![]() Using online or offline encryption of existing un-encrypted tablespaces enables you to implement Transparent Data Encryption with little or no downtime. ![]() In a multitenant environment, we can configure Keystorefor either the entire container database (CDB) called as United mode or for individual pluggable databases (PDBs) called as Isolated mode. To prevent unauthorized decryption, TDE stores the encryption keys in an external security module ( software or external Keystore) external to the database, called a Keystore. TDE helps protect data stored on media (also called data at rest) if the storage media or data file is stolen. After the data is encrypted, this data is transparently decrypted for authorized users or applications when they access this data. TDE can be applied to individual columns or entire tablespaces. Transparent Data Encryption (TDE) enables to encrypt sensitive data that stored in tables and tablespaces.
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