4 in the syn flooding attack why do we randomize the source ip address why cannot we 5149339

February 13, 2021/in Business Homework Help Online /by Joseph

4. In the SYN flooding attack, why do we randomize the source IP address? Why cannot we just use the same IP address?

5. Assume that a database only stores the sha256 value for the password and eid columns.The
following SQL statement is sent to the database, where the values of the $passwdand and $eid
variables are provided by users. Does this program have a SQL injection problem.
$sql = “SELECT * FROM employee
WHERE eid=’SHA2($eid, 256)’ and password=’SHA2($passwd, 256)’”;

6. This problem is similar to Question 5 above, except that the hash value is not calculated inside the
SQL statement; it is calculated in the PHP code using PHP’s hash() function. Does this modified
program have a SQL injection problem?
$hashed_eid = hash(’sha256’, $eid);
$hashed_passwd = hash(’sha256’, $passwd);
$sql = “SELECT * FROM employee
WHERE eid=’$hashed_eid’ and password=’$hashed_passwd’”;

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