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Chapter 6 Oracle Encryption

will use the direct update of the table approach as an example.

Our redesigned table CLAIM_LINE looks like this

CLAIM_ID          NOT NULL NUMBER
LINE_ID           NOT NULL NUMBER
PROCEDURE_CODE             VARCHAR2(200)                  
CLAIM_AMOUNT               NUMBER(5)
PAID_AMOUNT                NUMBER(5)
 

Notice that procedure_code is now 200 characters long, enough to hold the encrypted value.

To hold the keys, we will design another table claim_line_keys as follows.

CLAIM_ID     NOT NULL NUMBER
LINE_ID      NOT NULL NUMBER
KEY_STRING   NOT NULL VARCHAR2(80)

The primary key is (CLAIM_ID, LINE_ID) and the key to encrypt the corresponding procedure code is stored in the column KEY_STRING.

The decryption will work as per Figure 6.1. We will get the encrypted value and the corresponding key, and feed them to the decryption process to get the original value.


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