Guilhem Castagnos Fabien Laguillaumie On the Security of Cryptosystems with Quadratic Decryption: The Nicest Cryptanalysis. 260-277 2009 EUROCRYPT http://dx.doi.org/10.1007/978-3-642-01001-9_15 conf/eurocrypt/2009 db/conf/eurocrypt/eurocrypt2009.html#CastagnosL09