Although services providers are a very important part of the
equation, they are not the entire story. User acceptance makes
for the success or the failure of many online services. Systems
have to walk a thin line between ease of use and security assurances
offered; context information considerations, such as how
private is the data being exchanged at the moment, are powerful
in?¬‚uencing factors for pulling opinions on one side or the other
of that line. We have seen in Chapter 1, in the sections
???Passwords: Ascent and Decline??? and ???The Babel of Web User
Interfaces,??? how users have trained to cope with inef?¬?cient and
insecure systems. The consequences of those shortcomings are
often felt at moments apparently unrelated to the authentication
experience, such as when you spot an unauthorized purchase
days after the last home-banking transaction. Hence, the user is
not always able to recognize the causal link between aspects of
a bad authentication system and the issues it causes. Add this to
the dif?¬?culty the user has when trying to ?¬?gure out what is going
on during a transaction (such as whether the website rendered
in the browser is truly the intended one).
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