
Hacking, or penetration testing, is an intriguing profession that is often carried out by highly intelligent professionals. However, the legality of hacking is a complex question that depends on various factors. While the Computer Fraud and Abuse Act (CFAA) and federal hacking laws criminalize unauthorized access to protected computers, the definition of protected computers and the specific circumstances of the hacking activity can blur the lines between legal and illegal hacking. The constitution also plays a role in protecting individuals from unauthorized evidence gathering during investigations, which could impact hacking cases. Ultimately, the fine line between legal and illegal hacking revolves around authorization, intent, and the impact on the target system.
| Characteristics | Values |
|---|---|
| Nature of hacking | Ethical or malicious |
| Authorization | With or without permission |
| Target | Individuals, organizations, or governments |
| Motives | Personal gain, extortion, or disruption |
| Methods | Malware, DDoS attacks, social engineering, physical entry |
| Legal consequences | Felony, misdemeanor, fines, imprisonment |
| Preventative measures | Penetration testing, vulnerability scanning |
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What You'll Learn

Authorization: permission from the target organization is key
The legality of hacking is a complex issue that varies across jurisdictions. However, a key factor in determining whether a hack is illegal is authorization, or permission, from the target organisation or individual.
Hacking without authorization is generally illegal and can result in criminal penalties. This is true even if no harm was intended or caused, as the very act of intrusion can be considered a form of harm. For example, in the US, the Computer Fraud and Abuse Act (CFAA) prohibits unauthorized access to protected computers, and several states have laws prohibiting unauthorized access and computer trespass. Similarly, in the UK, most hacking offenses fall under the Computer Misuse Act 1990, which criminalizes unauthorized access to computer material.
To avoid legal repercussions, hackers should obtain written authorization from the target organization, clearly defining the scope of what they can and cannot do. This authorization is especially important when conducting penetration testing, where ethical hackers are hired to identify vulnerabilities in an organization's systems. By agreeing on the scope and duration of the testing beforehand, penetration testers can legally apply their skills to help organizations strengthen their security.
Additionally, some organizations offer bug bounty programs, where they reward individuals who find and report vulnerabilities in their systems. These programs provide a legal avenue for hackers to utilize their skills and contribute to the improvement of cybersecurity.
In summary, while hacking may serve various purposes, from research and notoriety to malicious intent, authorization from the target organization is a critical factor in determining its legality. Without authorization, hackers risk criminal penalties and civil claims, especially if their actions cause business interruptions or incur investigation and rectification costs.
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Impact: hacking can be illegal even if no harm is caused
The legality of hacking is a complex issue that varies across jurisdictions. However, in most places, hacking without authorization is illegal, even if no harm is caused. This is known as "unauthorized access to computer material" and is considered an offence under laws such as the Computer Misuse Act 1990 in the UK. Similar laws exist in various states in the US, where approximately half of the states have laws that specifically target the use of denial-of-service (DoS) attacks and ransomware.
The key issue is authorization; gaining access to information contained within a computer or system without permission is often considered illegal. This is true even if the hacker believes they are acting in good faith or for ethical reasons. For example, in the US, Aaron Swartz was indicted in 2001 for downloading academic papers from an MIT network, even though the papers were freely available via the JSTOR service, which did not pursue a complaint.
To stay within legal boundaries, hackers must obtain written authorization from the target organization, defining the scope of what they can and cannot do. This is true for both individual hackers and professional penetration testers, who apply their skills to help organizations identify vulnerabilities in their systems. These professionals operate with the full permission of their clients and agree on the scope and duration of the testing beforehand.
While the impact of hacking, or the lack thereof, is an important factor, the primary concern is whether the hacker had permission to access the system. Therefore, hacking can indeed be illegal even if no harm is caused.
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Malicious intent: personal gain, extortion, or data theft
Hacking is a broad term that encompasses various activities, and not all hackers have malicious intentions. Some are driven by intellectual curiosity, the challenge of bypassing system security, or the desire to understand how a device works. These individuals may inadvertently cause harm, but they do not intend to do so.
However, there are indeed hackers with malicious intent, and their actions can have devastating consequences for individuals, organisations, and systems. Malicious hackers are often referred to as ""black hat attackers"" or simply "crackers". They lack ethics, violate laws, and break into computer systems with the intention to cause harm. Their actions may violate the confidentiality, integrity, and availability of organisations' systems and data.
One of the primary motivations for malicious hacking is personal gain or financial benefit. These hackers may be insiders, such as employees, who misuse their privileges to steal and sell confidential information. They may also be outsiders who break into systems to steal sensitive data, such as personal or financial information, which can then be used for identity theft, fraud, or extortion.
Extortion is a serious concern when it comes to malicious hacking. Hackers may gain access to an organisation's or individual's critical data and then demand payment in exchange for not releasing or deleting the information. This type of attack can be devastating for businesses, as it may result in significant financial loss, reputation damage, or even bankruptcy.
