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CHAPTER 16 DATA ENCRYPTION
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ops$tkyte%ORA11GR2> alter system set encryption wallet open identified by foobar; System altered. ops$tkyte%ORA11GR2> select * from t; C1 C2 ------------------------------ -----------------------------this_is_NOT_encrypted this_is_encrypted this_is_NOT_encrypted The second thing to look at would be the contents of the datafile itself, the data at rest on disk. Previously, we saw how easy it was to view data in an Oracle datafile just using the strings utility. If we attempt that on this datafile, this is what we might expect to see: ops$tkyte%ORA11GR2> alter system checkpoint; System altered. ops$tkyte%ORA11GR2> column file_name new_val f ops$tkyte%ORA11GR2> select file_name 2 from dba_data_files 3 where tablespace_name = 'TDE_TEST'; FILE_NAME -----------------------------/home/ora11gr2/app/ora11gr2/or adata/ora11utf/ORA11UTF/datafi le/o1_mf_tde_test_602pjwy8_.db f ops$tkyte%ORA11GR2> !strings -a &F }|{z }ORA11UTFg TDE_TEST this_is_NOT_encrypted, this_is_NOT_encryptedDl ops$tkyte%ORA11GR2> While this is not definitive proof that the data on disk is encrypted you could dump database blocks or use a binary file editor to prove it further if you like it is certainly an indication that the data is not stored in the clear on disk anymore. The encrypted data isn t stored in the clear on disk, that is; the non-encrypted data clearly is stored in the clear, easily viewable with or without the Oracle software. What you ve just seen is an introduction to column level encryption. In the section Implementing Column Level Encryption, we ll be exploring details such as the storage overhead associated with column level encryption, indexing restrictions and limitations, restrictions with respect to referential integrity constraints, and performance implications.
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Transparent tablespace encryption was introduced in Oracle Database 11g Release 1. Whereas column level encryption encrypted individual columns, tablespace encryption, as its name implies, encrypts the contents of an entire tablespace. Every database block stored in that tablespace will be encrypted, every byte of data on every block will be encrypted. Therefore, if you create a table in an encrypted tablespace,
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CHAPTER 16 DATA ENCRYPTION
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every single column in that table will be encrypted. In fact, every segment you create in that tablespace will be stored on disk in an encrypted format INDEX, LOBSEGMENT, TABLE PARTITIONS whatever is stored in that tablespace will be stored encrypted on disk. Tablespace encryption is easy to implement once the Oracle wallet is in place. All it requires is the use of the ENCRYPTION clause (with or without any of the options available for it) on the CREATE TABLESPACE command. For example, we ll create two tablespaces, one without encryption named CLEAR and one with encryption enabled named ENCRYPTED: ops$tkyte%ORA11GR2> create tablespace clear 2 datafile '/tmp/clear.dbf' size 1m; Tablespace created. ops$tkyte%ORA11GR2> create tablespace encrypted 2 datafile '/tmp/encrypted.dbf' size 1m 3 ENCRYPTION default storage ( ENCRYPT ); Tablespace created. Now, if we create a table in the tablespace named CLEAR and index it: ops$tkyte%ORA11GR2> create table t 2 tablespace clear 3 as 4 select * 5 from all_users 6 / Table created. ops$tkyte%ORA11GR2> create index t_idx 2 on t(lower(username)) 3 tablespace clear; Index created. We can definitely see that data stored on disk in a clearly readable format: ops$tkyte%ORA11GR2> !strings /tmp/clear.dbf | grep -i ops.tkyte OPS$TKYTE ops$tkyte ops$tkyte%ORA11GR2> You can definitely see the data from the table, OPS$TKYTE, in uppercase and the lower case version of it that was stored in the index. If this table was deemed to contain sensitive data and you wanted to protect it and all if its contents, you would have to move this data to a tablespace utilizing encryption. You could, if you desired, encrypt just the columns you wanted encrypted using the ALTER TABLE command to modify the columns, but that might introduce some restrictions having to do with column level encryption. Specifically, as we ll see in the section Implementing Column Level Encryption, the use of a function based index would be prohibited. So for example, if you tried to use column level encryption on the USERNAME column, you would discover: ops$tkyte%ORA11GR2> alter table t 2 modify username encrypt; modify username encrypt * ERROR at line 2: ORA-28348: index defined on the specified column cannot be encrypted
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