Yanbin Qian Xingyuan Chen Xuehui Du Hongqi Zhang Layered Secure Access Research for Space Network. 307-311 2008 ISCSCT (1) http://doi.ieeecomputersociety.org/10.1109/ISCSCT.2008.115 conf/iscsct/2008 db/conf/iscsct/iscsct2008-1.html#QianCDZ08