Ihave performed single-factorauthenticationinthischapter, whichis where the user is able to authenticateusingasinglepieceofinformation known to them in advance: the password.
If businesses choose, they can opt for single-factor authentication, though two-factor security is also an option -- as unique as the veins in your palm are, it's still possible for the reader to register a false positive.
It did so by offering single sign-on, knowledge-based and multi-factor authentication options, which ensure that the right person signs the right document consistently.