Security is the property of defending capability against any attack on an asset.
Fundemental properties of security:
There are three fundamental properties of security 1. Confidentiality. 2. Integrity. 3. Authenticity.
A system is CIA secured if it can pass the three properties below:
Confidentiality: The attacker can not read the information.
Integrity: Even if the attacker read the information but the attacker can not change a bit of the information.
Authenticity : Even if the the attacker can read and be able to change a bit of the information but the attacker can not authenticate himself/herself to the system.