Peng Yang 0002 Rui Zhang 0002 Kanta Matsuura Hideki Imai Generic Construction of Stateful Identity Based Encryption. 338-346 2009 ISC http://dx.doi.org/10.1007/978-3-642-04474-8_27 conf/isw/2009 db/conf/isw/isc2009.html#YangZMI09