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CHAPTER 16 DATA ENCRYPTION
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Implementing Tablespace Encryption
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Tablespace encryption, introduced in Oracle Database 11g Release 1, is the ability to have each and every database block located in a given tablespace be stored in an encrypted format on disk. Every segment stored within that tablespace will be stored encrypted. This goes far beyond the column level encryption we just discussed. Every column in every table stored in this tablespace would be encrypted on disk, as would be the contents of every INDEX, LOBSEGMENT, and so on. Furthermore, the documented limitations of column encryption regarding statistics, indexes, and foreign keys do not apply to encrypted tablespaces. There are no restrictions when looking at tablespace encryption. In this section, we ll look at how to setup and use tablespace encryption, how the data is physically stored on disk and in the SGA, and how to measure the performance impact of tablespace encryption.
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How to Use Tablespace Encryption
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In order to use tablespace encryption, you start off just as you would for column level encryption by setting up your Oracle wallet for the database to store and supply the encryption keys. Once that is done, you are ready to create an encrypted tablespace using the following syntax create tablespace tablespace_name datafile ENCRYPTION Using 'algorithm' (optional) default storage ( ENCRYPT ); where algorithm is one of 3DES168, AES128, AES192, and AES256 to specify the type of encryption to be used (AES128 is the current default). The algorithm is optional as it will default, but the two parts in bold are required to create an encrypted tablespace.
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Note You cannot encrypt an existing tablespace; you must create a tablespace in encrypted mode. In order to
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effectively encrypt an existing tablespace, you would have to create a new encrypted tablespace, move the segments from the old tablespace to this new one, drop the old tablespace, and optionally rename the new tablespace to the old name.
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Once you have created an encrypted tablespace, you are ready to store data in an encrypted fashion. All you need to do now is create some segments (tables, indexes, and so on) in that tablespace. As the data is written to the datafiles for that tablespace, it will be encrypted transparently. As the data is read back in from those same datafiles, it will be decrypted transparently.
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Data Storage with Tablespace Encryption
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In this section, we ll take a look at how the encrypted database blocks are stored on disk and in the SGA. We ll look at the same considerations we did for column level encryption any storage overhead as well as the impact of data retrieval and modifications due to the encryption. We ll start with how the data is stored on disk.
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CHAPTER 16 DATA ENCRYPTION
Storage on Disk
Unlike column level encryption, there is no storage overhead with tablespace compression. There is no need to pad the data out to any multiple of 16 bytes, since every database block is some multiple of a kilobyte already (by definition, a database block is already a multiple of 16 bytes). Additionally, since a database block is a fixed width data element (there is no such thing as a varying length database block), the fact that encryption would result in a fixed width output is not relevant either. Lastly, since each database block is a unique entity, the data on it is unique already, so the need to SALT the data does not exist; we need not add anything to the database block data in an attempt to make it unique to avoid issues with probing of the data, as we do with data at the column level. So, with tablespace encryption, if a full, unencrypted tablespace consumes 5GB on disk, the same data stored in an encrypted tablespace would utilize the same 5GB of storage. In the datafiles, the datafile header itself would be stored unencrypted (so the database can identify and access the file with or without the wallet), but every database block in it would be stored encrypted, inaccessible by anyone when the wallet is not open in the database instance.
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