security control
safeguard or countermeasure to avoid, detect, counteract, or minimize security risks to physical property, information, computer systems, or other assets
access control
selective restriction of access to a place or other resource, allowing only authorized users
perimeter security
natural barriers or built fortifications to either keep intruders out or to keep captives contained within the area the boundary surrounds
countermeasure
security action, device, procedure, or technique that reduces a threat, a vulnerability, or an attack by elimination or prevention, by minimizing its harm, or by discovering and reporting it so that corrective action can be taken
defense in depth
in information security, the placing of multiple layers of security controls throughout an IT system to provide redundancy in the event a security control fails
authentication
act of confirming the truth of an attribute of a datum or entity, often used as part of access control
authorization
function of specifying access rights and privileges to resources, which is related to information security and computer security in general and to access control in particular