05/29/1998
• Issued: 04/16/2002
• Est. Priority Date: 03/15/1996
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Asano, Tomoyuki, Ishii, Makoto, Kubota, Ichiro
• Primary Examiner(s): Peeso, Thomas R.
• Application Number:
  US08/952,298
• Publication Number:
  US 20010002212A1
• Time in Patent Office: 1,418 Days
• Field of Search: 380/278, 380/33, 380/283
• US Class Current: 380/278
• CPC Class Codes: H04L 2209/34 Encoding or coding, e.g. Huffman coding or error correction
• CPC Class Codes: H04L 2209/80 Wireless network architectures or network communication protocols for wireless network security H04W12/00
• CPC Class Codes: H04L 9/0833 involving conference or group key network architectures or network communication protocols for key management in group communication in a packet data network H04L63/065

Abstract

The present invention provides a data transmission apparatus which enhances the safety with respect to leakage of encoded transmitted data by raising the safety of transmission of an encoding key or a decoding key. It provides a large capacity transmission line 152 such as a satellite transmission line for transmitting a large amount of data and a small capacity transmission line 156 such as a public telephone line for transmitting an encoding key or decoding key or information for the generation of them. The encoding session key 107 is generated by using a work key and a destination address of a receiving apparatus of the destination. Further, the decoding session key 108 is generated using one'"'"'s own address and the work key. The work key is preferably encoded and transmitted through the small capacity transmission line 156. In the transmitting apparatus 101, in addition to the encoding of the data 105 which should be transmitted by using the encoding session converted as described above, transmission control information such as destination data is added and is transmitted to the receiving apparatus 102 through the large capacity transmission line 152. In the receiving apparatus 102, the encoded data 110 is decoded by using the decoding session key 108 converted as described above.

Claims

1. A data transmission apparatus connected to a first transmission system and a second transmission system and connected to at least one data reception apparatus for decoding a received encoded data by using a decoding key, the data transmission apparatus comprising:

a key transmitting means for transmitting decoding key information for decoding encoded data and destination information associated with the encoded data to be transmitted to the first transmission system, to said data reception apparatus through the second transmission system,

a generating means for adding first transmission control information including transmission information indicating a destination information of a data receiving apparatus to which a transmission data is transmitted, to the data to be encoded and transmitted so as to generate transmitted data,

an encoding means for encoding at least the transmission data based on encoding key information corresponding to the decoding key information to generate encoded data, and

a data transmitting means for transmitting to the first transmission system the encoded data generated by the encoding means.

2. A data transmission apparatus as set forth in claim 1, wherein the communication capacity per unit time of the first transmission system is larger than the communication capacity per unit time of the second transmission system.

3. A data transmission apparatus as set forth in claim 2, wherein the first transmission system includes a satellite transmission line.

4. A data transmission apparatus as set forth in claim 3, wherein the second transmission system includes a cable transmission line.

5. A data transmission apparatus as set forth in claim 1, wherein the key transmitting means transmits the same decoding key information and destination information to a plurality of receiving apparatuses connected to a first transmission system and a second transmission system.

6. A data transmission apparatus as set forth in claim 1, wherein the encoding means generates encoded data from the data based on the encoding key information and the destination information of the transmitted data.

7. A data transmission apparatus as set forth in claim 1, further comprising key encoding means for encoding a work key information to generate decoding key information.

8. A data transmission apparatus as set forth in claim 7, wherein the encoding means generates encoded data from the data based on the work key information and the destination information of the transmitted data.

9. A data transmission apparatus as set forth in claim 1, wherein the first transmission control information includes an address defined by an Internet protocol as the destination information.

10. A data transmission apparatus as set forth in claim 1, wherein the encoding means encodes the transmitted data including the first transmission control information.

11. A data transmission apparatus as set forth in claim 1, wherein the encoding means adds to the transmitted data second transmission control information including the same destination information as the destination information included in the first transmission control information to generate the encoded data.

12. A data transmission apparatus as set forth in claim 11, wherein the encoding means adds to the encoded data a CRC check bit.

13. A data transmission apparatus as set forth in claim 11, wherein the second transmission control information includes information indicating the presence of coding of the data to be transmitted.

