Storage device, an encrypting/decrypting device and method of accessing a non-volatile memory
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United States of America Patent
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Sep 24, 2002
Issued Date -
N/A
app pub date -
Jul 20, 2000
filing date -
Jan 21, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A storage device (10) has a flash memory (11), a controller (16) and a second ROM (15). In the flash memory (11), a data key is stored, which is a key unique to each storage device (10). In the second ROM (15), a system key is stored which is an encrypting key common to storage devices (10). The controller (16), when writing data, encrypts the data with the data and system keys and writes the encrypted data in the flash memory (11), and when reading data, decrypts the data with the data and system keys to output the decrypted data. The data key may be encrypted with the system key. In this case, when to write data, the controller (16) may decrypt the data key with the system key, and encrypt data with the decrypted key, and when to read data, the controller may decrypt the data key with the system key, and decrypt the encrypted data with the decrypted data key.
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