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Several credential systems have been proposed in which users can
authenticate to services anonymously. Since anonymity can give users
the license to misbehave, some variants allow the selective
deanonymization (or linking) of misbehaving users upon a complaint
to a trusted third party (TTP). The ability of the TTP to revoke a
user's privacy at any time, however, is too strong a punishment for
misbehavior. To limit the scope of deanonymization, systems such as
``e-cash'' have been proposed in which users are deanonymized under
only certain types of well-defined misbehavior such as ``double
spending.'' While useful in some applications, it is not possible
to generalize such techniques to more subjective definitions of
We present the first anonymous credential system in which services can ``blacklist'' misbehaving users without contacting a TTP. Since blacklisted users remain anonymous, misbehaviors can be judged subjectively without users fearing arbitrary deanonymization by a TTP.
This technical report is the extended version of the paper to appear in CCS '07 under the same title.
Bibliographic citation for this report: [plain text] [BIB] [BibTeX] [Refer]
Or copy and paste:
Patrick P. Tsang, Man Ho Au, Apu Kapadia, and Sean W. Smith, "Blacklistable Anonymous Credentials: Blocking Misbehaving Users without TTPs (Extended Version)." Dartmouth Computer Science Technical Report TR2007-601, September 2007.
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