Licheng Wang Zhenfu Cao Shihui Zheng Xiaofang Huang Yixian Yang Transitive Signatures from Braid Groups. 183-196 2007 conf/indocrypt/2007 INDOCRYPT http://dx.doi.org/10.1007/978-3-540-77026-8_14 db/conf/indocrypt/indocrypt2007.html#WangCZHY07