Lei Shi Shenghui Su Zhengrong Xiang Design of a Passport Anti-forgery System Based on Digital Signature Schemes. 101-111 2009 PAISI http://dx.doi.org/10.1007/978-3-642-01393-5_11 conf/paisi/2009 db/conf/paisi/paisi2009.html#ShiSX09