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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, email 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 ?
These are the certificate of registration with the Securities and Exchange Commission, Cooperative and Development Authority or the Department of Labor and Employment; an authenticated copy of their latest articles of incorporation or articles of cooperation; and audited financial reports for the past three years.
Authenticated copy of confessional statement of Ajmal Qasab recorded by the judicial authorities
European and American fans offer hundreds of pounds for an authenticated copy, and often call upon Jackie Hayden to verify they have an original.
Minister for Inter-Provincial Coordination moved a motion of thanks to express gratitude to the President of Pakistan for his address to the joint session on June 4, 2015 whereas the authenticated copy of President's address was also presented before the House.