Hacker: The people who use and create computer software to gain access to information illegally are termed as hackers.
Expert Hacker: The hacker who develops software scripts and codes to exploit the organisation's information asset is termed as ethical hacker.
Ethical Hacker: A person who hacks into a computer network in order to test or evaluate its security, rather than with malicious or criminal intent.
Cracker: An individual who "cracks" or removes the protective mechanism that is designed to prevent unauthorized duplication.
Phreaker: An individual who hacks the public telephone network and gains information from the communication.
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