ochrana informací a dat tak, aby je neoprávněné osoby nebo systémy nemohly číst nebo pozměňovat, zatímco oprávněným osobám nebo systémům je přístup povolen

protection of information and data against danger, damage, degradation of quality, loss and criminal activity so that unauthorized persons or systems cannot read or modify them and authorized persons or systems are not denied access to them

NOTE 1 to entry: Security has to be compared to related concepts: Safety, continuity, reliability. The key difference between security and reliability is that security must take into account the actions of people attempting to cause destruction.