Research On Anonymous Fingerprinting And Application To Anonymity Technology

Information security is one of the most important problems in modern information society and becomes a new important subject in the information science. With the rapid development of Internet technology, E-commerce, E-governance and other activities in Internet increase quickly. How to protect the security of all kinds of users in Internet becomes an important field, which could affect the modern network technology.In this thesis, we mainly discuss the application of anonymous technology in protection users'privacy, the important is analysis of digital anonymous fingerprinting and research on new scheme. Meanwhile we give a primary discussion on proxy signature of protecting proxy signer's privacy, and propose some improved schemes. The main contributions are as follows.1. The present anonymous digital fingerprinting schemes require a trusted third party taking part in, which makes the identity of buyer leaked out. Based on the premise of security, a new anonymous fingerprinting scheme using the thoughts of Ring Signature is presented, which does not a trusted third party participate in and its security analysis is given.2. K.Shum and V.K.Wei proposed a proxy signature scheme with proxy signer privacy protection, but this scheme is not strong unforgeablity property, and a dishonest original signer can forge the proxy signer to sign on any message. We introduce two new schemes by Knowledge Signature based discrete logarithm and Ring Signature, which possess more security properties.