Authentication (from Greek "αυθεντικός;" real or genuine, from "authentes;" author) is the act of establishing or confirming something (or someone) as "authentic", that is, that claims made by or about the thing are true. This might involve confirming the identity of a person, the origins of an artifact, or assuring that a computer program is a trusted one.

Authentication methods

In art, antiques, and anthropology, a common problem is verifying that a given artifact was produced by a certain famous person, or was produced in a certain place or period of history.

There are two types of techniques for doing this.

The first is comparing the attributes of the object itself to what is known about objects of that origin. For example, an art expert might look for similarities in the style of painting, check the location and form of a signature, or compare the object to an old photograph. An archaeologist might use carbon dating to verify the age of an artifact, do a chemical analysis of the materials used, or compare the style of construction or decoration to other artifacts of similar origin. The physics of sound and light, and comparison with a known physical environment, can be used to examine the authenticity of audio recordings, photographs, or videos.

Attribute comparison may be vulnerable to forgery. In general, it relies on the fact that creating a forgery indistinguishable from a genuine artifact requires expert knowledge, that mistakes are easily made, or that the amount of effort required to do so is considerably greater than the amount of money that can be gained by selling the forgery.

Criminal and civil penalties for fraud, forgery, and counterfeiting can reduce the incentive for falsification, depending on the risk of getting caught.

The second type relies on documentation or other external affirmations. For example, the rules of evidence in criminal courts often require establishing the chain of custody of evidence presented. This can be accomplished through a written evidence log, or by testimony from the police detectives and forensics staff that handled it. Some antiques are accompanied by certificates attesting to their authenticity. External records have their own problems of forgery and perjury, and are also vulnerable to being separated from the artifact and lost.

Currency and other financial instruments commonly use the first type of authentication method. Bills, coins, and cheques incorporate hard-to-duplicate physical features, such as fine printing or engraving, distinctive feel, watermarks, and holographic imagery, which are easy for receivers to verify.

Consumer goods such as pharmaceuticals, perfume, fashion clothing can use either type of authentication method to prevent counterfeit goods from taking advantage of a popular brand's reputation (damaging the brand owner's sales and reputation). A trademark is a legally protected marking or other identifying feature which aids consumers in the identification of genuine brand-name goods.

Information content

The authentication of information can pose special problems, and is often wrapped up with authenticating identity.

Literary forgery can involve imitating the style of a famous author. If an original manuscript, typewritten text, or recording is available, then the medium itself (or its packaging - anything from a box to e-mail headers) can help prove or disprove the authenticity of the document.

However, text, audio, and video can be copied into new media, possibly leaving only the informational content itself to use in authentication.

Various systems have been invented to allow authors to provide a means for readers to reliably authenticate that a given message originated from or was relayed by them. These involve authentication factors like:

* A difficult-to-reproduce physical artifact, such as a seal, signature, watermark, special stationery, or fingerprint.
* A shared secret, such as a passphrase, in the content of the message.
* An electronic signature; public key infrastructure is often used to cryptographically guarantee that a message has been signed by the holder of a particular private key.

The opposite problem is detection of plagiarism, where information from a different author is passed of as a person's own work. A common technique for proving plagiarism is the discovery of another copy of the same or very similar text, which has different attribution. In some cases excessively high quality or a style mismatch may raise suspicion of plagiarism.

Factual verification

Determining the truth or factual accuracy of information in a message is generally considered a separate problem from authentication. A wide range of techniques, from detective work to fact checking in journalism, to scientific experiment might be employed.

Authentication factors and identity

An authentication factor is a piece of information used to authenticate or verify a person's identity for security purposes.

Human authentication factors are generally classified into three cases:
*Something the user has (e.g., identity document or card, security token, software token, phone, or cell phone)
*Something the user knows (e.g., a password, pass phrase, or personal identification number (PIN))
*Something the user is or does (e.g., fingerprint or retinal pattern, DNA sequence (there are assorted definitions of what is sufficient), signature or voice recognition, unique bio-electric signals, or another biometric identifier)

Other authentication factors include:
* Social networking [ [ Paper from RSA laboratories] ] or
* A "web of trust" forming relationships between authentication credentials
* "Location-based authentication", such as that employed by credit card companies to ensure a card is not being used in two places at once.
* "Time-based authentication", such as only allowing access during normal working hours.

Two-factor authentication

Often a combination of methods is used, e.g., a bankcard and a PIN, in which case the term "two-factor authentication" is used. Business networks may require users to provide a password and a random number from a security token.

