Ivan Damgård Jesper Buus Nielsen Daniel Wichs Isolated Proofs of Knowledge and Isolated Zero Knowledge. 509-526 2008 EUROCRYPT http://dx.doi.org/10.1007/978-3-540-78967-3_29 conf/eurocrypt/2008 db/conf/eurocrypt/eurocrypt2008.html#DamgardNW08