What encryption method is used for built-in password manager?

What changes were made between versions 3.6 and 4?

Data type is VARCHAR2:
SQL> desc dba_users;
Name                                      Null?    Type
USERNAME                                  NOT NULL VARCHAR2(30)
USER_ID                                   NOT NULL NUMBER
PASSWORD                                           VARCHAR2(30)
ACCOUNT_STATUS                            NOT NULL VARCHAR2(32)
LOCK_DATE                                          DATE
EXPIRY_DATE                                        DATE
DEFAULT_TABLESPACE                        NOT NULL VARCHAR2(30)
TEMPORARY_TABLESPACE                      NOT NULL VARCHAR2(30)
CREATED                                   NOT NULL DATE
PROFILE                                   NOT NULL VARCHAR2(30)
INITIAL_RSRC_CONSUMER_GROUP                        VARCHAR2(30)
EXTERNAL_NAME                                      VARCHAR2(4000)
PASSWORD_VERSIONS                                  VARCHAR2(8)
EDITIONS_ENABLED                                   VARCHAR2(1)
AUTHENTICATION_TYPE                                VARCHAR2(8)You can use SQL function ORA_HASH to hash password: http://download.oracle.com/docs/cd/E11882_01/server.112/e17118/functions124.htm#SQLRF06313.

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    PASSWORD                                           VARCHAR2(30)
    ACCOUNT_STATUS                            NOT NULL VARCHAR2(32)
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