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Taylor, and E James Whitehead, Jr, Formal Modeling of Software Architectures at Multiple Levels of Abstraction (proceedings of the California Software Symposium, Los Angeles, CA, April 1996) Meier, Rene and Vinny Cahill, Taxonomy of Distributed Event-Based Programming Systems, The Computer Journal, June 24, 2005 Microsoft, Microsoft Message Queuing, wwwmicrosoftcom/windowsserver2003/technologies/ msmq/defaultmspx (technical report) Milojicic, Dejan S, Vana Kalogeraki, Rajan Lukose, Kiran Nagaraja, Jim Pruyne, Bruno Richard, Sami Rollins, and Zhichen Xu, Peer-to-Peer Computing, wwwhplhpcom/techreports/2002/ HPL-2002-57R1html (HP Labs technical report, 2002) Minsky, Naftaly H and David Rozenshtein, A Software Development Environment for LawGoverned Systems, ACM SIGPLAN Notices, February 1989..

Sometimes you may want to encrypt data (encode it so only users who are authorized can understand it). Oracle supports encryption of network data through its Advanced Security option. For encryption of data, Oracle provides two PL/SQL packages, the older of which is the DBMS_OBFUSCATION_ TOOLKIT package. This package enables data encryption by using the DES algorithm. The toolkit supports triple DES encryption for the highest level of security. It also supports the use of the MD5 secure cryptographic hash. You can also use the newer PL/SQL encryption package called DBMS_CRYPTO to encrypt and decrypt data. Compared to DBMS_OBFUSCATION_TOOLKIT, DBMS_CRYPTO provides a wider range of advanced security encryption and cryptographic algorithms and is easier to use. Oracle intends this package to replace the older DBMS_OBFUSCATION_TOOLKIT package. Whichever Oracle PL/SQL package you use, you have to manage the data encryption keys, which isn t a trivial task. You often have to create views to help you decrypt the encrypted data, which adds to the management tasks. In addition, you can t index the encrypted data according to Oracle s recommendations, which reduces the value of both of these encryption packages in several cases.

There is also a third, easier option: encrypting data with the transparent data encryption feature. The next section shows you how to easily encrypt Oracle table data using an Oracle Wallet to store encryption keys. You can index the encrypted table s columns as well, thus overcoming one of the biggest drawbacks in using the Oracle encryption packages.

Even with all kinds of access control mechanisms in place, you may ultimately come to the realization that your data is physically stored on a disk drive or tape somewhere, making it vulnerable to unauthorized access. You often come across situations where certain key column values in a table need to be encrypted to provide security. You can use the transparent data encryption feature to encrypt a column. Transparent data encryption means that the database will handle encryption and decryption automatically, without the user or the application having to manage the encryption key. This means the application no longer needs to handle the cumbersome process of managing the encryption key. For example, when you create a table, you can simply specify the ENCRYPT keyword along with the column name, as shown in the following example. This statement creates a table that converts the ssn column values into an encrypted data format when they are stored on disk: SQL> CREATE TABLE employees ( empno NUMBER(5) PRIMARY KEY ename VARCHAR2(15) NOT NULL, ssn NUMBER(9) ENCRYPT, . . . The ENCRYPT keyword in the preceding example specifies that the ssn (Social Security number) be encrypted. Once you do this, even if unauthorized users gain access to the data on your storage devices, they can t read the data, since it s encrypted. When authorized users access data, however, the encrypted data is automatically decrypted, and the decryption process is transparent to the user. An Oracle Wallet is used to store authentication and signing credentials, including private keys and certificates. Before you can start encrypting or decrypting a table, the encryption key is retrieved from the Oracle Wallet and stored in the SGA.