One of the newer features added since oracle8i is data encryption. Oracle has supplied a new package called dbms_obfuscation_toolkit which allows you to encrypt and decrypt strings. This functionality will be particularly useful for data encryption when sensitive data like passwords and social security numbers are stored within the database. This article gives an example on encryption and decryption using the dbms_obfuscation_toolkit package.
visit http://www.dbasupport.com/oracle/ora9i/DBMS_OBFUSCATION_TOOLKIT.shtml for more info
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