The Trusted Digital Technology (TDT) lab of Shanghai Jiao Tong University was founded by Professor Zhenfu Cao in January 2002. It is one of the earliest labs publicly working on the "trusted-X technology" all over the world. It focuses on the research of cryptology and trusted digital technology. In Cryptography, the research topics include modern cryptographic algorithms, cryptanalysis, digital signatures, threshold algorithms, secret key managing, secret sharing, cryptographic protocols and so on. In trusted digital technology, the research topics include trusted computing, trusted network, security issues in E-Commerce and E-Government, the security form in the information/network security realm, the Public Key Infrastructure (PKI) and how to downplay the PKI and so on. The lab own independent intellectual property rights in the core technologies. Meanwhile, the Lab is working hard to promote the transformation from research and development into products and achieve the key technology on information security design, such as identity (biometric) based public key authentication framework.

Since it was established, the Trusted Digital Technology lab has already applied for 22 national patents (20 published) and 6 international/U.S. patents. TDT has developed the first encrypted data sharing mobile device. TDT has also developed the algorithms for huge integer computing, huge integer decomposing, elliptic curve computing. Since established, the Trusted Digital Technology lab has published over 200 papers on the renowned domestic and foreign academic journals and conferences. More than 90 papers were retrieved by SCI, more than 140 papers were retrieved by EI. Currently, there are 4 professors and associate professors, 3 guest professors and guest staffs, 11 doctors, 14 masters, several engineering masters and several students of ACM honor class. 2 post-doctors, 14 doctors, 29 masters and several engineering masters have graduated from TDT lab. It has done an excellent job on more than 10 important research projects, such as Outstanding Youth Science Foundation of China. Now, the lab is in charge of the research on National Natural Science Foundation of China, National 863 project, Research Fund for the Doctoral Program of Higher Education and Special Foundation of Huawei.

The lab has built up a long term relationship with many related international institutes. The lab aims to build and cultivate an international top-level research group, and become one of the most important research institutes in the world.