14. A data transmission apparatus as set forth in claim 13, wherein the second transmission control information includes information for distinguishing whether the data to be transmitted is information responding to a request from a receiving apparatus or whether it is control information for operating the communications system including the data transmitting apparatus.

15. A data transmitting apparatus connected to a first transmission system and a second transmission system and connected to at least one data reception apparatus for decoding a received encoded data by using a decoding key, the data transmitting apparatus comprising:

a key receiving means for receiving encoding key information for encoding encoded data and destination information associated with the encoded data to be transmitted to the first transmission system, from the data reception apparatus through the second transmission system,

a data generating means for adding control information including transmission information indicating a destination information of a data receiving apparatus to which a transmission data is transmitted to the data to be encoded and transmitted to generate transmitted data,

an encoding means for generating encoded data from the transmission data based on the encoding key information, and

a data transmitting means for transmitting through the first transmission system the encoded data generated by the encoding means.

16. A data transmitting apparatus as set forth in claim 15, wherein the encoding means comprises key decoding means for decoding the encoding key information to generate work key information, and uses the work key information decoded by the key decoding means to generate encoded data.

17. A data transmitting apparatus as set forth in claim 16, wherein the encoding means generates encoded data based on the work key information and the destination information of the encoded data.

18. A data transmission method for transmitting data using a first transmission system and a second transmission system and connected to at least one data reception apparatus for decoding a received encoded data by using a decoding key, the data transmission method comprising:

a key transmitting step for transmitting other decoding key information for decoding encoded data along with destination information associated with the encoded data to be transmitted to the first transmission system, to the second transmission system,

a data generating step for adding first transmission control information including transmission information indicating a destination information of a data receiving apparatus to which a transmission data is transmitted, to the data to be encoded and transmitted to generate transmission data,

an encoding step for encoding the generated transmission data based on encoding key information corresponding to the decoding key information to generate encoded data, and

a data transmitting step for transmitting the encoded data generated in the encoding step to the first transmission system.

19. A data transmission method as set forth in claim 18, wherein the communication capacity per unit time of the first transmission system is larger than the communication capacity per unit time of the second transmission system.

20. A data transmission method as set forth in claim 19, wherein the first transmission system includes a satellite transmission line.

21. A data transmission method as set forth in claim 19, wherein the second transmission system includes a cable transmission line.

22. A data transmission method as set forth in claim 18, wherein the key transmitting step transmits the same decoding key information and destination information to a plurality of receiving apparatuses connected to a first transmission system and a second transmission system.

23. A data transmission method as set forth in claim 18, wherein the encoding step generates encoded data from the data based on the encoding key information and the destination information of the transmitted data.

24. A data transmission method as set forth in claim 18, wherein further comprising a key encoding step for encoding a work key information to generate decoding key information.

25. A data transmission method as set forth in claim 24, wherein the encoding step generates encoded data from the data based on the work key information and the destination information of the transmitted data.

26. A data transmission method as set forth in claim 18, wherein the first transmission control information includes an address defined by an Internet protocol as the destination information.

27. A data transmission method as set forth in claim 26, wherein the encoding step encodes the transmitted data including the first transmission control information.

28. A data transmission method as set forth in claim 26, wherein the encoding step adds to the transmitted data second transmission control information including the same destination information as the destination information included in the first transmission control information to generate the encoded data.

29. A data transmission method as set forth in claim 28, wherein the encoding step adds to the encoded data a CRC check bit.

30. A data transmission method as set forth in claim 28, wherein the second transmission control information includes information indicating the presence of coding of the data to be transmitted.

31. A data transmission method as set forth in claim 30, wherein the second transmission control information includes information for distinguishing whether the data to be transmitted is information responding to a request from a receiving apparatus or whether it is control information for operating the communications system including the data transmitting apparatus.

