Memory device and electronic device using the same
First Claim
1. A memory device comprising:
- first memory of non-tamper-resistance having a usual area that can be accessed from the electronic device and a secure area that cannot directly be accessed from the electronic device;
second memory of tamper resistance that cannot directly be accessed from the electronic device; and
a secure control section for controlling access to the second memory, wherein access to the secure area of the first memory from the electronic device can be made only through the secure control section.
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Abstract
It is an object of the invention to provide a memory device including a memory area having a large storage capacity and an equal security level to that of a Smart card.
A semiconductor memory card 10 that can be attached to and detached from an electronic device is provided with first memory 50 of non-tamper-resistance having usual areas 52 and 53 that can be accessed from the electronic device and a secure area 51 that cannot directly be accessed from the electronic device, and second memory 41 of tamper resistance that cannot directly be accessed from the electronic device, wherein access to the secure area 51 of the first memory 50 can be made only through a secure control section 30 for managing access to the second memory 41. The secure area 51 cannot directly be accessed by an external device and therefore has the higher security level than the authentication area 52. Since the secure area 51 is placed in the non-tamper-resistant memory 50, a large storage capacity can be reserved.
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Citations
16 Claims
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1. A memory device comprising:
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first memory of non-tamper-resistance having a usual area that can be accessed from the electronic device and a secure area that cannot directly be accessed from the electronic device;
second memory of tamper resistance that cannot directly be accessed from the electronic device; and
a secure control section for controlling access to the second memory, wherein access to the secure area of the first memory from the electronic device can be made only through the secure control section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 16)
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12. An electronic device for accessing a memory device having a first area, a second area, and a third area as memory areas,
wherein upon reception of an access request to the memory device, the electronic device: -
accesses the first area of a non-tamper-resistant memory area of the memory device through a general control section of the memory device for controlling access to the memory device;
after authenticated by the general control section and a secure control section of the memory device for controlling access to the second area and the third area, accesses the second area of a non-tamper-resistant memory area through the secure control section; and
after authentication with the secure control section, accesses the third area of a tamper-resistant memory area of the memory device through the general control section and the secure control section.
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13. The electronic device according to claim 13, comprising:
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first command generator which generates a command for writing or reading data into or from the first area;
second command generator which generates a command for requesting the secure control section to perform processing; and
first authentication processor which acquires an authentication key used for authentication with the secure control section and performs authentication processing with the secure control section. - View Dependent Claims (14)
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15. The electronic device according to claim 15, comprising:
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third command generator which generates a command for writing or reading data into or from the authentication area; and
second authentication processor which acquires an authentication key used for authentication with the general control section and performs authentication processing with the general control section.
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Specification