Protection and security Protection and security require that computer resources such as CPU, software, memory, etc. are protected. This extends to the operating system as well as the data in the system. This can be done by ensuring integrity, confidentiality, and availability in the operating system. The system must be protected against unauthorized access, viruses, worms, etc. Basic definitions Threats It contains viruses, worms, trojan horses, and other dangerous software. These are generally short code snippets that may corrupt files, delete the data, replicate to propagate further, and even crash a system. Virus Viruses are generally small snippets of code embedded in a system. They are very dangerous and can corrupt files, destroy data, crash systems, etc. They can also spread further by replicating themselves as required. Trojan Horse A trojan horse can secretly access the login details of a system. Then a malicious user can use these to enter the s...
