The case is described in his publication titled "Attack on Fully Homomorphic Encryption over the Integers".
Hi, the attack described in Chunsheng's paper is applicable to the scheme "Fully Homomorphic Encryption over the Integers" by van Dijk, Gentry, Halevi and Vaikuntanathan as presented in http://eprint.iacr.org/2009/616.pdf.
This challenge was created using the JCrypTool implementation of the Fully Homomophic Encryption scheme by Gentry and Halevi as given in http://eprint.iacr.org/2010/520.pdf. The attack described in Chunsheng's paper doesn't apply to this scheme, but maybe you can make it applicable? [HTML_REMOVED]