
Most websites use the combination of usernames and passwords. Both are items that a user knows. Asking “what street did I grow up on”, is just asking more things that a user knows, firms that do this are just implementing more KBA’s. Economics of Authentication To use some basic economics, the addition of the password as opposed to not requiring validation has a huge marginal benefit to the company. Implementing a second, and third and forth has an ever decreasing
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