Password-Mode Decryption RMAN Backup

For security reasons, after making an encryption RMAN backups, we can decrypt our backups using the same password of the backup.

Step 1: trying to decrypt an encrypted backup without putting the password

RMAN> alter tablespace users offline immediate;
 using target database control file instead of recovery catalog
 Statement processed
 RMAN> 
 RMAN> restore tablespace users;
 Starting restore at 28-OCT-20
 allocated channel: ORA_DISK_1
 channel ORA_DISK_1: SID=1 device type=DISK
 channel ORA_DISK_1: starting datafile backup set restore
 channel ORA_DISK_1: specifying datafile(s) to restore from backup set
 channel ORA_DISK_1: restoring datafile 00007 to /u01/app/oracle/oradata/orcl/users01.dbf
 channel ORA_DISK_1: reading from backup piece /u01/app/oracle/product/12.2.0/dbhome_1/dbs/030bs0ts_1_1
 RMAN-00571: ===========================================================
 RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
 RMAN-00571: ===========================================================
 RMAN-03002: failure of restore command at 10/28/2020 16:45:15
 ORA-19870: error while restoring backup piece /u01/app/oracle/product/12.2.0/dbhome_1/dbs/030bs0ts_1_1
 ORA-19913: unable to decrypt backup
 ORA-28365: wallet is not open
 RMAN> 

Step 2: Set password for decryption:

RMAN> SET DECRYPTION IDENTIFIED BY "oracle_4U" ;
 executing command: SET decryption
 RMAN> 
 RMAN> restore tablespace users;
 Starting restore at 28-OCT-20
 using channel ORA_DISK_1
 channel ORA_DISK_1: starting datafile backup set restore
 channel ORA_DISK_1: specifying datafile(s) to restore from backup set
 channel ORA_DISK_1: restoring datafile 00007 to /u01/app/oracle/oradata/orcl/users01.dbf
 channel ORA_DISK_1: reading from backup piece /u01/app/oracle/product/12.2.0/dbhome_1/dbs/030bs0ts_1_1
 channel ORA_DISK_1: piece handle=/u01/app/oracle/product/12.2.0/dbhome_1/dbs/030bs0ts_1_1 tag=FULL_ENCRYPTION_BACKUP
 channel ORA_DISK_1: restored backup piece 1
 channel ORA_DISK_1: restore complete, elapsed time: 00:00:01
 Finished restore at 28-OCT-20
 RMAN> recover tablespace users;
 Starting recover at 28-OCT-20
 using channel ORA_DISK_1
 starting media recovery
 media recovery complete, elapsed time: 00:00:00
 Finished recover at 28-OCT-20
 RMAN> alter tablespace users online;
 Statement processed

Enjoy!