Hackers and Viruses
A hacker is a person who attempts to invade the privacy of a system. A virus is a piece of software that invades programs or data, and which replicates itself and causes harm to data or the IS.
Viruses are written programmers and are usually placed in:
Examples of viruses are:
TROJANS. This is a program that while visibly carrying out one function, secretly carries out another.
WORM. This is a program that replicates itself inside a computer system.
TRAP DOORS. These are undocumented entry points into the system to which malicious code can be attached.
LOGIC BOMBS. These are pieces of code triggered a certain event.
TIME BOMBS. These are pieces of code triggered a certain date.
Protection against viruses includes:
Guarding against introduction of unauthorised software.
Cleaning of disks before downloading.