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Chapter 6 Oracle Encryption
 

Figure 6.2 Decryption Process with Input Vector

Using an IV in the encryption process will require the same IV to be applied during the decryption process. If the user somehow gets into the database, learns the keys and tries to steal the procedure codes, he or she will not be successful. Reason: the IV value, which is another key in the process, will not be set in that manner.

As we saw in Chapter 4, the only way the application context attributes can be set is through a trusted procedure, never independently. This will prevent the hacker from setting the value of input_vector to the expected string some_string_that_can_be_set_here and therefore the decryption will never be successful. Similarly, if the hacker tries to set another value of the input vector in the encryption process, he or she will not be successful, either.


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