Before revision: Authentication factors There are three generally accepted factors that are used to establish a digital identity for electronic authentication, including: Knowledge factor, which is something that the user knows, such as a password, answers to challenge questions, ID numbers or a PIN.
After revision: 2Authentication factors There are three generally accepted factors that are used to establish a digital identity for electronic authentication, including: Knowledge factor, which is something that the user knows, such as a password, answers to challenge questions, ID numbers or a PIN.