In authentication, a factor is a piece of information used to verify a person's identity. Authentication (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. ...
'Something you are', such as a fingerprint, a retinal pattern, or other biometric.
Other, less common factors may include: A password is a form of secret authentication data that is used to control access to a resource. ... A personal identification number (PIN) is a numeric value (sometimes expressed as text using the standard telephone dial mapping) that is used in certain systems to gain access, and authenticate. ... Credit cards A credit card system is a type of retail transaction settlement and credit system, named after the small plastic card issued to users of the system. ... yhgjkjlklk--24. ... The Retinenes (Retinene1 and Retinene2) are chemical derivatives of the dietary supplement vitamin A (see retinol) formed through oxidation reactions. ... To meet Wikipedias quality standards, this article or section may require cleanup. ...
Cybermetric authentication, such as only allowing access from the certain computer, which is the combination of unique hardware and (or) software installed
Location-based authentication, such as only allowing a particular atm, charge, or credit card to be used at a specific merchant or at a specific bank branch, or only allowing root access from specific terminals
Time-based authentication, such as only allowing access from certain accounts during normal working hours
Size-based authorization, such as only allowing a specific transaction to be for a specific exact amount
Pre-authorized transactions, such as where a company uploads all of the check numbers and amounts written for each check to their bank, and the bank would then reject any check not of those numbers and amounts as fraudulent
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