DBMS_ASSERT is an Oracle-supplied PL/SQL package that contains functions that are specifically crafted to filter, sanitize, and validate Oracle identifiers.
Rather than relying on public synonyms, always specify the SYS schema when you call DBMS_ASSERT.
Other than the two recommended functions stated above, DBMS_ASSERT also contains five more functions. For more details on this topic, see:
Oracle® Database PL/SQL Packages and Types Reference, DBMS_ASSERT