Hacker (computer and network security)

A hacker is someone who breaks into computers, specially networks (not limited to the Internet).

It is a community of people who had a large interest in computer programming, often sharing, without restrictions, the source code for the software they wrote. Criminal hackers are called "crackers" (criminal hacker) by the hacking community, but this term is not widely used.[1]

Note that the term hacker is actually wrong; originally it referred to a programmer who explored program code in order to enhance it, while the term cracker was exclusively used about persons breaking into computers. Nowadays however, people usually refer to inbreakers as hackers.

In common usage, a hacker is a person who breaks into computers and computer networks, either for profit or motivated by the challenge.[2] The subculture that has evolved around hackers is often referred to as the computer underground but is now an open community.[3]

Contents [hide]
1 History
2 Artifacts and customs
2.1 Hacker groups and conventions
3 Hacker attitudes
4 Attacks
4.1 Security exploits
4.2 Techniques
5 Notable intruders and criminal hackers
6 Notable security hackers
7 Hacking and the media
7.1 Hacker magazines
7.2 Hackers in fiction
7.3 Non-fiction books
7.4 Fiction books
8 See also
9 References
10 Related literature
11 External links

***



History

In today's society understanding the term Hacker is complicated because it has many different definitions. The term Hacker can be traced back to MIT (Massachusetts Institute Technology). MIT was the first institution to offer a course in computer programming and computer science and it is here in 1960 where a group of MIT students taking a lab on Artificial Intelligence first coined this word. These students called themselves hackers because they were able to take programs and have them perform actions not intended for that program. “The term was developed on the basis of a practical joke and feeling of excitement because the team member would “hack away” at the keyboard hours at a time.” (Moore R., 2006).[4]

Hacking developed alongside phone phreaking, a term referred to exploration of the phone network without authorization, and there has often been overlap between both technology and participants.[citation needed] The first recorded[citation needed] hack was accomplished by Joe Engressia also known as The Whistler. Engressia is known as the grandfather of phreaking. His hacking technique was that he could perfectly whistle a tone into a phone and make free call.[5] Bruce Sterling traces part of the roots of the computer underground to the Yippies, a 1960s counterculture movement which published the Technological Assistance Program (TAP) newsletter. .[6] Other sources of early 70s hacker culture can be traced towards more beneficial forms of hacking, including MIT labs or the homebrew club, which later resulted in such things as early personal computers or the open source movement.



Artifacts and customs

The computer underground[2] is heavily dependent on technology. It has produced its own slang and various forms of unusual alphabet use, for example 1337speak. Writing programs and performing other activities to support these views is referred to as hacktivism. Some go as far as seeing illegal cracking ethically justified for this goal; a common form is website defacement. The computer underground is frequently compared to the Wild West.[7] It is common among hackers to use aliases for the purpose of concealing identity, rather than revealing their real names




Hacker groups and conventions

The computer underground is supported by regular real-world gatherings called hacker conventions or "hacker cons". These drawn many people every year including SummerCon (Summer), DEF CON, HoHoCon (Christmas), ShmooCon (February), BlackHat, Hacker Halted, and H.O.P.E..[citation needed]. In the early 1980s Hacker Groups became popular, Hacker groups provided access to information and resources, and a place to learn from other members. Hackers could also gain credibility by being affiliated with an elite group.[8]



Hacker attitudes

Several subgroups of the computer underground with different attitudes and aims use different terms to demarcate themselves from each other, or try to exclude some specific group with which they do not agree. Eric S. Raymond (author of The New Hacker's Dictionary) advocates that members of the computer underground should be called crackers. Yet, those people see themselves as hackers and even try to include the views of Raymond in what they see as one wider hacker culture, a view harshly rejected by Raymond himself. Instead of a hacker/cracker dichotomy, they give more emphasis to a spectrum of different categories, such as white hat, grey hat, black hat and script kiddie. In contrast to Raymond, they usually reserve the term cracker. According to (Clifford R.D. 2006) a cracker or cracking is to "gain unauthorized access to a computer in order to commit another crime such as destroying information contained in that system".[9] These subgroups may also defined by the legal status of their activities.[10]

White hat
A white hat hacker breaks security for non-malicious reasons, for instance testing their own security system. This classification also includes individuals who perform penetration tests and vulnerability assessments within a contractual agreement. Often, this type of 'white hat' hacker is called an ethical hacker. The International Council of Electronic Commerce Consultants, also known as the EC-Council has developed certifications, courseware, classes, and online training covering the diverse arena of Ethical Hacking.[10]

Black hat
A black hat hacker, sometimes called a cracker, is someone who breaks computer security without authorization or uses technology (usually a computer, phone system or network) for malicious reasons such as vandalism, credit card fraud, identity theft, piracy, or other types of illegal activity.[10][11]

Grey hat
A grey hat hacker is a combination of a Black Hat and a White Hat Hacker. A Grey Hat Hacker may surf the internet and hack into a computer system for the sole purpose of notifying the administrator that their system has been hacked, for example. Then they may offer to repair their system for a small fee.[4]

Elite hacker
A social status among hackers, elite is used to describe the most skilled. Newly discovered exploits will circulate among these hackers. Elite groups such as Masters of Deception conferred a kind of credibility on their members.[12]:86,90,117 Elite (e.g. 31337) gives the term leet speak its name.

