wat is MSEC ? in mageia 2 ?

recently i just updated my repos n got notifications MSEC has performd diff chek on localhost domain on mar 00:00:00 .changes in system securirty detected n available in /var/log/security log ,,,,,,,,,,,////// .................
so wat it means n how abot security in mageia 2 n firewall configurations n how will i come to know tat nothing is tracked down............
so wat it means n how abot security in mageia 2 n firewall configurations n how will i come to know tat nothing is tracked down............