32. A data transmission method in a transmitting apparatus connected to a first transmission system and a second transmission system and connected to at least one data reception apparatus for decoding a received encoded data by using a decoding key, the data transmission method comprising:

a key receiving step for receiving encoding key information for encoding encoded data along with destination information associated with the encoded data to be transmitted to the first transmission system, from the data reception apparatus through the second transmission system,

a data generating step for adding control information including transmssion information indicating a destination information of a data receiving apparatus to which transmission data is transmitted, to the data to be encoded and transmitted to generate the transmission data,

an encoding step for generating encoded data from the transmission data based on the encoding key information, and

a data transmitting step for transmitting the encoded data generated in the encoding step to the first transmission system.

33. A data transmission method as set forth in claim 32, wherein the encoding step includes a key decoding step for decoding the encoding key information to generate work key information, and uses the work key information decoded by the key decoding step to generate encoded data.

34. A data transmission method as set forth in claim 33, wherein the encoding step generates encoded data based on the work key information and the destination information of the encoded data.

35. A data receiving apparatus connected to a first transmission system through which encoded data is transmitted and a second transmission system through which key information is transmitted, the data receiving apparatus comprising:

a key receiving means for receiving decoding key information for decoding encoded data and destination information of the encoded data received from the first transmission system, from the second transmission system,

a data receiving means for receiving the decoded data from the first transmission system,

a data restoring means for deleting first transmission control information including transmission information indicating a destination information of a data receiving apparatus to which a transmission data is transmitted from the encoded data, and

a decoding means for decoding the encoded data from which the first transmission control information was deleted, based on the decoding key information to generate decoded data.

36. A data receiving apparatus as set forth in claim 35, wherein the communication capacity per unit time of the first transmission system is larger than the communication capacity per unit time of the second transmission system.

37. A data receiving apparatus as set forth in claim 36, wherein the first transmission system includes a satellite transmission line.

38. A data receiving apparatus as set forth in claim 36, wherein the second transmission system includes a cable transmission line.

39. A data receiving apparatus as set forth in claim 35, wherein a plurality of receiving apparatuses are connected to the first transmission system and the second transmission system, and the key receiving means receives the same decoding key information and destination information as other receiving apparatuses connected to a first transmission system and a second transmission system.

40. A data receiving apparatus as set forth in claim 35, wherein the decoding means generates decoded data from the received data based on the decoding key information and the destination information of the encoded data.

41. A data receiving apparatus as set forth in claim 35, wherein the decoding means includes key decoding means for decoding the decoding key information to generate work key information, and uses the work key information generated by the key decoding means to decode the encoded data.

42. A data receiving apparatus as set forth in claim 41, wherein the decoding means decodes the encoded data based on the work key information and the destination information of the encoded data.

43. A data receiving apparatus as set forth in claim 35, wherein the first transmission control information includes an address defined by an Internet protocol as the destination information.

44. A data receiving apparatus as set forth in claim 35, wherein the decoding means decodes the encoded data which was encoded including the first transmission control information.

45. A data receiving apparatus as set forth in claim 35, wherein it further comprises a judgment means for judging if the encoded data is directed to itself based on the second transmission control information including the same destination information as the destination information included in the first transmission control information of the encoded data.

46. A data receiving apparatus as set forth in claim 45, wherein the judgement means judges whether the encoded data is directed to itself and checks the CRC check bit added to the encoded data check for errors.

47. A data receiving apparatus as set forth in claim 45, wherein the judgement means judges whether the encoded data is directed to itself and decides whether to decode or not based on the information indicating the presence of encoding included in the second transmission control information.

48. A data receiving apparatus as set forth in claim 47, wherein the second transmission control information includes information for distinguishing whether the received data is information responding to a request from its own receiving apparatus or whether it is control information for operating the communications system including the receiving apparatus.

49. A data receiving apparatus connected to a first transmission system through which encoded data is transmitted and a second transmission system through which key information is transmitted, the data receiving apparatus comprising:

a key transmitting means for transmitting encoding key information for producing encoded data along with destination information associated with the encoded data received from the first transmission system, to the second transmission system,

a data receiving means for receiving the encoded data encoded based on the encoding key information from the first transmission system,

a data restoring means for deleting the first transmission control information including transmission information indicating destination information of a data receiving apparatus to which a transmission data is transmitted, from the encoded data, and

a decoding means for decoding the encoded data based on decoding key information corresponding to the encoding key information.

