Hacking

1. Definition: an illegal access to data in a computer system or a network

2. hacker

2.1. White hat crackers

2.1.1. learn more about how systems and networks work

2.1.2. help to discover and fix security holes

2.2. Black hat crackers

2.2.1. author harmful software (like viruses, trojans, etc.)

2.2.2. illegally infiltrate secure systems

3. Usual hacking method

3.1. D.O.S attack (denial of service attack)

3.1.1. make a network or machine resources unavailable to to make a sever down by overloading it

3.2. Sniffer

3.2.1. originally designed for network engineers to diagnose network problems

3.2.2. hackers use it to capture network information and sensitive personal data from the network