Ad-Hoc-Domain Signatures for Personal eID Documents 
                     K.Kluczniak, L.Hanzlik, M.Kutylowski
                     
                           Politechnika Wroclawska
                           
We consider the domain signature concept --a powerful tool to realize ``privacy-by-design'' 
during authentication with personal identity cards.  

We expand the ideas proposed by   German Federal Office for Information Security (BSI). 
We provide a solid   formal model for  unlinkability alluding the problems of previous 
definitions. We present a concrete scheme satisfying all required security and privacy properties, 
in particular solving the  seclusiveness problem of  the protocol included in 
the BSI Technical Guideline. 

Another novelty is enabling ad hoc creation of domains - without no need of domain registration
and creating certificates. This improves flexibility and should significantly reduce 
implementation costs. 

TO BE PRESENTED AT: ARTICCRYPT 2016