Computer security comes in for categories which are internet security, cyber warfare, mobile security, and network security. These computer security categories include the threats of computer crimes, vulnerabilities, eavesdropping, malware, spyware, ransomware, trojans, viruses, worms, rootkits, bootkits, keyloggers, screen scrapers, exploits, backdoors, logic bombs, payloads, denial of service, and web shells.
These computer security systems use these defenses which are computer access control, application security, authentication, authorization, data-centric security, encryption and firewall, intrusion detection system, secure mobile gateway, and runtime application self-protection. A vulnerability in a computer is some form of weakness that has taken place in some part of the computer or computer software process. In the computer security of COMPUSEC, there are four main categories of vulnerabilities. There are also attacks on a computer.