Miaomiao Zhang Gongliang Chen Jianhua Li Efficient ID-based Proxy Chameleon Signature from Bilinear Pairings. 135-141 2006 conf/imsccs/2006-2 IMSCCS (2) http://doi.ieeecomputersociety.org/10.1109/IMSCCS.2006.218 db/conf/imsccs/imsccs2006-2.html#ZhangCL06