Alexandra Boldyreva Craig Gentry Adam O'Neill Dae Hyun Yum Ordered multisignatures and identity-based sequential aggregate signatures, with applications to secure routing. 276-285 2007 ACM Conference on Computer and Communications Security http://doi.acm.org/10.1145/1315245.1315280 conf/ccs/2007 db/conf/ccs/ccs2007.html#BoldyrevaGOY07