Authentication is the process of verifying the identity of a person or device.

For example by entering a username and password when you log in to a website. Entering the correct login information lets the website know
 1) Who you are and
 2) That it is actually you accessing the website.

Authentication begins when a user tries to access information. First, the user must prove his access rights and identity.

When logging into a computer, users commonly enter usernames and passwords for authentication purposes. This login combination, which must be assigned to each user, authenticates access.


Single-factor authentication
Two-factor authentication
Multi-factor authentication
Strong authentication
Continuous Authentication


Single-factor authentication:

The use of single factor does not offer much protection from misuse or malicious intrusion. This type of authentication is not recommended for financial or personally relevant transactions that warrant a higher level of security.

Two-factor authentication:

Two-factor authentication (also "2FA") typically requires a correct login plus another verification check. For example, if you enable 2FA for your online bank account, you may be required to enter a temporary code sent to your phone or email address to complete the login process.

This ensures that only you (or someone with access to your phone or email account) can access your account, even after entering the correct login information.

Multi-factor authentication:

Multi-factor authentication (MFA) is an authentication method in which a computer user is granted access only after successfully presenting two or more pieces of evidence (or factors) to an authentication mechanism.

Strong authentication:

Strong authentication has been defined by regulation and incoming legislation within the payment zone for remote payment transactions. Strong authentication and strong customer authentication are used interchangeably in banking and financial services, particularly where access to an account must be linked to an actual person, corporation or trust.

It is typically considered to require at least two forms of verification, selected from secrets a user knows, devices or tokens a user owns, and biometric information connected to what/who a user is.

Continuous Authentication:

Conventional computer systems authenticate users only at the initial log-in session, which can be the cause of a critical security flaw. To resolve this problem, systems need continuous user authentication methods that continuously monitor and authenticate users based on some biometric trait(s). A study used behavioural biometrics based in writing styles as a continuous authentication method.

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