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Chapter 6 Oracle Encryption

But what does that achieve? If the user has to supply the input vector (IV), the value could as well be unsecured.

That's where the design excels. The user never has to supply his or her IV in the process. It will be set automatically as a context attribute by the password authentication process. The function will have a call similar to:

set_claim_app_ctx ('input_vector',  
    'some_string_that_can_be_set_here');

This will set the attribute INPUT_VECTOR in the context claim_app_ctx to a value some_string_that_can_be_set_here. Inside the encryption and decryption routines shown earlier in this chapter, we will make additional calls to check this value by:

v_iv := sys_context ('claim_app_ctx', 'input_vector')

This will store the value of the attribute, if set, to the variable V_IV, which could then be converted to raw and used in the encryption and decryption. The modified decryption process is shown in Fig 6.2.


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