Communication device, communication system, communication method and communication program

• US 20100040030A1
• Filed: 10/09/2007
• Published: 02/18/2010
• Est. Priority Date: 10/06/2006
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Kakumaru, Takahiro
• Granted Patent: US 8,630,271 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04L 63/04 for providing a confidential data exchange among entities communicating through data packet networks
• CPC Class Codes: H04L 63/1475 Passive attacks, e.g. eavesdropping or listening without modification of the traffic monitored
• CPC Class Codes: H04W 12/02 Protecting privacy or anonymity, e.g. protecting personally identifiable information [PII]
• CPC Class Codes: H04W 12/033 of the user plane, e.g. user's traffic
• CPC Class Codes: H04W 12/121 Wireless intrusion detection systems [WIDS]; Wireless intrusion prevention systems [WIPS]
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

The object is to prevent a third party from specifying a condition of data communication executed by a radio terminal in a radio network using a radio communication device easily accessible to anyone such as WLAN. The radio base station 2 comprises a unit which determines whether to transmit a pseudo data frame assumed to be actual data communication according to a condition of data communication with the radio terminal 3 and a unit which stores information which is information for generating a pseudo data frame and based on actual data communication with the radio terminal 3, thereby generating and transmitting a pseudo data frame based on the stored information when starting pseudo data frame transmission.

Claims

1. A communication device, comprising:

a communication unit; and

a pseudo data transmission unit which transmits pseudo data that is a pseudo of true data in communication between said communication devices.

2. The communication device according to claim 1, further comprising:

a determination unit which determines whether to transmit said pseudo data or not, wherein said pseudo data transmission unit transmits said pseudo data based on a result of determination made by said determination unit.

3. The communication device according to claim 2, further comprising:

an obtaining unit which obtains said true data, wherein said determination unit determines whether to transmit said pseudo data or not according to a communication condition of said true data obtained by said obtaining unit.

4. The communication device according to claim 3, wherein said determination unit determines to start transmission of said pseudo data at a lapse of a timer value after detecting intermission of said true data obtained by said obtaining unit and determines to stop transmission of said pseudo data upon detecting occurrence of said true data.

5. The communication device according to claim 4, further comprising:

a timer value storage unit which stores said timer value as a predetermined range, wherein said determination unit makes a determination based on said timer value selected at random within said range.

6. The communication device according to claim 3, further comprising:

an address storage unit which stores, as address information of said pseudo data, address information of said communication device that executes communication by said true data, wherein said obtaining unit obtains only said true data with said communication device specified by said address information stored in said address storage unit.

7. The communication device according to claim 2, further comprising:

a communication application which executes a predetermined communication function, wherein said determination unit determines whether to transmit said pseudo data or not based on operation of said communication application.

8. The communication device according to claim 2, further comprising:

a user interface unit which accepts an instruction from a user, wherein said determination unit determines whether to transmit said pseudo data or not based on an instruction from said user interface unit.

9. The communication device according to claim 8, wherein said user interface unit is a button.

10. The communication device according to claim 1, further comprising:

a pseudo data generation information storage unit which stores pseudo data generation information for generating said pseudo data, wherein said pseudo data transmission unit generates said pseudo data based on said pseudo data generation information stored in said pseudo data generation information storage unit.

11. The communication device according to claim 10, wherein said pseudo data generation information storage unit stores a data frame of said pseudo data.

12. The communication device according to claim 11, wherein

said pseudo data generation information storage unit stores a plurality of data frames of said pseudo data, and

said pseudo data transmission unit transmits said data frames stored in said pseudo data generation information storage unit in a predetermined order and after transmitting all, repeats operation of again transmitting the data frames from the beginning in the predetermined order until a stop request is received.

13. The communication device according to claim 10, wherein

said pseudo data generation information storage unit stores data frame generation information for generating a data frame of said pseudo data, and

said pseudo data transmission unit generates said data frame based on said data frame generation information stored in said pseudo data generation information storage unit.

