Koichi Shimizu Daisuke Suzuki Toyohiro Tsurumaru High-Speed Search System for PGP Passphrases. 332-348 2008 CANS http://dx.doi.org/10.1007/978-3-540-89641-8_24 conf/cans/2008 db/conf/cans/cans2008.html#ShimizuST08