Amitanand S. Aiyer Lorenzo Alvisi Rida A. Bazzi Allen Clement Matrix Signatures: From MACs to Digital Signatures in Distributed Systems. 16-31 2008 DISC http://dx.doi.org/10.1007/978-3-540-87779-0_2 conf/wdag/2008 db/conf/wdag/disc2008.html#AiyerABC08