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Pin numbers appear on the outside of objects, right next to the related pins. If an object has many pins, it becomes tedious to locate a pin by its number, unless the numbers are in some sort of order. In Figure 7-26, the pins were ordered sequentially, following a counterclockwise direction. This happens to be the same convention used by ICs, when viewed from the topside.

If you check the employees table now, you ll find that the ssn, encrypt_id, and emp_id columns are all encrypted: SQL> DESCRIBE employees NAME -----------FIRST_NAME LAST_NAME EMP_ID SALARY SSN ENCRYPT_ID SQL> NULL ------TYPE ----------------VARCHAR2(30) VARCHAR2(30) NUMBER(9) ENCRYPT NUMBER(6) NUMBER(9) ENCRYPT NUMBER(9) ENCRYPT

Note that encrypting data will result in a performance hit, especially when users are selecting or inserting data. If you decide you want to turn off encryption for any reason, you can do so by using the DECRYPT keyword, as shown here: SQL> ALTER TABLE employees MODIFY (ssn DECRYPT);

The encrypted columns in the employees table use the default encryption algorithm. This default encryption algorithm uses salt, which involves adding a random string to data before it s encrypted, thus making it harder for someone to match patterns in the text. As mentioned earlier, you can index transparently encrypted columns, but Oracle recommends that you not use salt if you plan on using indexes on the encrypted columns. If you don t wish to use salt, specify the ENCRYPT NO SALT option when you encrypt a column. Similarly, if you wish to use a nondefault encryption algorithm, you can do so by specifying the algorithm when you encrypt the column, as shown in the following example, where the 3DES168 algorithm is used: ssn NUMBER(9) ENCRYPT USING '3DES168'

Pin numbers are especially useful when pin names are insufficient to describe a pin and you want to provide detailed information in a separate pin-legend table. For pins related to PC signals, it may be useful to show the signatures of the methods called. For pins related to SR signals, a description of the data messages may be necessary. Table 7-3 shows an example of a pin legend for the previous diagram.

You can use the DBMS_OBFUSCATION_TOOLKIT and the DBMS_CRYPTO packages provided by Oracle to implement encryption of data. Both these packages, however, impose a burden on you in the sense that your application must manage the encryption keys as well as call the APIs to encrypt and decrypt the data. To overcome these drawbacks, Oracle Database 10g introduced Transparent Data Encryption (TDE), which enabled you to encrypt columns in a table. The feature is called transparent because the database takes care of all the encryption and decryption details. In Oracle Database 11g, you can also encrypt an entire tablespace. In fact, tablespace encryption helps you get around some of the restrictions imposed on encrypting a column in a table through the TDE feature. For example, you can get around the restriction that makes it impossible for you to encrypt a column that s part of a foreign key or that s used in another constraint, by using tablespace encryption.

You must be aware of the following restrictions on encrypting tablespaces. You Can t encrypt a temporary or an undo tablespace. Can t change the security key of an encrypted tablespace. Can t encrypt an external table.

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As with TDE, you need to create an Oracle Wallet to implement tablespace encryption. Therefore, let s first create an Oracle Wallet before exploring how to encrypt a tablespace.