Miklós AjtaiCynthia Dwork A Public-Key Cryptosystem with Worst-Case/Average-Case Equivalence Electronic Colloquium on Computational Complexity (ECCC) 1996 65 3 db/journals/eccc/eccc3.html#ECCC-TR96-065 http://eccc.hpi-web.de/eccc-reports/1996/TR96-065/index.html