14. The communication device according to claim 10, wherein

said pseudo data generation information storage unit stores a plurality of pieces of data frame generation information for generating a data frame of said pseudo data, and

said pseudo data transmission unit generates said data frames based on said plurality of pieces of data frame generation information stored in said pseudo data generation information storage unit and transmits the data frames in a predetermined order and after transmitting all, repeats operation of again transmitting the data frames from the beginning in the predetermined order until a stop request is received.

15. The communication device according to claim 10, wherein

said pseudo data generation information storage unit stores application information related to an application for making a pseudo of said true data, and

said pseudo data transmission unit generates a series of said data frames based on said application information stored in said pseudo data generation information storage unit and transmits the data frames in a predetermined order until a stop request is received.

16. The communication device according to claim 15, wherein

said pseudo data generation information storage unit stores a data communication continuous time corresponding to each said application which is a time for continuously transmitting said pseudo data, and

said pseudo data transmission unit, after generating a series of data frames based on said application information stored in said pseudo data generation information storage unit, transmits said series of data frames in a predetermined order based on said data communication continuous time corresponding to said application which is obtained from said pseudo data generation information storage unit.

17. The communication device according to claim 15, wherein

said pseudo data transmission unit, after selecting at random, related to said application information stored in said pseudo data generation information storage unit, one from application types indicating which of said applications is assumed to transmit said pseudo data and transmitting said pseudo data corresponding to selected said application type based on said data communication continuous time, stops transmission of said pseudo data for a random time period, again selects at random one from said application types stored in said pseudo data generation information storage unit and thereafter repeats the foregoing operation until a request for stopping transmission of said pseudo data is received.

18. The communication device according to claim 10, wherein

said pseudo data generation information storage unit stores a data frame transmission time interval in communication of said true data, and

said pseudo data transmission unit transmits said pseudo data based on said data frame transmission time interval.

19. The communication device according to claim 12, wherein

said pseudo data generation information storage unit obtains address information of said true data from the address storage unit which stores address information of said true data, and

said pseudo data transmission unit uses address information of said true data at the time of generating said data frame.

20. The communication device according to claim 6, wherein said address information comprises a MAC address of said communication device.

21. The communication device according to claim 1, wherein

said pseudo data transmission unit enciphers said pseudo data and transmits the obtained data.

22. The communication device according to claim 1, wherein said communication unit changes a radio wave output at the time of transmission of said pseudo data based on a destination of said pseudo data and an address of a transmission source.

23. The communication device according to claim 1, which comprises a radio terminal that executes radio communication by said communication unit.

24. The communication device according to claim 23, which comprises a radio base station connected to a communication network to execute radio communication with said radio terminal.

25. The communication device according to claim 24, wherein based on an assignment state of said radio terminal managed by the radio base station, said radio base station refrains from transmitting pseudo data when the terminal is assigned and transmits pseudo data when not assigned.

26. The communication device according to claim 23, further comprising the function of constantly monitoring a condition of data communication through radio.

27. A communication system including a communication device according to claim 1.

28. A communication method in a communication device having a communication unit, including:

transmitting pseudo data that comprises a pseudo of true data in communication between said communication devices.

29. The communication method according to claim 28, further including

determining whether to transmit said pseudo data or not,

wherein in said pseudo data transmitting, transmitting said pseudo data based on a result of determination made by said determining.

30. The communication method according to claim 29, further including

obtaining said true data,

wherein in said determining, determining whether to transmit said pseudo data or not according to a communication condition of said true data obtained by said obtaining.

31. The communication method according to claim 30, wherein in said determining, determining to start transmission of said pseudo data at a lapse of a timer value after detecting intermission of said true data obtained by said obtaining and determining to stop transmission of said pseudo data upon detecting occurrence of said true data.

32. The communication method according to claim 31, wherein in said determining, making determination based on a timer value selected at random within a range of a timer value storage unit that stores said timer value as a predetermined range.

33. The communication method according to claim 30, further including

storing address information of said communication device that executes communication by said true data in an address storage unit, as address information of said pseudo data,

wherein in said obtaining, obtaining only said true data with said communication device specified by said address information stored in said address storage unit.

