| 摘要 |
An encryption/decryption processing unit performs encryption/decryption processing of data transmitted from a host system, and encryption/decryption processing of key data used for encryption/decryption of the data. A key data buffer temporarily stores encrypted key data. A key data buffer temporarily stores unencrypted key data. An external memory interface controls flash memory attached outside, and reads/writes encrypted key data stored in the key data buffer.
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