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There are four major feature restrictions to be concerned with regarding the use of column level encryption. In the next section, Implementing Tablespace Encryption, we ll see how these limitations can be avoided entirely. But for now, it s important that you understand them. Here they are: Reduced ability to use indexes: Column level encryption will place encrypted values in the index. The index no longer stores data sorted in any useful fashion. The data is sorted, of course, but it is sorted by the encrypted values, not by the original data values. We can use the index for equality searches ( where encrypted_column = searches) but not for typical range scans ( where encrypted column > ). Reduced protection when using indexes: If you index an encrypted column, you may not use the SALT Oracle normally adds to the encrypted values. This is because we need to make sure the value we place into the index is a value we can find later! If we added some random bytes to every string and then place them in the index, we would never be able to use the index to find that string again since we wouldn t know what SALT to use! Inability to use function based indexes: Since an index is created against the encrypted data, the input to your function-based index would necessarily be the encrypted version of the data, which isn t very useful to you. Your function could not make any use of it. Creating function based indexes against encrypted columns is not supported in any sense. Inability to use foreign key constraints: Declarative referential integrity is not supported against encrypted keys.

Many times, these restrictions are perfectly workable Take our example from the preceding section with the CUSTOMER table and the encrypted CREDIT_CARD# column In that example, CREDIT_CARD# would never be indexed (we find a credit card by customer, we do not look up who owns a given credit card), so the first three restrictions do not hit us Also, CREDIT_CARD# would never be a primary key (it changes too frequently) and it is not unique; a husband and wife might have their own customer accounts with the same credit card on file, for example Therefore, it could never be in a foreign key So, in this case, the restrictions would not impact us at all However, sometimes there are attributes you would like to encrypt whereby these restrictions would play a large role.

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The method calls CanReadProperty(), which is part of the authorization rules subsystem I ll discuss in 10. That method checks to see whether the current user is allowed to read this property. If the user is not authorized, the method will either throw an exception or return False, depending on the value of the noAccess parameter. Assuming no exception is thrown (which is the default), then either the value or a dummy default value will be returned. If the user is authorized to read the value, she gets the real value; otherwise, she gets a dummy value. The ReadProperty() method is used to get the real value if appropriate. ReadProperty() is a Protected method of BusinessBase, so it s available in your business class as well. You should use GetProperty() when you want authorization rules to apply and ReadProperty() when you want to read the property regardless of authorization rules. Normally, the UI disables the display of values that the user is not authorized to see, so even if a dummy value is returned here, the user will never see it. In fact, this is why the default behavior is to return a dummy value if the user isn t authorized to see the real value. Both Windows Forms and WPF data binding typically read the value, even if the control isn t visible to the user. If the property Get throws an exception, then data binding will not work properly. Looking at the SetProperty() method in BusinessBase, you can see that it is even more complex: Protected Sub SetProperty(Of P)(ByVal propertyInfo As PropertyInfo(Of P), _ ByVal newValue As P, ByVal noAccess As Security.NoAccessBehavior) If CanWriteProperty(propertyInfo.Name, noAccess = _ Security.NoAccessBehavior.ThrowException) Then Try Dim oldValue As P = Nothing Dim fieldData = FieldManager.GetFieldData(propertyInfo)

For example, I ve seen systems where a social security number was used as a primary key to identify a person It should not have been because social security numbers are not immutable; therefore, they are not a good candidate for a primary key In these systems, the requirement to encrypt the social security number column would arise Now, since the social security number was used as a primary key, we know there is an index on that column Hence the first two restrictions may apply and the third one as well Additionally, if an attribute is a primary key in some table, there is a good chance it will be used as a foreign key in some other table, therefore the fourth restriction would become an issue.

To add insult to injury, since this was the primary key, it was accessed frequently, imposing the largest possible performance penalty because of the frequent accesses In this system, column level encryption may well be a large burden Remember, you need to understand how the data will be used in your application to make sensible decisions about the features you can use with it..

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