50. A data receiving apparatus as set forth in claim 49, further comprising a key encoding means for encoding work key information to generate encoding key information.

51. A data receiving apparatus as set forth in claim 50, wherein the decoding means comprises a decoding key generating means for generating a decoding key based on the work key information and the destination information of the encoded data, and decodes the encoded data based on the decoding key generated by the decoding key generating means.

52. A data receiving method in a receiving apparatus connected to a first transmission system through which encoded data is transmitted and a second transmission system through which key information is transmitted, and decoding a received encoded data using a decoding key, the data receiving method comprising:

a key receiving step for receiving decoding key information for decoding encoded data along with destination information associated with the encoded data received from the first transmission system, from the second transmission system,

a data receiving step for receiving the decoded data from the first transmission system,

a data restoring step for deleting first transmission control information including transmission information including transmission information indicating a destination information of a data receiving apparatus to which a transmission data is transmitted, from the encoded data, and

a decoding step for decoding the encoded data from which the first transmission control information was deleted based on the decoding key information to generate decoded data.

53. A data receiving method as set forth in claim 52, wherein the communication capacity per unit time of the first transmission system is larger than the communication capacity per unit time of the second transmission system.

54. A data receiving method as set forth in claim 53, wherein the first transmission system includes a satellite transmission line.

55. A data receiving method as set forth in claim 53, wherein the second transmission system includes a cable transmission line.

56. A data receiving method as set forth in claim 52, wherein the key receiving step receives the same decoding key information and destination information as other receiving apparatuses connected to the first transmission system and the second transmission system.

57. A data receiving method as set forth in claim 52, wherein the decoding step generates decoded data from the encoded data based on the decoding key information and the destination information of the encoded data.

58. A data receiving method as set forth in claim 52, wherein the decoding step includes key decoding step for decoding the decoding key information to generate work key information, and uses the work key information generated by the key decoding step to decode the encoded data.

59. A data receiving method as set forth in claim 58, wherein the decoding step decodes the encoded data based on the work key information and the destination information of the encoded data.

60. A data receiving method as set forth in claim 52, wherein the first transmission control information includes an address defined by an Internet protocol as the destination information.

61. A data receiving method as set forth in claim 52, wherein the decoding step decodes the encoded data which was encoded including the first transmission control information.

62. A data receiving method as set forth in claim 52, wherein further comprising a judgement step for judging whether the encoded data is directed to itself based on a second transmission control information including the same destination information as the destination information included in the first transmission control information of the encoded data.

63. A data receiving method as set forth in claim 62, wherein the judgement step judges whether the encoded data is directed to itself and checks to the CRC check bit added to the encoded data to check for errors.

64. A data receiving method as set forth in claim 62, wherein the judgement step judges whether the encoded data is directed to itself and decides whether to decode or not based on the information indicating the presence of encoding included in the second transmission control information.

65. A data receiving method as set forth in claim 64, wherein the second transmission control information includes information for distinguishing whether the received data is information responding to a request from its own receiving apparatus or whether it is control information for operating the communications system including the receiving apparatus.

66. A data receiving method in a receiving apparatus connected to a first transmission system through which encoded data is transmitted and a second transmission system through which key information is transmitted, and decoding a received encoded data using a decoding key, the data receiving method comprising:

a key transmitting step for transmitting encoding key information for producing encoding data along with destination information associated with the encoding data received from the first transmission system, to the second transmission system,

a data receiving step for receiving the encoded data encoded based on the encoding key information from the first transmission system,

a data restoring step for deleting the first transmission control information including transmission information indicating a destination information of a data receiving apparatus to which a transmission data is transmitted, from the encoded data, and

a decoding step for decoding the encoded data from which the first transmission control information was deleted, based on decoding key information corresponding to the encoding key information.

67. A data receiving method as set forth in claim 66, wherein it further comprises a key encoding step for encoding work key information to general encoding key information.

68. A data receiving method as set forth in claim 67, wherein the decoding step includes a decoding key generating step for generating decoding key information based on the work key information and the destination information of the encoded data, and decodes the encoded data based on the decoding key generated by the decoding key generating step.

