Eiichiro Fujisaki Tatsuaki Okamoto David Pointcheval Jacques Stern RSA-OAEP Is Secure under the RSA Assumption. 81-104 2004 17 J. Cryptology 2 http://dx.doi.org/10.1007/s00145-002-0204-y db/journals/joc/joc17.html#FujisakiOPS04