Léonard Dallot Towards a Concrete Security Proof of Courtois, Finiasz and Sendrier Signature Scheme. 65-77 2007 WEWoRC http://dx.doi.org/10.1007/978-3-540-88353-1_6 conf/weworc/2007 db/conf/weworc/weworc2007.html#Dallot07