Data theft is another significant issue. Malicious hackers may steal sensitive data, such as intellectual property, trade secrets, or customer information, and use it for their own purposes or sell it to competitors. This can result in substantial financial losses, competitive disadvantages, and erosion of trust between organisations and their customers.
To protect against malicious hacking, organisations should conduct proactive penetration testing, vulnerability scanning, and web application scans. They should also encourage bug bounty programs, where ethical hackers are rewarded for finding vulnerabilities, and employ professional penetration testers to check their systems regularly.
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Computer Fraud and Abuse Act (CFAA): a federal crime
The Computer Fraud and Abuse Act (CFAA) is a federal law in the United States that criminalizes accessing a protected computer without authorization or exceeding authorized access. The CFAA was enacted in 1986 as an amendment to the Comprehensive Crime Control Act of 1984 to address growing concerns about computer hacking. The law imposes criminal penalties on individuals who intentionally access a computer, including any connected to the internet, without proper authorization.
The CFAA prohibits hacking into a protected computer and defines a protected computer as any computer connected to the internet or used by the U.S. government or financial institutions. Practically, this means that hacking a protected computer is a federal crime, and federal prosecutors may bring charges against hackers. Depending on the computer hacking charges, the offense may result in a felony or misdemeanor.
The CFAA has been amended several times, most recently in 2008, to broaden its scope and increase penalties. For example, the Identity Theft Enforcement and Restitution Act of 2008 broadened the definition of protected computers to include any computer that affects interstate or foreign commerce or communication. The CFAA also has some overlap with the Stored Communications Act (SCA), which protects stored electronic communications and data.
Despite its importance in addressing hacking, the CFAA has faced criticism for its harsh penalty schemes, ambiguity, and potential for abuse. The law does not define what "without authorization" means, which has led to concerns about its applicability to various computer activities, including journalism and research. Additionally, the CFAA has been scrutinized for its role in the prosecution of internet activist Aaron Swartz, who faced federal charges for allegedly downloading academic articles using MIT's network.
In conclusion, the Computer Fraud and Abuse Act (CFAA) is a federal law that criminalizes unauthorized access to protected computers and has been a crucial tool in addressing hacking and cybercrime. However, the act has also faced criticism for its broad scope and potential for abuse, highlighting the need for ongoing legal reform to adapt to the evolving nature of technology and computer-related crimes.
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Bug Bounty: legal hacking for security vulnerabilities
Whether hacking is illegal or not depends on various factors, including who is being targeted, the intentions of the hacker, whether they have authorisation, and the impact of their actions on the target system. In most jurisdictions, lawmakers and prosecutors try to distinguish between malicious hacking and good-faith security research.
Hacking becomes a crime when an individual accesses someone's device or network without permission. This is referred to as "unauthorised access to computer material" in the Computer Misuse Act 1990, one of the primary pieces of legislation that covers hacking offences. The act of hacking itself is broadly defined as breaking into a computer system.
Bug bounty programs are a form of legal hacking that involves crowdsourced penetration testing. These programs are deals offered by many websites, organisations, and software developers that allow individuals to receive recognition and compensation for reporting bugs, especially those pertaining to security vulnerabilities. If no financial reward is offered, it is called a vulnerability disclosure program. Participants in these programs are called bug bounty hunters, white hats, or ethical hackers. They receive permission to find and report vulnerabilities, thereby helping to prevent cyberattacks.
Many large companies and organisations run their own bug bounty programs, including Microsoft, Facebook, Google, Mozilla, the European Union, and the United States federal government. Facebook, for example, issues custom-branded "White Hat" debit cards to researchers who discover new security bugs. Other companies offer bug bounties through platforms such as HackerOne, which is the largest platform with an estimated 50-70% of submissions being invalid.
While bug bounty programs can provide monetary incentives and help secure systems, they also face criticism. For instance, some programs require researchers to sign non-disclosure agreements, which can be seen as a way for companies to avoid addressing known vulnerabilities. Additionally, the lack of multidisciplinary perspectives in the research on bug bounty programs has been noted, with a need for incorporating insights from fields beyond computer science, such as economics, law, and philosophy.
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Frequently asked questions
No, hacking is not always illegal. Hacking becomes illegal when it involves accessing someone's device or network without permission. This is also referred to as "unauthorised access".
"Unauthorised access" occurs when an individual accesses, touches, manipulates, interfaces with, or obstructs/prevents the operation of a computer or information system without explicit permission.
The consequences of hacking can vary depending on the jurisdiction and the severity of the offence. In some cases, hacking may result in fines, jail time, or both. For minor offences, a first offence may result in a year or less in jail. More serious offences can lead to between 5 and 10 years in prison, and up to 20 years if there are prior convictions.
Yes, there are legal forms of hacking such as ethical hacking or penetration testing. In these cases, the hacker has the appropriate consent or authorisation to hack into a system, often with permission from a law enforcement agency or a court order.
Illegal hacking includes hacking for fun, for political purposes, or as part of organised crime. Hacking against a company or individual without permission is considered an offence under the Computer Misuse Act 1990 and other relevant legislation.

























