In is common to distinquish between safety and security, where security related to intentional situations and events (terrorist attacks, burglary, etc) in contract to safety, which covers the accident type of situations and events. It is, however, no problem techically to extend the safety/safe definitions above to also include intentional situations and events, as undesirable events and consequences is also neutral in this respect. Nevertheless, it maybe attractive in some cases to highlight when security issures are addressed in contrast to accicental events, and then use the term "security". (Terje Aven, University of Stavanger):
Security implies a stable, relatively predictable environment in which an individual or group may pursue its ends without disruption or harm and without fear of disturbance or injury. (Fischer, 2004)
Security can be defined as those methods that promote a safe and protected environment so people can pursue their daily activities. (Philip, 2006)