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they are hooked into the application at the correct places Whenever data comes into the database, you are responsible for encrypting the data, and whenever it leaves, you are responsible for decrypting it This comes at the expense of yet more code to be developed as well as a definite performance impact, which we ll measure shortly A third reason to give serious thought before employing manual application encryption is that the application has to be involved in the process; in fact, every application that touches this data will have to be involved This is because the column that will be encrypted must (I stress the word must here) use the RAW datatype as its underlying datatype If you are to encrypt a LAST_NAME column that was originally defined as a VARCHAR2(70), you will be redefining that column to be a RAW(80).

You must use a RAW datatype because the result of encrypting data is a binary set of bytes; they are not characters You cannot store them in a character datatype such as VARCHAR2 I ll refer you to 12 Datatypes and the discussion on NLS character set conversion for the reason why this is so The VARCHAR2 type is subject to character set conversion and the bytes that one client sees can and will be different from the bytes another client sees in a VARCHAR2 string When dealing with true character strings, it is definitely a bad thing; it s called corrupting the data Character set conversion would tend to change the encrypted data, making it so you cannot decrypt it anymore (that is, you just lost it forever) I ve seen that happen more than once in real life.

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<Transactional(TransactionalTypes.TransactionScope)> _ Protected Overrides Sub DataPortal_Insert() ' TODO: insert values End Sub <Transactional(TransactionalTypes.TransactionScope)> _ Protected Overrides Sub DataPortal_Update() ' TODO: update values End Sub <Transactional(TransactionalTypes.TransactionScope)> _ Protected Overrides Sub DataPortal_DeleteSelf() DataPortal_Delete(New SingleCriteria(Of SwitchableObject, Integer)(Me.Id)) End Sub <Transactional(TransactionalTypes.TransactionScope)> _ Private Sub DataPortal_Delete(ByVal criteria _ As SingleCriteria(Of SwitchableObject, Integer)) ' TODO: delete values End Sub #End Region This is the same code you d see in an editable root object. You ll also need a region for the child scenario. #Region "Child Data Access" Protected Overrides Sub Child_Create() ' TODO: load default values ' omit this override if you have no defaults to set MyBase.Child_Create() End Sub Private Sub Child_Fetch(ByVal childData As Object) ' TODO: load values End Sub Private Sub Child_Insert(ByVal parent As Object) ' TODO: insert values End Sub Private Sub Child_Update(ByVal parent As Object) ' TODO: update values End Sub Private Sub Child_DeleteSelf(ByVal parent As Object) ' TODO: delete values End Sub #End Region Again, this is the same code you d see in an editable child. The result is that the object is treated as a root object when the Public factory methods are called and as a child when the Friend factory methods are called. The data portal takes care of calling MarkAsChild() and managing the object s state, as shown previously in Tables 5-1 and 5-2.

The developers used a VARCHAR2 to store encrypted data and the fact that the conversion had taken place was not detected for some time, effectively destroying that bit of data If it had been detected early, near the point of the corruption being introduced, we could have resurrected the data from backups (before the implicit conversion corrupted it) but it would have been a non-trivial task Also, note that I said that a VARCHAR2(70) would require a RAW(80) This is because encrypted data is stored in multiples of 16 bytes It takes five 16 byte pieces of raw data to store 70 single byte characters (or 71, 72 and so on) So unless your existing data attribute byte length is divisible by 16, you ll be computing a new field length.

Again, a mistake I ve frequently seen is for a developer to try to store the encrypted data in the existing VARCHAR2(70) field it won t work because of the implicit character set conversion that will corrupt the data some day, and it won t work because it simply won t fit in that field Sure, some of the data will any of the data that was 64 bytes or less before encrypting would fit, but a value that was 65 bytes or more would need 80 bytes after encrypting This gets even worse when you start considering multibyte data!.

The preceding considerations ultimately impact your ability to maintain accurate and synchronized time on your network.

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