The difference between safety and security
Safety is rather protection against accidental events; security is rather protection against intentional damages.
Examples:
1) In the case of a hurricane a place is safe because nothing can happen to you there; in the case of a bank the place is secure because it is protected against unautorizad access.
2) A path can be safe because there is no risk of landslides, etc.; a path in Afghanistan can be secured because there is enough military surveillance protecting you from an ambush
3) Safety First! (this means that you have to make sure no accidents can happen). Security First (this means you have to make sure no ill-intentioned action ca occur.
Security regulations in Australia may be slightly different to the regulations in the countries that you are visiting. Therefore, we recommend you check with your airline or the country you are visiting before you travel. You should arrive at the airport with plenty of time to undergo necessary screening and security checks. You should abide by all instructions, including signs and announcements. You should also consult the travel advice for destinations to which you intend to travel.