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Hacker is a term used to describe different types of computer experts. The meaning of the term, when used in a computer context, has changed somewhat over the decades since it first came into use, as it has been given additional and clashing meanings by new users of the word.
Currently, "hacker" is used in two main ways, one complimentary and one negative. It can be used in the computing community to describe a particularly brilliant programmer or technical expert (for example: "Linus Torvalds, the creator of Linux, is a genius hacker."). In popular usage and in the media, however, it generally describes computer intruders or criminals.
A possible middle ground position observes that "hacking" describes a collection of skills, and that these skills are utilized by hackers of both descriptions, though for differing reasons. The companion situation which illustrates this is the skills involved in locksmithing, specifically picking locks, which is a skill which can be used for good or evil.
A: Pronounced “leet speak”, from “elite”. A system of spellings of English words or phrases using numbers and symbols to replace common letters and featuring deliberate misspellings. Supposedly the “language of hackers”, in reality it’s used more seriously by the “script kiddie” crowd, although it is commonly used jokingly by experienced Internet users.
Formed by combining “hack” with “activism,” hacktivism is the act of hacking into a Web site or computer system in order to communicate a politically or socially motivated message.
Unlike a malicious hacker, who may disrupt a system for financial gain or out of a desire to cause harm, the hacktivist performs the same kinds of disruptive actions (such as a DoS attack) in order to draw attention to a cause.
For the hacktivist, it is an Internet-enabled way to practice civil disobedience and protest.
"Grey Hat" is the term often given to hackers whose actions are not malicious but whose hacking methods may cross legal or ethical lines. It's also used to categorize hackers who may at one stage have broken the law in their hacking activities, but who have since come across to the more ethical white side.
“Gray Hat” describes a cracker who exploits a security weakness in a computer system or product in order to bring the weakness to the attention of the owners. Unlike a black hat, a gray hat acts without malicious intent. The goal of a gray hat is to improve system and network security.
However, by publicizing a vulnerability, the gray hat may give other crackers the opportunity to exploit it. This differs from the white hat who alerts system owners and vendors of a vulnerability without actually exploiting it in public.
“Grey Hat” Hackers don’t commit crimes but may give information to Black Hat Hackers who will.
A: Many times, white hats say that when they notify a company privately of a security flaw, the company ignores them or attempts to silence them. By posting the flaw publicly, the company is forced to take action to correct the flaw, lest it leave a known security hole in place.
In computing, a script kiddie (occasionally script bunny, script kitty or skiddie) is a derogatory term for inexperienced crackers who use scripts and programs developed by others, without knowing what they are or how they work, for the purpose of compromising computer accounts and files, and for launching attacks on whole computer systems (see DoS).
In general, they do not have the ability to write these kinds of programs on their own. Such programs have included WinNuke applications, Back Orifice, and Sub7.Script kiddies, instead of attacking an individual system, often scan thousands of computers looking for vulnerable targets before initiating an attack. This is similar to wardialing and wardriving in which the attacker isn't looking at one specific system, but instead anything that is open and looks interesting. The term is also often used as a derogatory moniker for individuals who do not contribute to the development of new security-related programs, especially exploits, but rather benefit from the work of others.
The term system administrator, abbreviated sysadmin, designates an employment position of those people responsible for running technically enchanced information systems or some aspect of them. They often deal with the setup and maintenance of computers and networks.
System Administators also work on more than just computers, such as the interaction between humans and technology, and the enhancement of business process's through technology.