34. The communication method according to claim 29, wherein in said determining, determining whether to transmit said pseudo data or not based on operation of a communication application for executing a predetermined communication function.

35. The communication method according to claim 29, wherein in said determining, determining whether to transmit said pseudo data or not based on an instruction from a user interface unit which accepts an instruction from a user.

36. The communication method according to claim 28, further including

storing pseudo data generation information for generating said pseudo data in a pseudo data generation information storage unit,

wherein in said transmitting, generating said pseudo data based on said pseudo data generation information stored in said pseudo data generation information storage unit.

37. The communication method according to claim 36, wherein in said pseudo data generation information storing, storing a data frame of said pseudo data.

38. The communication method according to claim 37, wherein in said pseudo data generation information storing, storing a plurality of data frames of said pseudo data, and

in said transmitting, transmitting said data frames stored in said pseudo data generation information storage unit in a predetermined order and after transmitting all, repeating operation of again transmitting the data frames from the beginning in the predetermined order until a stop request is received.

39. The communication method according to claim 36, wherein in said pseudo data generation information storing, storing data frame generation information for generating a data frame of said pseudo data, and

in said transmitting, generating said data frame based on said data frame generation information stored in said pseudo data generation information storage unit.

40. The communication method according to claim 36, wherein in said pseudo data generation information storing, storing a plurality of pieces of data frame generation information for generating a data frame of said pseudo data, and

in said transmitting, generating said data frames based on said plurality of pieces of data frame generation information stored in said pseudo data generation information storage unit and transmitting the data frames in a predetermined order and after transmitting all, repeating operation of again transmitting the data frames from the beginning in the predetermined order until a stop request is received.

41. The communication method according to claim 37, wherein in said transmitting, generating a series of said data frames based on application information related to an application for making a pseudo of said true data and transmitting the data frames in a predetermined order until a stop request is received.

42. The communication method according to claim 41, wherein in said transmitting, after generating a series of data frames based on said application information, transmitting said series of data frames in a predetermined order based on said data communication continuous time corresponding to each said application which is time for continuously transmitting said pseudo data.

43. The communication method according to claim 41, wherein in said transmitting, after selecting at random, related to said application information, one from application types indicating which of said applications is assumed to transmit said pseudo data and transmitting said pseudo data corresponding to selected said application type based on said data communication continuous time, stopping transmission of said pseudo data for a random time period, again selecting at random one from said application types stored in said pseudo data generation information storage unit and thereafter repeating the foregoing operation until a request for stopping transmission of said pseudo data is received.

44. The communication method according to claim 36, wherein in said transmitting, transmitting said pseudo data based on a data frame transmission time interval in communication of said true data.

45. The communication method according to claim 38, wherein in said pseudo data generation information storing, obtaining address information of said true data from the address storage unit which stores address information of said true data, and

in said transmitting, using address information of said true data at the time of generating said data frame.

46. The communication method according to claim 28, further including

changing a radio wave output at the time of transmission of said pseudo data based on a destination of said pseudo data and an address of a transmission source.

47. The communication method according to claim 46, wherein in said transmitting, based on an assignment state of a radio terminal managed trough a communication network, refraining from transmitting pseudo data when the terminal is assigned and transmitting pseudo data when not assigned.

48. A computer readable medium storing a communication program executed on a communication device having a communication unit, comprising:

a function of transmitting pseudo data that is a pseudo of true data in communication between said communication devices.

49. The computer readable medium according to claim 48, further comprising

a function of determining whether to transmit said pseudo data or not, and

wherein in said transmitting function, transmitting said pseudo data based on a result of determination made by said determining.

50. The computer readable medium according to claim 49, further comprising

a function of obtaining said true data,

wherein in said determination function, determining whether to transmit said pseudo data or not according to a communication condition of said true data obtained by said obtaining unit.

