Research On Fair Exchange Protocol And Some Key Techniques Of Mobile Digital Rights Managements

With the development of wireless networks, mobile communication networks have been greatly improved in the operation and performance compared the existing narrow-band GSM and CDMA, which make the variety and rich mobile services possible. However, the digital contents are easy to be forwarded, copied, and tampered. Such features have caused a lot loss of the content providers and obstructed the mobile services'progress greatly. Furthermore, some issues including the fair transaction costs, transaction speed and security in the existing mobile payment restricted the development of mobile digital content business. Therefore, how to effectively protect a secure delivery and fair transaction of digital content becomes an urgent problem. Combined with the current 3G wireless communication networks, this dissertation makes the researches on digital contents security, transaction fairness and service efficiency etc. for the protection and management of mobile digital content rights.Main contributions of this dissertation are summarized as follows:1) A new fair concurrent identity-based signature scheme is proposed for mobile Digital Right Management (DRM) and a new signature scheme is proved to be secure against existential forgery on adaptively chosen message and ID attack under Random Oracle Model. Furthermore, the efficiency analysis and a new attempt to reduce the reliance on the trusted third party (TTP) in fair exchange protocols are provided. These works make a good basis for designing an efficient fair exchange protocol which applies in mobile DRM.2) Researches on the current formal analyzing methods of fair-exchange protocols, the strand space model has been extended on the application of fair exchange protocol analysis and an analytical example is provided to prove the efficiency of this new methods.3) A novel mobile DRM is proposed based on 3G wireless communication networks and it makes much improvement in the security of content distribution and the fairness of the transaction than the existing mobile DRM. At the same time, the new fair concurrent identity-based signature is applied to design a fair payment protocol without the participation of the trusted third party, and it ensures transaction security and payment efficiency in the novel mobile DRM.4) In order to deal with the fair-exchange flaws in the existing trading systems, a digital content trading model is provided based on a new mobile payment scheme. In order to deal with the fair-exchange flaws in the existing trading systems, a new secure mobile payment scheme is provided based on the research of the weakness of the existing mobile payment. The new scheme uses the one-time key distribution method in the transaction to improve the exchange security. Furthermore, considering the fairness of transaction, the new scheme provides message confidentiality, unforgeability, non-repudiation support. And the protocols in the new scheme are formal analyzed by strand space model.5) Taking full account of all roles and the interests of all involved parties, a new digital content trading system is presented. The new mobile payment scheme is used in the new digital content trading system to protect the payment privacy and the security of business.6) Aiming to improve the efficiency of DRM services, this dissertation present a clustering algorithm on the basis of chaotic ant swarm model to manage the massive copyright information in hierarchy way by category. And then manually or automatically by means of inquiry or cognizance in a smaller range, the experiment proves that method will enhance the precision of the right identification and the efficiency of query for DRM.