Information terminal apparatus, information processing apparatus and information communication system
First Claim
1. An apparatus comprising:
- a secret key holding section for holding a secret key for the apparatus;
an identification information holding section for holding identification information of an apparatus or identification information of a user of said apparatus;
a digital signature means for providing a digital signature of a position/time information indicating position and time of reception of a signal received from a positioning satellite, by means of said secret key held in said secret key holding section;
a communication means for transmitting to a communication counterpart said identification information held in said identification information holding section and said position/time information having said digital signature attached thereto, said communication means also receiving position/time information having a digital signature attached thereto from another apparatus transmitting communication data input by another user to the apparatus; and
display means for displaying position information of the another apparatus when the apparatus is receiving the data input by the another user from the another apparatus.
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Accused Products
Abstract
When transmitting position/time information calculated by means of a GPS function to a server apparatus, authentication is carried out with the server apparatus. The position/time information may be certified as legitimate measured by a portable apparatus with a GPS reception function employed by a user. When transmitting information related to the position and the time acquired from a portable phone terminal having the GPS function and a network function by means of the GPS function to the server apparatus, authentication is carried out between the portable phone terminal and the server apparatus. The position/time information is transmitted to the server apparatus, only if the server apparatus is authenticated as a legitimate counterpart for connection. A secret key holding section is provided for holding different secret keys for different apparatuses. The position/time information measured based on an electromagnetic wave received from a positioning satellite is digitally signed by means of the secret key. The identification information and the position/time information having the digital signature are then transmitted to a counterpart.
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Citations
21 Claims
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1. An apparatus comprising:
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a secret key holding section for holding a secret key for the apparatus; an identification information holding section for holding identification information of an apparatus or identification information of a user of said apparatus; a digital signature means for providing a digital signature of a position/time information indicating position and time of reception of a signal received from a positioning satellite, by means of said secret key held in said secret key holding section; a communication means for transmitting to a communication counterpart said identification information held in said identification information holding section and said position/time information having said digital signature attached thereto, said communication means also receiving position/time information having a digital signature attached thereto from another apparatus transmitting communication data input by another user to the apparatus; and display means for displaying position information of the another apparatus when the apparatus is receiving the data input by the another user from the another apparatus. - View Dependent Claims (2, 3, 13, 21)
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4. An apparatus comprising:
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a secret key holding section for holding a secret key for the apparatus; an identification information holding section for holding identification information of an apparatus or identification information of a user of said apparatus; a digital signature means for providing a digital signature for a position/time information indicating position and time of reception of a signal received from a positioning satellite, by means of said secret key held in said secret key holding section; a storage means for storing in externally readable form said position/time information having said digital signature attached thereto; communication means for receiving position/time information having a digital signature attached thereto from another apparatus transmitting communication data input by another user to the apparatus; and display means for displaying the position information of the another apparatus when the apparatus is receiving the data input by the another user from the another apparatus. - View Dependent Claims (5, 6, 14)
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7. An apparatus comprising:
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an IC card mounting section for mounting an IC card; a means for providing said IC card with position/time information measured based on a signal received from a positioning satellite, the position/time information indicating position and time of reception of said signal; and a communication means for transmitting to a communication counterpart an IC card user identification information held in said IC card and said position/time information from said IC card, having a digital signature attached thereto, said communication means also receiving position/time information having a digital signature attached thereto from another apparatus transmitting communication data input by another user to the apparatus; and display means for displaying position information of the another apparatus when the apparatus is receiving the data input by the another user from the another apparatus. - View Dependent Claims (8, 9, 15)
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10. An apparatus comprising:
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an IC card mounting section for mounting an IC card; a means for providing said IC card with position/time information measured based on a signal received from a positioning satellite, the position/time information indicating position and time of reception of said signal; and a storage means for storing in externally readable form an IC card user identification information held in said IC card and said position/time information from said IC card, having a digital signature attached thereto; communication means for receiving position/time information having a digital signature attached thereto from another apparatus transmitting communication data input by another user to the apparatus; and display means for displaying the position information of the another apparatus when the apparatus is receiving the data input by the another user from the another apparatus. - View Dependent Claims (11, 12, 16)
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17. An apparatus comprising:
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a secret key holding unit configured to hold a secret key for the apparatus; an identification information holding unit configured to hold identification information of the apparatus or identification information of a user of said apparatus; a digital signature unit configured to provide a digital signature of a position/time information indicating position and time of reception of a signal received from a positioning satellite by using said secret key held in said secret key holding unit; a communication unit configured to transmit to a communication counterpart said identification information held in said identification information holding unit and said position/time information having said digital signature attached thereto, said communication unit configured to receive position/time information having a digital signature attached thereto from another apparatus transmitting communication data input by another user to the apparatus; and a display configured to display the position information of the another apparatus when the apparatus is receiving the data input by the another user from the another apparatus. - View Dependent Claims (20)
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18. A method comprising:
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storing a secret key for an apparatus; storing identification information of the apparatus or identification information of a user of the apparatus; providing, using a processor, a digital signature of a position/time information indicating position and time of reception of a signal received from a positioning satellite by using said secret key; transmitting to a communication counterpart said identification information and said position/time information having said digital signature attached thereto; receiving position/time information having a digital signature attached thereto from another apparatus transmitting communication data input by another user to the apparatus; and displaying the position information of the another apparatus when the apparatus is receiving the data input by the another user from the another apparatus.
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19. An information communication system comprising:
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a first information terminal apparatus including a secret key holding unit configured to hold a secret key for the first information terminal apparatus; an identification information holding unit configured to hold identification information of the first information terminal apparatus or identification information of a user of said first information terminal apparatus; a digital signature unit configured to provide a digital signature of a position/time information indicating position and time of reception of a signal received from a positioning satellite by using said secret key held in said secret key holding unit; a communication unit configured to transmit to a second information terminal apparatus said identification information held in said identification information holding unit and said position/time information having said digital signature attached thereto, said communication unit configured to receive position/time information having a digital signature attached thereto from the second information terminal apparatus transmitting communication data input by another user to the first information terminal apparatus; and a display configured to display the position information of the second information terminal apparatus when the first information terminal apparatus is receiving the data input by the another user from the second information terminal apparatus; and the second information terminal apparatus includes a communication unit configured to receive said identification information held and said position/time information having said digital signature attached thereto from the first information terminal apparatus, said communication unit configured to send the position/time information having the digital signature attached thereto to the first information terminal apparatus.
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Specification