51. The computer readable medium according to claim 50, wherein in said determining function, determining to start transmission of said pseudo data at a lapse of a timer value after detecting intermission of said true data obtained by said obtaining unit, and determining to stop transmission of said pseudo data upon detecting occurrence of said true data.

52. The computer readable medium according to claim 51, wherein in said determining function,

making determination based on a timer value selected at random within a range of a timer value storage unit that stores said timer value as a predetermined range.

53. The computer readable medium according to claim 50, further comprising

a function of storing address information of said communication device that executes communication by said true data in an address storage unit, as address information of said pseudo data,

wherein in said obtaining function, obtaining only said true data with said communication device specified by said address information stored in said address storage unit.

54. The computer readable medium according to claim 49, wherein in said determining function,

determining whether to transmit said pseudo data or not based on operation of a communication application for executing a predetermined communication function.

55. The computer readable medium according to claim 49, wherein in said determining function,

determining whether to transmit said pseudo data or not based on an instruction from a user interface unit which accepts an instruction from a user.

56. The computer readable medium according to claim 48, further comprising

a function of storing pseudo data generation information for generating said pseudo data in a pseudo data generation information storage unit,

wherein in said transmitting function, generating said pseudo data based on said pseudo data generation information stored in said pseudo data generation information storage unit.

57. The computer readable medium according to claim 56, wherein in said pseudo data generation information storing function, storing a data frame of said pseudo data.

58. The computer readable medium according to claim 57, wherein in said pseudo data generation information storing function, storing a plurality of data frames of said pseudo data, and

in said transmitting function, transmitting said data frames stored in said pseudo data generation information storage unit in a predetermined order and after transmitting all, repeating operation of again transmitting the data frames from the beginning in the predetermined order until a stop request is received.

59. The computer readable medium according to claim 56, wherein in said pseudo data generation information storing function, storing data frame generation information for generating a data frame of said pseudo data, and

in said transmitting function, generating said data frame based on said data frame generation information stored in said pseudo data generation information storage unit.

60. The computer readable medium according to claim 56, wherein in said pseudo data generation information storing function, storing a plurality of pieces of data frame generation information for generating a data frame of said pseudo data, and

in said transmitting function, generating said data frames based on said plurality of pieces of data frame generation information stored in said pseudo data generation information storage unit and transmitting the data frames in a predetermined order and after transmitting all, repeating operation of again transmitting the data frames from the beginning in the predetermined order until a stop request is received.

61. The computer readable medium according to claim 57, wherein in said transmitting function, generating a series of said data frames based on application information related to an application for making a pseudo of said true data and transmitting the data frames in a predetermined order until a stop request is received.

62. The computer readable medium according to claim 61, wherein in said transmitting function, after generating a series of data frames based on said application information, transmitting said series of data frames in a predetermined order based on said data communication continuous time corresponding to each said application which is time for continuously transmitting said pseudo data.

63. The computer readable medium according to claim 61, wherein in said transmitting function, after selecting at random, related to said application information, one from application types indicating which of said applications is assumed to transmit said pseudo data and transmitting said pseudo data corresponding to selected said application type based on said data communication continuous time, stopping transmission of said pseudo data for a random time period, again selecting at random one from said application types stored in said pseudo data generation information storage unit and thereafter repeating the foregoing operation until a request for stopping transmission of said pseudo data is received.

64. The computer readable medium according to claim 56, wherein in said transmitting function, transmitting said pseudo data based on a data frame transmission time interval in communication of said true data.

65. The computer readable medium according to claim 58, wherein in said pseudo data generation information storing function, obtaining address information of said true data from the address storage unit which stores address information of said true data, and

in said transmitting function, using address information of said true data at the time of generating said data frame.

66. The computer readable medium according to claim 48, comprising

a function of changing a radio wave output at the time of transmission of said pseudo data based on a destination of said pseudo data and an address of a transmission source.

67. The computer readable medium according to claim 66, wherein in said transmitting function, based on an assignment state of a radio terminal managed through a communication network, refraining from transmitting pseudo data when the terminal is assigned and transmitting pseudo data when not assigned.