Method of supplying power to time-stamping device, security device, and time-correcting device
First Claim
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1. A time-stamping device that affixes a digital signature including a local time clocked by an internal clock to electronic data, the time-stamping device comprising:
- an authentication-key storing unit that stores an authentication key;
an authentic-time receiving unit that receives an authentic time synchronized with a standard time from a time server by sending a request including the authentication key stored;
a time correcting unit that corrects the local time based on the authentic time received; and
a power-supply control unit that supplies a power to a plurality of units included in the time-stamping device, wherein the power-supply control unit keeps on supplying the power to the authentication key storing unit.
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Abstract
A power supply controller controls power supply to each unit included in a time-stamping device. The power supply controller determines which unit is to be supplied with power according to the length of the period when the time-stamping device is not used. However, the power supply controller continuously supplies power to an authentication key storing unit that stores an authentication key for receiving an authentic time from a time server to prevent falsification of the local time of the time-stamping device.
17 Citations
20 Claims
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1. A time-stamping device that affixes a digital signature including a local time clocked by an internal clock to electronic data, the time-stamping device comprising:
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an authentication-key storing unit that stores an authentication key;
an authentic-time receiving unit that receives an authentic time synchronized with a standard time from a time server by sending a request including the authentication key stored;
a time correcting unit that corrects the local time based on the authentic time received; and
a power-supply control unit that supplies a power to a plurality of units included in the time-stamping device, wherein the power-supply control unit keeps on supplying the power to the authentication key storing unit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for supplying a power to a time-stamping device that affixes a digital signature including a local time clocked by an internal clock to electronic data, the method comprising:
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storing an authentication key in a storage unit of the time-stamping device;
receiving an authentic time synchronized with a standard time from a time server by sending a request including the authentication key stored;
correcting the local time based on the authentic time received; and
supplying a power to a plurality of units included in the time-stamping device, wherein the power is continually supplied to the storage unit. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A computer-readable recording medium that stores a computer program for supplying a power to a time-stamping device that affixes a digital signature including a local time clocked by an internal clock to electronic data, wherein the computer program causes a computer to execute:
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storing an authentication key in a storage unit of the time-stamping device;
receiving an authentic time synchronized with a standard time from a time server by sending a request including the authentication key stored;
correcting the local time based on the authentic time received; and
supplying a power to a plurality of units included in the time-stamping device, wherein the power is continually supplied to the storage unit. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A security device that sends and receives data by means of an authentication key, the security device comprising:
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an authentication-key storing unit that stores the authentication key; and
a power-supply control unit that supplies a power to a plurality of units included in the security device, wherein the power-supply control unit keeps on supplying the power to the authentication key storing unit.
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20. A time-correcting device that corrects a local time by receiving an authentic time from a time server by means of an authentication key, the time-correcting device comprising:
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an authentication-key storing unit that stores the authentication key; and
a power-supply control unit that supplies a power to a plurality of units included in the time-correcting device, wherein the power-supply control unit keeps on supplying the power to the authentication key storing unit.
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Specification
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Current AssigneeCitizen Holdings Co., Ltd.
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Original AssigneeFUJITSU LIMITED & CITIZEN WATCH CO., LTD.
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InventorsAkiyama, Ryota, Kawashima, Takeaki
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Application NumberUS11/178,529Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current713/178CPC Class CodesH04L 2209/80 Wireless network architectu...H04L 9/3297 involving time stamps, e.g....
