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Security measure designed to protect a communications system against fraudulent transmissions and establish the authenticity of a message.


The verification of the identity of a person or process. In a communication system, authentication verifies that messages really come from their stated source, like the signature on a (paper) letter. The most common form of authentication is typing a user name (which may be widely known or easily guessable) and a corresponding password that is presumed to be known only to the individual being authenticated. Another form of authentication is biometrics.


(1) Verifying the integrity of a transmitted message. See message integrity, e-mail authentication and MAC.

(2) Verifying the identity of a user logging into a network. Passwords, digital certificates, smart cards and biometrics can be used to prove the identity of the client to the network. Passwords and digital certificates can also be used to identify the network to the client. The latter is important in wireless networks to ensure that the desired network is being accessed. See identity management, identity metasystem, OpenID, human authentication, challenge/response, two-factor authentication, password, digital signature, IP spoofing, biometrics and CAPTCHA.

Four Levels of Proof

There are four levels of proof that people are indeed who they say they are. None of them are entirely foolproof, but in order of least to most secure, they are:

1 - What You Know
Passwords are widely used to identify a user, but only verify that somebody knows the password.

2 - What You Have
Digital certificates in the user's computer add more security than a password, and smart cards verify that users have a physical token in their possession, but both laptops and smart cards can be stolen.

3 - What You Are
Biometrics such as fingerprints and iris recognition are more difficult to forge, but you have seen such systems fooled in the movies all the time!

4 - What You Do
Dynamic biometrics such as hand writing a signature and voice recognition are the most secure; however, replay attacks can fool the system.
References in periodicals archive ?
In Section 4, the latest technical solutions are reviewed in detail, including Digital Rights Management (DRM), confidentiality protection, ownership protection, traitor tracing, secure multimedia distribution based on watermarking, forgery detection, copy detection, privacy-preserving data mining, secure user interface, and intrusion detection and prevention.
Forgery detection dates back centuries to the reign of the great Greek and Roman philosophers.
There may also be many counterfeits which evade forgery detection machines in retail and other commercial outlets
She is also a certified handwriting expert, which is limited to forgery detection.
Mitek now has deployed its patented signature forgery detection technology into three markets: Financial Services, Life Sciences, and Local Government.
Having signed an agreement with a market leader in the UK government election services, Mitek now has deployed its recently announced patented signature forgery detection technology into three key markets: Financial Services, Life Sciences and Local Government.
Yesterday, we announced our second patent for the invention of additional forgery detection capabilities, further reinforcing our leadership in image-based forgery detection.
The Company also announced earlier this month that it has been allowed its first patent for the invention of a 'System and Method for Check Fraud Detection Using Signature Validation', further reinforcing the company's innovative leadership in image-based forgery detection.
This second invention relating to a 'System and Method for Check Fraud Detection Using Signature Validation,' confirms the company's innovative leadership in image-based forgery detection.