Top 10 most notorious and dangerous hackers of all time

People typically conjure up images of “black hat” hackers when they hear the word “hacker.” Black hat hackers hack computers for more nefarious purposes as opposed to white hat hackers, who do so to assist correct security holes. Black hat hackers cause havoc on computer networks and typically leave a trail of victims in their wake, whether they are doing it for financial gain, access to personal information, or just for the joy of it.

In this article, we’ll take a quick look at 10 hackers that have gained notoriety for their high-profile hacking operations against major corporations and even countries. Regardless of their motivations, these hackers keep major corporations on their toes when it comes to the security mechanisms they use in their networks. Some have genuine motives, while others have no qualms about hacking for personal gain read the complete blog to learn about Top 10 most notorious and dangerous hackers of all time .

Top 10 most notorious and dangerous hackers of all time

1. Kevin Mitnick

Given that he is the most well-known computer hacker in the world, Kevin Mitnick would be at the top of the list. The US Department of Justice named him the “most sought cyber criminal in US history.”

Early in life, Mitnick began his hacking career. He originally gained notoriety in 1981 after hacking North American Defense Command (NORAD). Later, these events served as the basis for the film “War Games,” which was created. Mitnick broke into the network infrastructure of Digital Equipment Corporation (DEC) in 1989. He was detained and imprisoned as a result. After the release, he demonstrated his abilities by hacking Pacific Bell’s voicemail system.

2. Adrian Lamo

Adrian Lamo, the 20 years old, altered a Reuters story in 2001 by adding a false quote that was ascribed to former Attorney General John Ashcroft using an unprotected content management system at Yahoo. Lamo frequently breached computer systems before alerting the media and his victims.

He occasionally assisted in the clean-up to increase their security. But as Wired notes, Lamo went too far in 2002 when he hacked The New York Times intranet, listed himself as an expert source, and started researching well-known public people. Because Lamo tended to travel the streets with little more than a bag and frequently had no set location, he acquired the nickname.

3. Anonymous

In an unknown thread on the 4chan message boards, Anonymous first appeared in 2003. The group lacks organisation and has a hazy grasp of the idea of social justice. For instance, the organisation started blocking the Church of Scientology’s websites in 2008 after taking issue with them, which had a bad effect on its Google search results and caused its fax machines to become overrun with all-black images.

A group of “Anons” wearing the now-famous Guy Fawkes mask marched past Scientology temples all over the world in March 2008. Although the FBI and other law enforcement agencies have located some of the group’s more active members, according to The New Yorker, the lack of a true hierarchy makes it nearly impossible to locate or disband Anonymous as a whole.

4. Matthew Bevan and Richard Pryce

In 1996, a group of British hackers led by Matthew Bevan and Richard Pryce broke into a number of military networks, including those at Griffiss Air Force Base, the Defense Information System Agency, and the Korean Atomic Research Institute (KARI). After dumping KARI research onto American military systems, Bevan (Kuji) and Pryce (Datastream Cowboy) have been charged with almost sparking a third world war.

Bevan believes he was seeking evidence to support a UFO conspiracy idea, and the BBC has noted similarities between his case and that of Gary McKinnon. Bevan and Pryce showed that even military networks are susceptible, whether or not there is malicious intent.

5. Jonathan James

Jonathan James, often known as “C0mrade,” is regarded as one of the greatest hackers in history. For amusement, he used to access systems on private networks. In the field of cyber crime, James made history when he was just 15 years old. He stole software by breaking into NASA, the Department of Defense, and Bell South. The system had to be shut down for 21 days as a result of this incident, which cost NASA $41,000.

In 2007, hostile attacks broke into the networks of numerous well-known companies. Despite James’ denial of any involvement, he was accused and investigated. James committed suicide in 2008 because he believed he would be found responsible for crimes he hadn’t committed.

6. Michael Calce

When he was only 15 years old, Michael Calce, also known as “Mafiaboy,” acquired control of university computer networks. The top search engine at the time, Yahoo, was then taken down using the combined resources. He started his now-famous DDoS attack against Dell, eBay, CNN, and Amazon within a week. Corporate America received a shocking notification following this attack and was shocked to see billion-dollar corporations shut down so soon.

Today, Michael advocates cybersecurity pentesting and awareness training as a white hat hacker to safeguard organizations from internet.

7. Kevin Poulsen

Kevin started breaking into the Pentagon’s ARPANET computer network as a youngster. By the end of the decade, in 1988, another hack that Mr. Poulsen committed landed him in legal jeopardy. In order to avoid being discovered, he went underground and persisted in hacking government secrets.

When he famously broke into a radio station in 1990 to win a competition for a brand-new Porsche, a trip, and $20,000 in cash, he made headlines. He has been imprisoned and given a three-year computer access ban since that time. As a journalist and white-hat hacker, Poulsen currently contributes to renowned publications including Wired and The Daily Beast.

8. Jeanson James Ancheta

Jeanson Network disruption for the sake of social justice or computer hacking for the purpose of obtaining credit card information were not James Ancheta’s interests. Ancheta was more intrigued by the use of bots, which are software-based robots that may infiltrate computer systems before ultimately seizing control. By utilising a variety of huge “botnets,” he was able to compromise more than 400,000 devices in 2005.

He allegedly rented out these computers to advertising companies in addition to getting paid to personally install bots or adware on specific systems. According to Ars Technica, this is. Ancheta was sentenced to 57 months in jail. This was the first time a hacker was put behind bars for operating a botnet.


In contrast to the other hackers on this list, this one has never been named in the media. The Daily Mail claims that some information concerning ASTRA has, however, been made public. Specifically, he was identified as a 58-year-old Greek mathematician when he was detained by authorities in 2008.

He allegedly spent close to five years hacking the Dassault Group. He stole state-of-the-art software and data related to weapons technology during that time and sold it to 250 people worldwide. His hacking caused $360 million in losses for the Dassault Group. Nobody is sure why he has never revealed his full identity, although the word “ASTRA” is a Sanskrit word meaning “sword”.

10. Julian Assange

Under the alias “Mendax,” Julian Assange began hacking at the age of 16. Over a four-year period, he obtained access to networks owned by the Pentagon, Citibank, Lockheed Martin, NASA, and Stanford University.

Assange established WikiLeaks in 2006 as a platform for disclosing secret documents and breaking news from unidentified sources. The United States launched an investigation into Assange in 2010 with the intention of bringing charges against him under the 1917 Espionage Act. Despite the British courts rejecting the US’s request for extradition, he is now detained in the UK.

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