You would have to bring with you many different
devices (the so-called necklace effect) for the numerous
services you are a customer of, all requiring slightly or signi?¬?-
cantly different usage and all with different software (drivers and
protocols) and hardware (readers, ports) dependencies. Unless a
dominant model emerges or a further standardization takes
place, the preceding scenario sounds a bit too taxing on users
and resources to be likely.
Issued Token??“Based Authentication Schemes
Passwords stand up to certi?¬?cate-based authentication schemes
like a bicycle stands up to a heavily armored tank. The latter is
much more secure, and you can certainly imagine situations in
which you would not want to go around with anything less, but
it requires such an expensive infrastructure that driving everywhere
with it is not really an option.
70 The Problem
Certi?¬?cates are great for handling the identity of resources such
as services and websites. Those are fairly static entities accessed
by many users; they typically stay online for periods that can be
measured in months or years; they have somebody behind them
who is motivated to pour money into their maintenance.
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