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What Encryption Is Not About
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Before we get into the details of how Oracle implements encryption at rest and how you would go about using it, I want to make one important point about encryption. This point goes to why you are encrypting data in the first place. There is exactly one reason to employ database encryption (encryption of data at rest) and that reason is to protect the data in the event of theft or loss. That s it to protect the data in the event the database itself is stolen. I mention this stress it, in fact because many people think they can or should use encryption for access control. I get this question frequently on http://asktom.oracle.com/. It takes the form of comments/questions such as:
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We are planning on upgrading to 10.2.0 and implementing Transparent Data Encryption to encrypt our credit card numbers in the database. But it looks like all TDE does is just to encrypt the data in the database at the column level but does not provide a way to limit access to the data at the column level One thing regarding TDE in 10gr2, I know it encrypts data and it is transparent, but does it do access control. Will it be able to restrict decryption to specific users But with TDE the data is still in clear text when you select it from the database...
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It is a common theme confusing encryption (used to protect data at rest from theft or loss) and access controls (limiting access to data in real time according to some rules). Access control rules exist to provide the following functionality: GRANT and REVOKE: This allows object level access on a user by user or system wide basis. Row Level Security: This prevents or allows access to specific rows in a given object either by user, by application, or by any developer dreamed of scheme. For example, in a medical records database, the developer could use row level security to allow access to a given row to a specific Doctor if the Doctor accesses that row
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CHAPTER 16 DATA ENCRYPTION
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from a certain hospital during a period of time that Doctor is scheduled to be working there. Otherwise, that Doctor will not have access. Column Level Security: This takes place via column masking to prevent or allow access to specific columns row by row (the user can see the row, but they are not allowed to see a certain column on certain rows). This can be implemented user by user, application by application, or by any sort of scheme the developer wants to implement, just like row level security.
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Encryption is used to protect the data when access controls are subverted, as they would be if someone has physical access to your database. If encryption worked like access controls, it could not protect the data at rest from theft since SYSDBA, for example, is never subject to access controls. SYSDBA can bypass everything. We need encryption as a stopgap on top of access controls in the event that access controls are subverted. In that case, we just want to prevent all access to the data, period.
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Implementing Manual Application Encryption
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In this and the next two major sections, we ll look at the three approaches a developer/DBA can use to encrypt data in the database. We ve had an overview of them already; now it is time to look at each in more depth. First up is Manual Application Encryption, which is achieved programmatically using one of two built-in packages: DBMS_OBFUSCATION_TOOLKIT: A package supplied with the database since Oracle 8i, it employs the Data Encryption Standard (DES) and Triple DES (3DES) encryption algorithms only. It is also capable of generating MD5 checksums of data. It can only work with RAW and VARCHAR datatypes. It should not be used for two reasons: it is deprecated as of Oracle 10g and above (replaced by the next package in this list) and the name is really hard to type and say out loud. DBMS_CRYPTO: In addition to being much easier to type and say, this is the currently supported encryption API. It supports a broader range of encryption algorithms including DES, 3DES, Rivest Cipher 4 (RC4), and Advanced Encryption Standard (AES). It is also capable of generating a variety of hashes and message authentication codes (MAC) such as MD5, MD4, SHA-1. It is capable of working with RAW, CLOB and BLOB datatypes.
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I will not be discussing the DBMS_OBFUSCATION_TOOLKIT package directly, but everything I say about the DBMS_CRYPTO package will apply to it as well.
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