Historically, fingerprints have been used as the most authoritative method of authentication, but recent court cases in the US and elsewhere have raised fundamental doubts about fingerprint reliability. Other biometric methods are promising (retinal and fingerprint scans are an example), but have shown themselves to be easily spoofable in practice. Hybrid or two-tiered authentication methods offer a compelling solution, such as private keys encrypted by fingerprint inside of a USB device.

In a computer data context, cryptographic methods have been developed ("see" digital signature and challenge-response authentication) which are currently not spoofable if and only if the originator's key has not been compromised. That the originator (or anyone other than an attacker) knows (or doesn't know) about a compromise is irrelevant. It is not known whether these cryptographically based authentication methods are provably secure since unanticipated mathematical developments may make them vulnerable to attack in future. If that were to occur, it may call into question much of the authentication in the past. In particular, a digitally signed contract may be questioned when a new attack on the cryptography underlying the signature is discovered.

trong authentication

The U.S. Government's National Information Assurance Glossary defines strong authentication as

:"layered authentication approach relying on two or more authenticators to establish the identity of an originator or receiver of information."

Authentication vs. authorization

To distinguish "authentication" from the closely related term "authorization," the short-hand notations A1 (authentication) and A2 (authorization) are occasionally used.The terms AuthN / AuthZ or Au / Az are also used to make this distinction in some communities.

The problem of authorization is often thought to be identical to that of authentication; many widely adopted standard security protocols, obligatory regulations, and even statutes are based on this assumption. However, more precise usage describes authentication as the process of verifying a claim made by a person (or a computer, smart card etc.), while authorization is the process of verifying that an authenticated person has the authority to perform a certain operation. Authentication, therefore, must precede authorization. For example, when you show proper identification to a bank teller, you could be authenticated by the teller, and you would be authorized to access information about your bank accounts. You would not be authorized to access accounts that are not your own.

Since authorization cannot occur without authentication, the former term is sometimes used to mean the combination of authentication and authorization.

Access control

One familiar use of authentication and authorization is access control. A computer system supposed to be used only by those authorized must attempt to detect and exclude the unauthorized. Access to it is therefore usually controlled by insisting on an authentication procedure to establish with some established degree of confidence the identity of the user, thence granting those privileges as may be authorized to that identity. Common examples of access control involving authentication include:

* Withdrawing cash from an ATM.
* Logging in to a computer
* Using an Internet banking system.
* Entering a country with a passport
* Using a confirmation email to verify ownership of an e-mail address
* A computer program using a blind credential to authenticate to another program
* A captcha is a means of asserting that a user is a human being and not a computer program.

In some cases, ease of access is balanced against the strictness of access checks. For example, the credit card network does not require a personal identification number, and small transactions usually do not even require a signature. The security of the system is maintained by limiting distribution of credit card numbers, and by the threat of punishment for fraud.

Security experts argue that it is impossible to prove the identity of a computer user with absolute certainty. It is only possible to apply one or more tests which, if passed, have been previously declared to be sufficient to proceed. The problem is to determine which tests are sufficient, and many such are inadequate. Any given test can be spoofed one way or another, with varying degrees of difficulty.


ee also

* Athens access and identity management
* Authentication OSID
* Authorization
* Biometrics
* Chip Authentication Program
* Closed-loop authentication
* Diameter (protocol)
* Digital Identity
* Encrypted key exchange (EKE)
* Fingerprint Verification Competition
* Geo-location
* Java Authentication and Authorization Service
* Kerberos
* Needham-Schroeder protocol
* OpenID – an authentication method for the web
* Point of Access for Providers of Information - the PAPI protocol
* Public key cryptography
* Recognition of human individuals
* Secret sharing
* Secure Shell
* Secure remote password protocol (SRP)
* TCP Wrapper
* Two-factor / strong authentication


External links

* [ PHP full implementation (LGPL) of a token grid authentication] .
* [ Password Management Best Practices] .
* [ Password Policy Guidelines] .
* [ General Information on Enterprise Authentication] .
* [ Advanced Authentication Solutions as an alternative] .
* [ "Fourth-Factor Authentication: Somebody You Know"] or [ episode 94,related on it - on SecurityNow] .
* ISBN 038726194X - "Biometric User Authentication for IT Security: Vielhauer, Claus 2005".
* [ At the Core of Authentication] .

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