DATA ENCRYPTION DEVICE
First Claim
1. A portable data encryption device, comprising:
- a storage;
a wireless communication circuit which receives a wireless activation signal from an external terminal, and, in an operation using electromotive force generated by the received activation signal, receives an encryption key from the external terminal and stores the received encryption key into said storage;
a primary cell which supplies power;
a switch which switches a power supply from said primary cell from off to on; and
an encryption circuit which reads the encryption key from said storage, encrypts data using the read encryption key, and stores the encrypted data into said storage, said encryption circuit operating using the power supplied from said primary cell after the power supply from said primary cell is switched on.
1 Assignment
0 Petitions
Accused Products
Abstract
A portable data sensor tag (2), includes a memory (24), a data communication circuit (20) which receives a wireless activation signal from an external terminal, and, in an operation using electromotive force generated by the received activation signal, receives an encryption key from the external terminal and stores the received encryption key into the memory (24), a power source (23) which supplies power, an insulator (27) which switches a power supply from the power source (23) from off to on; and a sensor circuit (22) which reads the encryption key from the memory (24), encrypts measured data using the read encryption key, and stores the encrypted measurement data into the memory (24), the sensor circuit operating using the power supplied from the power source (23) after the power supply from the power source (23) is switched on.
29 Citations
21 Claims
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1. A portable data encryption device, comprising:
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a storage; a wireless communication circuit which receives a wireless activation signal from an external terminal, and, in an operation using electromotive force generated by the received activation signal, receives an encryption key from the external terminal and stores the received encryption key into said storage; a primary cell which supplies power; a switch which switches a power supply from said primary cell from off to on; and an encryption circuit which reads the encryption key from said storage, encrypts data using the read encryption key, and stores the encrypted data into said storage, said encryption circuit operating using the power supplied from said primary cell after the power supply from said primary cell is switched on. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A control method for a portable data encryption device including:
- a storage;
a wireless communication circuit which receives a wireless activation signal from an external terminal, and, in an operation using electromotive force generated by the received activation signal;
a primary cell which supplies power;
a switch which switches a power supply from the primary cell from off to on; and
an encryption circuit which operates using the power supplied from the primary cell, said control method comprising;receiving an encryption key from the external terminal by the wireless communication circuit and storing the received encryption key into the storage, when the power supply from the primary cell is off; and reading the encryption key from the storage after the power supplied from the primary cell is switched on from off by the switch, encrypting data, and storing the encrypted data into said storage.
- a storage;
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21. A portable integrated circuit, comprising:
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a storage; a wireless communication circuit which receives a wireless activation signal from an external terminal, and, in an operation using electromotive force generated by the received activation signal, receives an encryption key from the external terminal and stores the received encryption key into said storage; a primary cell which supplies power; a switch which switches a power supply from said primary cell from off to on; and an encryption circuit which reads the encryption key from said storage, encrypts data using the read encryption key, and stores the encrypted data into said storage, said encryption circuit operating using the power supplied from said primary cell after the power supply from said primary cell is switched on.
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Specification