“The goal of ABC4Trust
is to address the federation and interchangeability of technologies that
support trustworthy yet privacy-preserving Attribute-based Credentials (ABC).
So far credentials such as digitally signed pieces of personal information or
other information used to authenticate or identify a user where not designed to
respect the users privacy. They invariably reveal the identity of the holder
even though the application at hand often needs much less information, for
instance only confirmation that the holder is a teenager or is eligible for
social benefits. In contrast to that, Attribute-based Credentials allow a
holder to reveal just the minimal information required by the application,
without giving away full identity information
. These credentials thus
facilitate the implementation of a trustworthy and at the same time
privacy-protecting digital society.”


“1st Pilot – Privacy
in Online Evaluation and Feedback Systems

Deployment: Patras University, Greece
Scenario: Students evaluate anonymously the courses
they attended

2nd Pilot – Privacy
in social communication fora

Deployment: Söderhamn Secondary School, Sweden
Scenario: Pupils communicate using pseudonyms on
the school communication system

Benefits of

– Privacy-ABCs are by default untraceable (no
– Enable minimal disclosure (user reveals only the
necessary information)
– User can chose to stay anonymous or generate
(unlimited number of) pseudonyms
– Advanced security (no sharing of credentials,
device-binding for extra protection)

implementation with ABC functionality

– Coded in the ABC-Engine
– Exposed to the application layer as web-services
– As open source.

For developers

– Easier application development
– Cryptographic operations are abstracted away from.

For users

– Only need to install a browser plug-in”

More information:

Telekom Chair of Mobile Business & Multilateral Security

University Frankfurt