Alexander May Maike Ritzenhofen Solving Systems of Modular Equations in One Variable: How Many RSA-Encrypted Messages Does Eve Need to Know? 37-46 2008 Public Key Cryptography http://dx.doi.org/10.1007/978-3-540-78440-1_3 conf/pkc/2008 db/conf/pkc/pkc2008.html#MayR08