Oracle Database 10g introduces new and powerful security features to meet the most demanding security requirements. For over 25 years Oracle has delivered state-of-the-art database security to government and commercial customers worldwide. Oracle Database 10g continues that tradition by introducing exciting new enhancements to encryption, virtual private database, label security, auditing and directory based user management. Oracle Database 10g has tight integration with Oracle Identity Management to facility enterprise wide provisioning and administration. Efficient identity life-cycle management is a top priority for IT departments as organizations grow and transform. Application users must be centrally provisioned for the enterprise and not managed in twenty different applications and databases. Oracle Database 10g Release 2 introduces Transparent Data Encryption, the most exciting new security feature since the introduction of Virtual Private Database and the most advanced database encryption solution available. This paper presents an overview of Oracle Database 10g Security and introduces Transparent Data Encryption.