Yunfa Li Hai Jin Deqing Zou Jieyun Chen Zongfen Han A Digital Signature Mechanism and Authentication Scheme for Group Communication in Grid. 42-51 2007 conf/atc/2007 ATC http://dx.doi.org/10.1007/978-3-540-73547-2_7 db/conf/atc/atc2007.html#LiJZCH07