My research interests include cloud computing, network security, cryptography, distributed computing, design and analysis of algorithms, enabling technologies for e-commerce, privacy protection, and digital right management. Currently, my research is focus on cloud computing and network security.
To achieve both security and efficiency, we develop a user efficient blind signature scheme for digital cash and electronic voting services. By adopting this scheme, only several modular multiplications are required for a user to obtain and verify a digital signature, a digital cash, or an electronic vote. Compared with the blind signature schemes in the literatures, the computation overheads of users are greatly reduced by mire than 99% in our scheme. Furthermore, the proposed method not only copes with the unlimited growth problem of the network banks' databases but also resolves the possible misuse problem of the unlinkability property such as to launder money or to safely get a ransom. In addition, different payment mechanisms are needed for different types of transactions, we design several advanced digital cash services such as information attachable digital cash, divisible electronic cash, and anonymous rewarding services. By using these techniques, clients can obtain efficient and diversified financial services from the servers.