Personal website of Zhenfei Zhang

The LAC cryptosystem that I co-designed has entered the 2nd round of post-quantum cryptography competition, hosted by Chinese Association for Cryptologic Research.

pqNTRUSign is a lattice based, same-key aggregatable signature scheme. After three years of revision, during which period, the scheme has been submitted to, and rejected by, NIST PQC standardization process, the pqNTRUSign paper is finally accepted for publication by Design, Codes and Cryptography. In this paper, we finally come up with a proof for the existential unforgeablity of the signature, based on the short integer solution (SIS) problems over certain structured lattices.

I just gave a talk at NIST’s second PQC Standardization Conference today on recent updates of the LAC cryptosystem that collegues and I are working on. The slides can be found here and here.

My paper with Shi Bai, Katharina Boudgoust, Dipayan Das, Adeline Roux-Langlois and Weiqiang Wen, Middle-Product Learning with Rounding Problem and its Applications, was accepted by Asiacript 2019! Here is the manuscript.

Internet-draft for bls sigantures is now officially a Candidate RG Document of Crypto Forum Research Group