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What is a hacker in computing?
In computing, a hacker is an IT enthusiast who compromises computer security. Hacking dates back to the 1950s with phone phreaks, who hijacked phone networks, and grew into a subculture by the 1970s.
Hackers are often associated with cybercrime, but the computer programming community categorizes them by legality:
* White hats Hack for companies or governments legally.
* Gray hats Enter systems without permission but mean no harm, often reporting vulnerabilities.
* Black hats Illegally break into systems with malicious intent, like stealing data. Some black hats are hacktivists, who hack for what they believe to be the common good.4 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
What do hackers do with computers?
Hackers, who may be information technology experts or enthusiasts, use computers to compromise the security of computer systems. Depending on their intentions, hackers may be categorized as white hats, who engage in legal hacking; gray hats, who enter systems without permission but mean no harm; and black hats, who break into systems with malicious intent.
Cyberattacks can target a systemâs syntactic layer using malware or semantic layer, attempting to trick victims into providing valuable information through social engineering, such as in phishing attacks.
4 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
What is the difference between a white-hat hacker and a black-hat hacker?
A hacker is an IT enthusiast who can compromise computer security. The computer programming community distinguishes between white hat and black hat hackers based on their motivations and actions.
White-hat hackers White-hat hackers test computer systems to identify vulnerabilities that can be fixed. They engage in legal hacking for companies or governments.
Black-hat hackers Black-hat hackers infiltrate computer systems with malicious intent, such as stealing sensitive data or disabling websites.
3 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
How do hackers find weaknesses in computer systems?
Hackers find weaknesses in computer systems through both targeted and untargeted cyberattacks. In untargeted attacks, hackers may use scanning to systematically find vulnerabilities, aiming for entry points into a system. Another approach involves water holing, where hackers compromise a web page and attack visitors to that page.
In targeted attacks, hackers may use phishing scams to steal data or install malware. They might also use cross-site scripting to infect a website, or they might hijack a third-party vendor to infiltrate a system. Account compromise is another method, where attackers hijack a legitimate userâs access, often using passwords obtained through phishing or purchased on the dark web.
1 Britannica SourceCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
How can individuals and companies protect themselves from hackers?
To protect against hackers, individuals and companies should keep software up to date and avoid unknown links. Identity and access management strategies like multifactor authentication and strong passwords add security. Using biometrics with passwords provides an extra layer of security.
Firewalls and internet encryption can prevent unauthorized network interactions, while data loss prevention tools monitor threats and back up important data. Employee cybersecurity education, third-party security experts, and internal cybersecurity teams can deter attacks by finding weaknesses and creating response plans. Sharing scam stories can also be a powerful deterrent.
4 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
hacker, information technology professionals or enthusiasts who compromise (or âhackâ) the security of computers.
While hackers are strongly associated with criminality in popular culture, the computer programming community generally groups them into three categories of legality: altruistic âwhite hats,â who engage in legal hacking for companies or governments; âgray hats,â who enter computer systems without permission but mean no harm, often reporting any vulnerabilities they find to the companies involved (sometimes for a fee); and âblack hats,â who break into systems with malicious intentâe.g., to steal sensitive data. These labels are sometimes used as moral descriptorsâ white hats, for example, are often referred to as âthe good guysââbut this is an oversimplification. After all, hackers employed by an oppressive government to persecute its enemies are nevertheless white hats by definition, while black-hat activists like Anonymous often hack for what they believe to be the common good.
The origins of hacking
The first recorded use of the word hack to mean interacting with a machine was in 1955 during a meeting of the Tech Model Railroad Club at the Massachusetts Institute of Technology (MIT); students were urged to turn the power off before âhacking on the electrical system,â a request that suggests hacking was originally understood to be a benign action.
The first computer hackers were MIT students during the 1950s and â60s. The word hack in this case was slang for a shortcutâsomething for which computer-science students at MIT were always searching. Computers were expensive to run, so a programming shortcut saved time and money. As finding such shortcuts became a badge of pride, the students capable of finding them began calling themselves hackers, and hacking became a kind of sport among them.
For some of these students, the question of whether a particular hack would be authorized by the schoolâor even be legalâwas not a barrier. Indeed, the first recorded use of the word hacker in print appeared in a 1963 article in MITâs The Tech detailing how hackers managed to illegally access the universityâs telephone network. Notably, one of the hackersâ schemes involved a PDP-1 computer, making the article also the first known reference to black-hat use of digital devices.
The development of hacker subculture and hacktivism
The new hacker subculture developed and grew beyond the confines of the MIT campus. In 1984 the first issue of 2600: The Hacker Quarterly, nicknamed âthe hackerâs bible,â was published. 2600: The Hacker Quarterly served as both a technical journal, focusing on technological exploration and know-how, and a muckraking magazine, exposing government and corporate misdeeds. 2600: The Hacker Quarterly has been continually involved in the legal, ethical, and technical debates over hacking.
The U.S. government became concerned enough about hacking to pass the Comprehensive Crime Control Act in 1984 and the Computer Fraud and Abuse Act in 1986. Some of the impetus for the passage of these laws was literally fictional: a highly successful movie named WarGames came out in 1983, worrying the world with its suggestion that hackers could cause World War III. But other hacks were very real. In 1981 a seventeen-year-old, Kevin Mitnick, allegedly broke into the North American Aerospace Defense (NORAD) system. In 1986 a German named Markus Hess became the first known hacker to engage in foreign espionage, cracking the U.S. militaryâs network on behalf of the Soviet Union.
The year 2008 saw a new motivation for hacking: social activism. An informal group of hackers who called themselves Anonymous initiated Project: Chanology, a campaign of harassment against the Church of Scientology. Inspired by the global popularity of their actions, Anonymous and other like-minded hackers (âhacktivistsâ) went on to hack for causes as diverse as WikiLeaks, Occupy Wall Street, and the sovereignty of Taiwan.
The following decade revealed that hacking for political purposes was already normal at the government level. In June 2010 it was discovered that the U.S. government had introduced a worm (a type of malicious computer program) called Stuxnet into the computer networks of several countries. In 2013 the Russian Federal Security Service (FSB) hacked Yahoo! to gain access to the companyâs user data. In 2018 North Korean hackers dealt a blow to Sony as punishment for its production of a movie that showed Kim Jong-Un in a negative light.
Today, hacking is more common than ever on both sides of the legal line. In fact, the wider adoption of remote work as a response to the COVID-19 pandemic might have caused a commensurate increase in remote network intrusion; there were 50 percent more attacks in 2021 than in 2020. To combat this ever-rising tide of cybercrime, roughly one million cybersecurity specialists were employed in the United States alone in 2022âwith another 750,000 positions unfilled.

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