Error
Error Code: ORA-28409

Oracle ORA-28409: Decryption Failed

📦 Oracle Database
📋

Description

The ORA-28409 error indicates that decryption using the provided passphrase has failed in Oracle Database. This typically occurs when attempting to access encrypted data or perform operations requiring decryption with an incorrect or missing passphrase.
💬

Error Message

ORA-28409: decryption using passphrase failed
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Known Causes

3 known causes
⚠️
Invalid Passphrase
The passphrase provided for decryption is incorrect or does not match the passphrase used during encryption. Verify the passphrase for accuracy.
⚠️
Missing Passphrase
The necessary passphrase was not provided when attempting to decrypt the data. Ensure the application is correctly configured to supply the required passphrase.
⚠️
Internal Error
An internal error within the decryption process has occurred, possibly due to corruption or a software defect. This is less common and may require further investigation.
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Solutions

4 solutions available

1. Verify Passphrase Correctness and Case Sensitivity easy

Ensure the passphrase used for decryption exactly matches the one used for encryption, paying close attention to case and special characters.

1
Identify the operation that is failing with ORA-28409. This is typically when trying to access encrypted data or perform decryption operations.
2
Retrieve the passphrase that was used when the data was originally encrypted. This might be stored in a secure vault, configuration file, or remembered by the application developer.
3
Carefully re-enter the passphrase, paying strict attention to capitalization, spaces, and any special characters. Oracle's encryption is case-sensitive.
4
If the passphrase is being passed programmatically, verify the string literal or variable holding the passphrase for any accidental modifications or typos.
5
If possible, re-encrypt a small sample of data with the known correct passphrase and then attempt to decrypt it to confirm the passphrase is indeed the issue.
BEGIN
  DBMS_CRYPTO.SET_PASSPHRASE('your_known_correct_passphrase');
  -- Perform decryption operation here
END;
/

2. Check Oracle Wallet Configuration for Transparent Data Encryption (TDE) medium

For TDE, confirm that the Oracle Wallet containing the master encryption key is accessible and correctly configured.

1
Identify if the ORA-28409 error is occurring in the context of Transparent Data Encryption (TDE) for tablespaces or columns.
2
Locate the Oracle Wallet directory on the database server. This is typically defined by the `ENCRYPTION_WALLET_LOCATION` parameter in `sqlnet.ora` or by environment variables.
3
Ensure the Oracle database process has read permissions to the wallet directory and its contents.
4
Verify that the `sqlnet.ora` file (located in `$ORACLE_HOME/network/admin` or specified by `TNS_ADMIN`) is correctly configured with the `ENCRYPTION_WALLET_LOCATION` parameter pointing to the wallet's path.
ENCRYPTION_WALLET_LOCATION=(DIRECTORY='/opt/oracle/oradata/wallet')
5
Use `orapki` to check the status of the wallet and list its contents. Ensure the master encryption key is present.
orapki wallet display -wallet /opt/oracle/oradata/wallet -pwd <wallet_password>
6
If the wallet is password-protected, ensure the correct password is being used when the database attempts to access it. This password is often managed as part of the database startup process or via `ALTER SYSTEM SET ENCRYPTION WALLET OPEN IDENTIFIED BY '<wallet_password>';`.
ALTER SYSTEM SET ENCRYPTION WALLET OPEN IDENTIFIED BY 'your_wallet_password';
-- Or for automatic opening on startup, ensure the password is set in the OS keyring or other secure mechanism.
7
Restart the database instance after making any changes to `sqlnet.ora` or wallet configuration to ensure the new settings are applied.
SQL> SHUTDOWN IMMEDIATE;
SQL> STARTUP;

3. Re-establish Encryption Context with Correct Passphrase medium

If the encryption context was lost or corrupted, re-establish it using the correct passphrase before attempting decryption.

1
Determine if the error is related to a specific `DBMS_CRYPTO` operation where a passphrase is explicitly provided.
2
Locate the PL/SQL block or application code that performs the encryption and decryption.
3
Ensure that the `DBMS_CRYPTO.SET_PASSPHRASE` procedure is called with the correct, case-sensitive passphrase immediately before any decryption operation that relies on it.
BEGIN
  -- Ensure the correct passphrase is set
  DBMS_CRYPTO.SET_PASSPHRASE('your_correct_passphrase_here');

  -- Example of decrypting data
  DECLARE
    encrypted_data BLOB := HEXTORAW('...'); -- Your encrypted data in hex format
    decrypted_data BLOB;
  BEGIN
    decrypted_data := DBMS_CRYPTO.DECRYPT(
      src => encrypted_data,
      key => DBMS_CRYPTO.HASH(UTL_RAW.CAST_TO_RAW('your_correct_passphrase_here'), DBMS_CRYPTO.HASH_SH256),
      cipher => DBMS_CRYPTO.AES_CBC_256
    );
    -- Process decrypted_data
  END;
END;
/
4
If the passphrase is stored in a variable, ensure the variable is correctly populated and has not been inadvertently altered.
5
Consider if the encryption algorithm or mode used for decryption differs from the one used for encryption. They must match.

4. Investigate Potential Key Corruption or Incompatibility advanced

Rule out issues with the encryption key itself, such as corruption or using a key with an incompatible algorithm or version.

1
If using TDE, check the `DBA_ENCRYPTED_COLUMNS` or `DBA_TABLESPACES` views to identify which master key is being used for the encrypted object.
SELECT owner, table_name, column_name, encryption_algorithm, encryption_mode FROM dba_encrypted_columns WHERE owner = 'YOUR_SCHEMA_NAME';
SELECT tablespace_name, encrypted_tablespace FROM dba_tablespaces WHERE encrypted_tablespace IS NOT NULL;
2
Examine the Oracle Alert Log for any related errors during database startup or when accessing encrypted data. These might provide clues about key loading issues.
3
If the master encryption key was generated using a specific algorithm and version, ensure that the `DBMS_CRYPTO` package or TDE configuration is using a compatible version. Oracle versions might have different default algorithms or key strengths.
4
In rare cases, the master encryption key stored within the wallet might become corrupted. If you have a backup of the wallet or a previous version of the master key, consider restoring it. **Caution**: This is a high-risk operation and should be performed with extreme care and a full backup.
5
If you suspect key corruption and have no backups, you may need to re-encrypt the data using a new master key. This is a significant undertaking and requires careful planning.