Nowadays, we cannot deny that internet technology has improved the quality of our lives. However, we are facing the threat of online security too. Most security threats are made by attackers using a relatively small number of vulnerabilities.
Computer Viruses
The most common form threat of online security is computer virus. It is a program or fragment of codes that replicates by attaching copies of it or to other programs.
There are four main classes of viruses:
1. File infectors
It’s imbedded themselves into ordinary executable files and attach to other system executables when the file is run.
2. System or boot-record infectors
It’s infecting the first sector on a driver from which the operating system is booted-up. These viruses are not as prevalent now that floppy disks are less frequently used.
3. Macro viruses
It’s infect data files include scripting “macros”.
4. Multi-part viruses
Viruses that use more than one attack is called multi-parts viruses.
Fortunately, in many cases, their predictability makes it easier to prevent attack by following a few simple rules:
1. Apply regular updates and patches as they become available.
2. Employ security software and hardware such as firewalls and authentication servers.
3. Do not use default passwords and other values that are provided with your software.
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