How to conduct Tablespace encryption in 11gR1

hi,
i recently completed 10g upgrade to 11gr1 (11.0.6). upgrade is completed and successful.
Now there is 1 read only tablespace which has HR data(ssn, credit card, birth date etc) which i need to encrypt.
I know high level steps is
1; use expdp table the tablespace export
2: drop the tablespace
3; recreate new encrypted tablespace
4:import into new encrypted tablepsace
i have not used expdp and encryption in past.
what syntax i need to use for expdp to conduct tabelspace export.

So following steps have valid syntax?
sqlplus " /as sysdba"
sql>drop tablespace lawtbs;
sql>ALTER SYSTEM SET ENCRYPTION KEY IDENTIFIED BY “lawtbs011”;
sql>CREATE TABLESPACE lawtbs
DATAFILE ‘/u01/app/oracle/oradata/lawtbs_data_01.dbf’ SIZE 2040m,
'/u01/app/oracle/oradata/lawtbs_data_02.dbf’ SIZE 2040m
ENCRYPTION USING ‘AES256
DEFAULT STORAGE(ENCRYPT);
sql>create or replace directory imp_dir as '/u01/app/import_ts';
sql>exit;
$impdp system/<passwd> tablespaces=lawtbs directory=imp_dir dumpfile=expdp_tbs.dmp logfile=impdp_tbs.log

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How to conduct Tablespace encryption in 11gR1

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