Sebastian Pape discusses two different scenarios for
authentication. On the one hand, users cannot trust their devices
and nevertheless want to be able to do secure authentication. On
the other hand, users may not want to be tracked while their
service provider does not want them to share their credentials.
Many users may not be able to determine whether their device is
trustworthy, i.e. it might contain malware. One solution is to use
visual cryptography for authentication. The author generalizes this
concept to human decipherable encryption schemes and establishes a
relationship to CAPTCHAS. He proposes a new security model and
presents the first visual encryption scheme which makes use of
noise to complicate the adversary's task. To prevent service
providers from keeping their users under surveillance, anonymous
credentials may be used. However, sometimes it is desirable to
prevent the users from sharing their credentials. The author
compares existing approaches based on non-transferable anonymous
credentials and proposes an approach which combines biometrics and
smartcards.
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