Collusion Resistant Anonymous Broadcast Encryption Scheme based on PUF
             Lukasz Krzywiecki and Miroslaw Kutylowski
                  Wroclaw University of Technology


In the paper we describe a broadcast encryption system with a  revocation protocol,  
where security is based not on  cryptographic hardness of some algebraic problem, 
but on PUF (Physical Unclonable Function). 

The advantage of our scheme is that it is immune to advances of cryptography 
(which may suddenly ruin any system depending solely of cryptographic assumptions). 
It is resilient to collusion attacks, which are often in practice the Achilles' heel 
of schemes based on cryptography. It provides a high level of privacy protection 
of the users. On the downside, it requires memory cards  as well as time consuming 
initialization of PUFs. 

Security of the scheme is based on the assumption of randomness of PUF's output 
and their unclonability (or a high cost of manufacturing  clones). 


accepted for TRUST'2011, Pittsburgh
to appear in LNCS