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Varieties Of Authentication

It appears to all come down to binding. All of the above bind a person or machine to a physical trait, a token, a location, an ability, etc. Authentication may also simply be a case of binding one key to another without any explicit connection to people or things. Further, this act of binding may itself be bound to a time, a place, a random challenge value, etc. A preliminary list of questions that naturally arises at this point is the following: