Privacy Preserving Second-Price Sealed Bid Auction System. The system is finished based on fasterGC system, you can find fasterGC in http://www.mightbeevil.org/framework/ and https://github.com/uvasrg/FastGC. The core technology of the system are Secure Multi-Party Computation and Homomorphic Encryption. I learned them from my teacher, Li Lu, who comes from University of Science and Technology of China, PhD of infomation secure .