Storage card with integral file system, access control and cryptographic support

• US 6,845,908 B2
• Filed: 03/18/2002
• Issued: 01/25/2005
• Est. Priority Date: 03/18/2002
• Status: Expired due to Fees

• Current Assignee: Renesas Electronics America Inc.(f/k/a Integrated Device Technology, Inc) (Renesas Electronics Corporation)
• Original Assignee: Hitachi Semiconductor Incorporated (Hitachi, Ltd.)
• Inventors: Kawasaki, Shumpei, Morita, Toshiyasu
• Primary Examiner(s): Lee, Diane I.
• Application Number:
  US10/101,387
• Publication Number:
  US 20030173400A1
• Time in Patent Office: 1,044 Days
• Field of Search: 235/380, 235/379, 235/382, 235/492, 705/64, 705/67, 705/70, 705/72, 705/51, 380/255, 380/259, 380/277, 189/189, 713/189
• US Class Current: 235/382
• CPC Class Codes: G06F 21/78 to assure secure storage of data address-based protection against unauthorised use of memory G06F12/14; record carriers for use with machines and with at least a part designed to carry digital markings G06K19/00

Abstract

A storage card includes non-volatile memory; an authentication engine capable to authenticate a password and transmit authorization to read from and write to files; a file system, coupled to the authentication engine, capable to receive file commands from a computer, receive authorization from the authentication engine, and to transmit file instructions; and a sector driver, coupled to the file system and the memory, capable to read from and write to the memory in response to the instructions received from the file system.

Claims

1. A portable storage device that can be removably coupled to a computer, comprising:

data storage;

an authentication engine capable to authenticate a password and to transmit authorization to access the data storage;

a file system, coupled to the authentication engine, capable to receive a file access request from the computer, to receive authorization from the authentication engine, and to control execution of the file access request.

2. The device of claim 1, further comprising an encryption engine, coupled to the file system, capable to encrypt files before storage in the data storage and to decrypt files stored in the data storage memory.

3. The device of claim 2, wherein the encryption engine uses at least one of symmetric encryption and asymmetric encryption.

4. The device of claim 1, wherein the device further comprises:

a sector driver, coupled to the file system and the data storage, capable to access the data storage in response to the instructions received from the file system.

5. The device of claim 1, wherein the authentication engine receives a password from the computer.

6. The device of claim 5, further comprising a biometric reader integral with the device and coupled to the authentication engine, and wherein the password includes biometric data received from the biometric reader.

7. The device of claim 6, wherein the biometric reader includes a fingerprint scanner.

8. The device of claim 1, further comprising a single input/output interface for temporarily communicatively coupling the device to the computer and wherein the authentication engine and file system both communicate with the computer via the single interface.

9. The device of claim 1, wherein the device is tamper proofed.

10. A method implemented in a portable storage device, comprising:

receiving a write request by a file system in the portable storage device from a computer, the write request including data;

receiving a password;

authenticating the password;

encrypting the data if the password is authenticated; and

using the file system to write the encrypted data and a decryption key to data storage within the portable storage device if the password is authenticated.

11. The method of claim 10, wherein the encrypting uses a symmetric encryption algorithm.

12. The method of claim 10, wherein the encrypting uses an asymmetric encryption algorithm.

13. The method of claim 10, wherein the password is received from a computer.

14. The method of claim 10, wherein the password includes biometric data from a biometric reader that is integral with the portable storage device.

15. The method of claim 14, wherein the biometric data includes a fingerprint.

16. A method implemented in a portable storage device, comprising:

receiving a read request from a computer by a file system in the portable storage device;

receiving a password; and

authenticating the password;

using the file system to access data storage in the portable storage device to obtain an encrypted file associated with the read request from the data storage, if the password is authenticated;

decrypting the encrypted file associated with the read request if the password is authenticated; and

transmitting the decrypted file to the computer if the password is authenticated.

17. The method of claim 16, wherein the password is received from a computer.

18. The method of claim 16, wherein the password includes biometric data from a biometric reader that is integral with the portable storage device.

19. The method of claim 18, wherein the biometric data includes a fingerprint.

20. A portable storage apparatus capable of being removably coupled to a computer, comprising:

data storage for storing data, the data storage having a directory area;

a file name analyzer capable to receive a file name from the computer and to obtain data storage location information corresponding to the file name from the directory area in the data storage; and

a sector driver, coupled to the file name analyzer, capable to receive the location information from the file name analyzer and to retrieve data corresponding to the data storage location information from the data storage.

21. The apparatus of claim 20, further comprising an encryption engine, coupled to the sector driver, capable to decrypt files in the data storage.

22. The apparatus of claim 20, wherein the sector driver is further capable to write to the data storage.

23. The apparatus of claim 20, wherein the device is tamper proofed.

24. The apparatus of claim 20, further comprising an authentication engine, coupled to the file name analyzer, capable to receive and authenticate a password and wherein the sector driver is capable to get data only after password authentication.

25. A method implemented in a portable storage device, comprising:

receiving a read request from a computer by a file system in the portable storage device;

receiving a password;

authenticating the password; and

using the file system to transmit a file associated with the read request from data storage within the portable storage device to the computer if the password is authenticated.

26. The method of claim 25, wherein the password is received from a computer.

27. The method of claim 25, wherein the password includes biometric data from a biometric reader that is integral with the portable storage device.

28. The method of claim 25, wherein the biometric data includes a fingerprint.

29. The method of claim 25, further comprising decrypting the file before transmitting the file if the password is authenticated.