You can use PROUTIL EPOLICY MANAGE to change the cipher of a policy.

  1. To change the cipher of a policy, enter: 
    proutil dbname -C epolicy manage object-type cipher object-name -Cipher cipher-num
  2. Next, update the object data to the new encryption type: 
    proutil dbname -C epolicy manage object-type update object-name

    You can only rekey or change the cipher of objects that have previously been encrypted.