Script kiddie
A script kiddie is a non-expert who breaks into computer systems by using pre-packaged automated tools written by others, usually with little understanding of the underlying concept—hence the term script (i.e. a prearranged plan or set of activities) kiddie (i.e. kid, child—an individual lacking knowledge and experience, immature).[11]

Neophyte
A neophyte, "n00b", or "newbie" is someone who is new to hacking or phreaking and has almost no knowledge or experience of the workings of technology, and hacking.[4]

Blue hat
A blue hat hacker is someone outside computer security consulting firms who is used to bug test a system prior to its launch, looking for exploits so they can be closed. Microsoft also uses the term BlueHat to represent a series of security briefing events.[13][14][15]

Hactivist
A hacktivist is a hacker who utilizes technology to announce a social, ideological, religious, or political message. In general, most hacktivism involves website defacement or denial-of-service attacks. In more extreme cases, hacktivism is used as tool for cyberterrorism.



Attacks

A typical approach in an attack on Internet-connected system is:
Network enumeration: Discovering information about the intended target.
Vulnerability analysis: Identifying potential ways of attack.
Exploitation: Attempting to compromise the system by employing the vulnerabilities found through the vulnerability analysis.[16]

In order to do so, there are several recurring tools of the trade and techniques used by computer criminals and security experts.



Security exploits

A security exploit is a prepared application that takes advantage of a known weakness. Common examples of security exploits are SQL injection, Cross Site Scripting and Cross Site Request Forgery which abuse security holes that may result from substandard programming practice. Other exploits would be able to be used through FTP, HTTP, PHP, SSH, Telnet and some web-pages. These are very common in website/domain hacking.



Techniques

Vulnerability scanner
A vulnerability scanner is a tool used to quickly check computers on a network for known weaknesses. Hackers also commonly use port scanners. These check to see which ports on a specified computer are "open" or available to access the computer, and sometimes will detect what program or service is listening on that port, and its version number. (Note that firewalls defend computers from intruders by limiting access to ports/machines both inbound and outbound, but can still be circumvented.)
Password cracking
Password cracking is the process of recovering passwords from data that has been stored in or transmitted by a computer system. A common approach is to repeatedly try guesses for the password.
Packet sniffer
A packet sniffer is an application that captures data packets, which can be used to capture passwords and other data in transit over the network.
Spoofing attack
A spoofing attack involves one program, system, or website successfully masquerading as another by falsifying data and thereby being treated as a trusted system by a user or another program. The purpose of this is usually to fool programs, systems, or users into revealing confidential information, such as user names and passwords, to the attacker.
Rootkit
A rootkit is designed to conceal the compromise of a computer's security, and can represent any of a set of programs which work to subvert control of an operating system from its legitimate operators. Usually, a rootkit will obscure its installation and attempt to prevent its removal through a subversion of standard system security. Rootkits may include replacements for system binaries so that it becomes impossible for the legitimate user to detect the presence of the intruder on the system by looking at process tables.
Social engineering
Social engineering is the art of getting persons to reveal sensitive information about a system. This is usually done by impersonating someone or by convincing people to believe you have permissions to obtain such information.
Trojan horses
A Trojan horse is a program which seems to be doing one thing, but is actually doing another. A trojan horse can be used to set up a back door in a computer system such that the intruder can gain access later. (The name refers to the horse from the Trojan War, with conceptually similar function of deceiving defenders into bringing an intruder inside.)
Viruses
A virus is a self-replicating program that spreads by inserting copies of itself into other executable code or documents. Therefore, a computer virus behaves in a way similar to a biological virus, which spreads by inserting itself into living cells.
While some are harmless or mere hoaxes most computer viruses are considered malicious.
Worms
Like a virus, a worm is also a self-replicating program. A worm differs from a virus in that it propagates through computer networks without user intervention. Unlike a virus, it does not need to attach itself to an existing program. Many people conflate the terms "virus" and "worm", using them both to describe any self-propagating program.
Key loggers
A key logger is a tool designed to record ('log') every keystroke on an affected machine for later retrieval. Its purpose is usually to allow the user of this tool to gain access to confidential information typed on the affected machine, such as a user's password or other private data. Some key loggers uses virus-, trojan-, and rootkit-like methods to remain active and hidden. However, some key loggers are used in legitimate ways and sometimes to even enhance computer security. As an example, a business might have a key logger on a computer used at a Point of Sale and data collected by the key logger could be used for catching employee fraud




LIst Of Notable intruders and criminal hackers
******check the page "Notable intruders and criminal hackers" for the list of convicted hackers******



Notable security hackers

check the page "Main article: List of hackers" for more

Kevin Mitnick is a computer security consultant and author, formerly the most wanted computer criminal in United States history.[17]
Eric Corley (also known as Emmanuel Goldstein) is the long standing publisher of 2600: The Hacker Quarterly. He is also the founder of the H.O.P.E. conferences. He has been part of the hacker community since the late '70s.
Gordon Lyon, known by the handle Fyodor, authored the Nmap Security Scanner as well as many network security books and web sites. He is a founding member of the Honeynet Project and Vice President of Computer Professionals for Social Responsibility.
Solar Designer is the pseudonym of the founder of the Openwall Project.
Michał Zalewski (lcamtuf) is a prominent security researcher.
Gary McKinnon is a British hacker facing extradition to the United States to face charges of perpetrating what has been described as the "biggest military computer hack of all time".[18]




Hacker magazines

The most notable hacker-oriented magazine publications are Phrack, Hakin9 and 2600: The Hacker Quarterly. While the information contained in hacker magazines and ezines was often outdated, they improved the reputations of those who contributed by documenting their successes.[8]