White hat (computer security)
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The term "white hat" in Internet slang refers to an ethical computer hacker, or a computer security expert, who specializes in penetration testing and in other testing methodologies to ensure the security of an organization's information systems. Ethical hacking is a term meant to imply a broader category than just penetration testing. Contrasted with black hat, a malicious hacker, the name comes from Western films, where heroic and antagonistic cowboys might traditionally wear a white and a black hat respectively.
One of the first instances of an ethical hack being used was a "security evaluation" conducted by the United States Air Force, in which the Multics operating systems was tested for "potential use as a two-level (secret/top secret) system." The evaluation determined that while Multics was "significantly better than other conventional systems," it also had "... vulnerabilities in hardware security, software security and procedural security" that could be uncovered with "a relatively low level of effort." The authors performed their tests under a guideline of realism, so their results would accurately represent the kinds of access an intruder could potentially achieve. They performed tests involving simple information-gathering exercises, as well as outright attacks upon the system that might damage its integrity; both results were of interest to the target audience. There are several other now unclassified reports describing ethical hacking activities within the US military.
By 1981 The New York Times described white hat activities as part of a "mischievous but perversely positive 'hacker' tradition". When a National CSS employee revealed the existence of his password cracker, which he had used on customer accounts, the company chastised him not for writing the software but for not disclosing it sooner. The letter of reprimand stated "The Company realizes the benefit to NCSS and in fact encourages the efforts of employees to identify security weaknesses to the VP, the directory, and other sensitive software in files".
The idea to bring this tactic of ethical hacking to assess security of systems was formulated by Dan Farmer and Wietse Venema. With the goal of raising the overall level of security on the Internet and intranets, they proceeded to describe how they were able to gather enough information about their targets to have been able to compromise security if they had chosen to do so. They provided several specific examples of how this information could be gathered and exploited to gain control of the target, and how such an attack could be prevented. They gathered up all the tools they had used during their work, packaged them in a single, easy-to-use application, and gave it away to anyone who chose to download it. Their program, called Security Administrator Tool for Analyzing Networks, or SATAN, was met with a great amount of media attention around the world in 1992.
While penetration testing concentrates on attacking software and computer systems from the start – scanning ports, examining known defects and patch installations, for example – ethical hacking may include other things. A full blown ethical hack might include emailing staff to ask for password details, rummaging through executive’s dustbins and usually breaking and entering, without the knowledge and consent of the targets. Only the owners, CEOs and Board Members (stake holders) who asked for such a security review of this magnitude are aware. To try to replicate some of the destructive techniques a real attack might employ, ethical hackers may arrange for cloned test systems, or organize a hack late at night while systems are less critical. In most recent cases these hacks perpetuate for the long term con (days, if not weeks, of long term human infiltration into an organization). Some examples include leaving USB/flash key drives with hidden auto-start software in a public area, as if someone lost the small drive and an unsuspecting employee found it and took it.
Some other methods of carrying out these include:
- DoS attacks
- Social engineering tactics
- Reverse engineering 
- Network security 
- Disk and memory forensics 
- Vulnerability research 
- Security scanners such as:
- Frameworks such as:
- Training Platforms
Such methods identify and exploit known vulnerabilities, and attempt to evade security to gain entry into secured areas. They are able to do this by hiding software and system 'back-doors' that could be used as a link to the information or access the non-ethical hacker, also known as 'black-hat' or 'grey-hat', may want to reach.
Legality in the UK
Struan Robertson, legal director at Pinsent Masons LLP, and editor of OUT-LAW.com, says "Broadly speaking, if the access to a system is authorized, the hacking is ethical and legal. If it isn't, there's an offence under the Computer Misuse Act. The unauthorized access offence covers everything from guessing the password, to accessing someone's webmail account, to cracking the security of a bank. The maximum penalty for unauthorized access to a computer is two years in prison and a fine. There are higher penalties – up to 10 years in prison – when the hacker also modifies data". Unauthorized access even to expose vulnerabilities for the benefit of many is not legal, says Robertson. "There's no defense in our hacking laws that your behavior is for the greater good. Even if it's what you believe."
The examples and perspective in this article deal primarily with the English-speaking world and do not represent a worldwide view of the subject. (June 2011) (Learn how and when to remove this template message)
The United States National Security Agency offers certifications such as the CNSS 4011. Such a certification covers orderly, ethical hacking techniques and team-management. Aggressor teams are called "red" teams. Defender teams are called "blue" teams. When the agency recruited at DEF CON in 2012, it promised applicants that "If you have a few, shall we say, indiscretions in your past, don't be alarmed. You shouldn't automatically assume you won't be hired".
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