Mihir Bellare Adriana Palacio Protecting against key-exposure: strongly key-insulated encryption with optimal threshold. 379-396 2006 16 Appl. Algebra Eng. Commun. Comput. 6 http://dx.doi.org/10.1007/s00200-005-0183-y db/journals/aaecc/aaecc16.html#BellareP06