69. A data transmission system comprising a data transmitting apparatus encoding a transmission data and transmitting the same and a data receiving apparatus receiving the encoded data by using a decoding key and decoding a received encoded data, the data transmitting apparatus and the data receiving apparatus being connected to a first transmission system through which encoded data is transmitted and a second transmission system through which key information is transmitted, the data transmission system comprising:

a data transmitting apparatus having

a key transmitting means for transmitting decoding key information for decoding the encoded data along with destination information associated with the encoded data to be transmitted to the first transmission system to the second transmission system,

a data generating means for generating transmitted data added with first transmission control information including transmission information indicating a destination information of a data receiving apparatus to which a transmission data is transmitted, from the data to be encoded and transmitted,

an encoding means for generating encoded data from the transmitted data based on encoding key information corresponding to the decoding key information, and

a data transmitting means for transmitting through the first transmission system the encoded data generated by the encoding means and

the data receiving apparatus having

a key receiving means for receiving from the second transmission system decoding key information for decoding the encoded data along with destination information associated with the encoded data received from the first transmission system,

a data receiving means for receiving the encoded data from the first transmission system, data restoring means for deleting first transmission control information from the encoded data, and

a decoding means for decoding the encoded data from which the first transmission control information was deleted, based on the decoding key information.

70. A data transmission system comprising a data transmitting apparatus encoding a transmission data and transmitting the same and a data receiving apparatus receiving the encoded data by using a decoding key and decoding a received encoded data, the data transmitting apparatus and the data receiving apparatus being connected to a first transmission system through which encoded data is transmitted and a second transmission system through which key information is transmitted, the data transmission system comprising:

the data transmitting apparatus having

a key receiving means for receiving encoding key information for encoding the encoded data along with destination information associated with the encoded data to be transmitted to the first transmission system, from the second transmission system,

a data generating means for generating transmitted data added with control information from the data to be encoded and transmitted,

an encoding means for generating encoded data from the transmitted data based on encoding key information, and

a data transmitting means for transmitting through the first transmission system the encoded data generated by the encoding means and

a data receiving apparatus having

a key transmitting means for transmitting through the second transmission system encoding key information for preparing the encoded data along with destination information associated with the encoded data received from the first transmission system,

a data receiving means for receiving the encoded data encoded based on the encoding key information from the first transmission system,

a data restoring means for deleting first transmission control information from the encoded data, and

a decoding means for decoding the encoded data from which the first transmission control information was deleted, based on decoding key information corresponding to the encoding key information.

71. A data transmission method using a transmission system having a first transmission system and a second transmission system, the data transmission method comprising:

transmitting processing step having

key transmitting step for transmitting through the second transmission system decoding key information for decoding the encoded data along with destination data associated with the encoded data transmitted through the first transmission system,

generating step for adding first transmission control information to the data encoded or to be encoded,

encoding step for generating encoded data from the data based on encoding key information corresponding to the decoding key information, and

data transmitting step for transmitting through the first transmission system the encoded data, and

receiving processing step having

key receiving step for receiving from the second transmission system decoding key information for decoding the encoded data along with destination information associated with the encoded data received from the first transmission system,

data receiving step for receiving the encoded data from the first transmission system,

restoring step for removing the first transmission control information from the data decoded or to be decoded, and

decoding step for decoding the encoded data based on the decoding key information.

72. A data transmission method for transmission of data using a transmission system having a first transmission system and a second transmission system, the data transmission system method comprising:

a transmitting processing step having

key receiving step for receiving from the second transmission system encoding key information for encoding the encoded data along with destination data associated with the encoded data transmitted through the first transmission system,

generating step for adding first control information to the data encoded or to be encoded,

encoding step for generating encoded data from the data based on encoding key information, and

data transmitting step for transmitting through the first transmission system the encoded data, and

receiving processing step having

key transmitting step for transmitting through the second transmission system encoding key information for preparing the encoded data along with destination information associated with the encoded data received from the first transmission system,

data receiving step for receiving the encoded data encoded based on the encoding key information from the first transmission system,

decoding step for decoding the encoded data based on decoding key information corresponding to the encoding key information.