Anonymity 2.0: X.509 Extensions Supporting Privacy-Friendly Authentication
V. Benjumea, S.G. Choi, J. Lopez, and M. Yung.
We present a semantic extension to X.509 certificates that allows
incorporating new anonymity signature schemes into the X.509
framework. This fact entails advantages to both components. On the
one hand, anonymous signature schemes benefit from all the protocols
and infrastructure that the X.509 framework provides. On the other
hand, the X.509 framework incorporates anonymity as a very
interesting new feature. This semantic extension is part of a system
that provides user's controlled anonymous authorization under the
X.509 framework. Additionally, the proposal directly fits the much
active Identity 2.0 effort, where anonymity is a major supplementary
feature that increases the self-control of one's identity and
privacy which is at the center of the activity.
Keywords: Anonymous authentication, X.509 certificates, group
signatures, ring signatures, traceable signatures