Two-factor authentication (2FA) is the simplest, most effective way to make sure users really are who they say they are. But, not every two-factor solution is the same. Some vendors only provide the bare minimum needed to meet compliance requirements – and some carry lots of hidden costs for deployment, operation and maintenance. Plus, many traditional solutions are clunky, error-prone and require extensive user training and support – costing your employees time and productivity. This guide walks through key areas of differentiation between two-factor authentication solutions and provides concrete criteria for evaluating technologies and vendors.