This article provides a comprehensive guide to implementing Oracle Transparent Data Encryption (TDE) on Amazon RDS Custom for Oracle non-CDB environments to secure data at rest.

• AWS ending RDS Custom for Oracle support on March 31, 2027; customers should migrate to EC2
• TDE encrypts sensitive data in tables and tablespaces using two-layer encryption key mechanism
• Requires Oracle Enterprise Edition with Advanced Security Option license
• Implementation involves setting WALLET_ROOT and TDE_CONFIGURATION parameters, creating keystores
• Local auto-login software keystores recommended for enhanced security on single machines
• Database restart required after parameter configuration changes
• Wallet backups automatically included in RDS automated backups and snapshots
• Maintenance operations like patching, PITR, read replicas may require manual wallet file recreation
• Regular key rekeying and password changes recommended for ongoing security
• TDE configuration must persist through database lifecycle management to avoid data loss

The guide emphasizes testing in non-production environments first and maintaining wallet backups for disaster recovery scenarios.