SELECT lv
FROM   ( SELECT LEVEL lv
         FROM   dual
         CONNECT BY LEVEL < 101
       )
ORDER BY dbms_random.value(1,100)
/

declare 
 RN1 number;
 RN2 number;
 RB RAW(16); l number:=16;
begin
 RN1 := DBMS_RANDOM.VALUE;
 dbms_output.put_line('DBMS_RANDOM.VALUE               :'||RN1);

 dbms_crypto_toolkit.Initialize;
 dbms_crypto_toolkit.SEEDRANDOM(null,12345312);

 RN2 := DBMS_CRYPTO_TOOLKIT.RANDOMNUMBER(null);
 dbms_output.put_line('DBMS_CRYPTO_TOOLKIT.RANDOMNUMBER:'||RN2);

 RB := DBMS_CRYPTO_TOOLKIT.RANDOMBYTES(null,l);
 dbms_output.put_line('DBMS_CRYPTO_TOOLKIT.RANDOMBYTES HEX:'||rawtohex(RB));
 RN1 := to_number( rawtohex(RB), rpad('x',l*2,'X'));
 dbms_output.put_line('DBMS_CRYPTO_TOOLKIT.RANDOMBYTES NUM:'||RN1);
end;
/