Cracker
Exploit
Hacker
Hacker Ethics
Hacktvism
Phracker
Phreaker
Script Kiddie


Cracker - One who breaks security on a system. Coined ca. 1985 by hackers in defense against journalistic misuse of hacker (q.v., sense 8). An earlier attempt to establish `worm' in this sense around 1981-82 on Usenet was largely a failure. (Hacker's Jargon File)

Exploit - [originally cracker slang] 1. A vulnerability in software that can be used for breaking security or otherwise attacking an Internet host over the network. The Ping O' Death is a famous exploit. 2. More grammatically, a program that exploits an exploit in sense 1.(Hacker's Jargon File)

Hacker - is anyone who enjoys the intellectual challenge of creatively overcoming or circumventing limitations, primarily in their fields of interest, namely programming or electrical engineering. (Wikipedia)

Unauthorized user who attempts to or gains access to an information system. (NSTISSI 4009)

Hacker ethics - The hackers' "jargon file," compiled collectively on the Net, defines them as people who "program enthusiastically" and who believe that "information-sharing is a powerful positive good, and that it is an ethical duty of hackers to share their expertise by writing free software and facilitating access to information and to computing resources wherever possible." This has been the hacker ethic ever since a group of MIT's passionate programmers started calling themselves hackers in the early sixties. (Pekka Himanen)

Hacktivism -is a policy of hacking, phreaking or creating technology to achieve a political or social goal. (The hacktivist)

Phracker - a person who combines phone phreaking with computer hacking.

Phreaker - Phreaking is a slang term for the action of making a telephone system do something that it normally should not allow. It is an illegal activity (the illegal act being the theft of telephone service), but one formerly pursued by a large number of computer and electronics hobbyists out of curiosity. A phreak or phreaker is a person who engages in the act of manipulating phones in this way. (Wikipedia)

Script Kiddie - A person, normally someone who is not technologically sophisticated, who randomly seeks out a specific weakness over the Internet in order to gain root access to a system without really understanding what it is s/he is exploiting because the weakness was discovered by someone else. (Wikipedia)