| 摘要 |
An approach is provided for securely storing sensitive data values. A primary facility is provided that directly or indirectly receives requests from a requestor to store an actual data value. The primary facility obtains a replacement value associated with the actual value and encrypts the actual value, and the replacement value is transmitted to the requestor. The replacement and encrypted values are stored in a master copy database at the primary facility, and copies thereof are stored in distributed secondary databases. When the requestor needs an actual data value, the requestor transmits the replacement value either to the primary facility for retrieval of data from the master database, or to the secondary facility for retrieval from the respective secondary database. The chosen facility retrieves the encrypted value from its respective database using the replacement value, decrypts the encrypted value, and transmits the actual value back to the requestor.
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