The case is described in his publication titled "Attack on Fully Homomorphic Encryption over the Integers".
http://eprint.iacr.org/2012/157.pdf
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]