1. Bouncy Castle Crypto APIs, http://www.bouncycastle.org/
2. Development tools, http://www.forum.nokia.com/main/resources/tools_and_sdks/carbide/index.html
3. Bhargav-Spantzel, A., Woo, J., Bertino, E.: Receipt management- transaction history based trust establishment. In: Proceedings of the 2007 ACM workshop on Digital identity management, New York, NY, USA, pp. 82–91 (2007)
4. Bhargav-Spantzel, A., Squicciarini, A.C., Xue, R., Bertino, E.: Practical Identity Theft Prevention using Aggregated Proof of Knowledge, Technical report CERIAS TR 2006-26 (2006)
5. Lecture Notes in Computer Science;J. Boly,1994