GV$RMAN_ENCRYPTION_ALGORITHMS

select
inst_id,                 -- INST_ID NUMBER
id,                      -- ALGORITHM_ID NUMBER
algname,                 -- ALGORITHM_NAME VARCHAR2(64)
algdesc,                 -- ALGORITHM_DESCRIPTION VARCHAR2(64)
decode                   -- IS_DEFAULT VARCHAR2(3)
  (isdefault, 0, 'NO', 'YES'),
decode                   -- RESTORE_ONLY VARCHAR2(3)
  (restore_only, 0, 'NO', 'YES') 
from
x$krbza
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