Yutaka Kawai Kazuki Yoneyama Kazuo Ohta Secret Handshake: Strong Anonymity Definition and Construction. 219-229 2009 ISPEC http://dx.doi.org/10.1007/978-3-642-00843-6_20 conf/ispec/2009 db/conf/ispec/ispec2009.html#KawaiYO09