Towards Role Based Trust Management without Distributed Searching of Credentials
Trust management systems enable decentralized authorization by searching distributed credentials from network. We argue that such distributed searching processes may encounter many technical or non-technical problems, and can be avoided by storing delegation credentials redundantly with acceptable costs. We propose a scoped-role based trust management system ScoRT, using a novel credential affiliation model to compute the credentials necessary for role membership decisions, which can be used to guide the storage, retrieval and revocation of credentials. The algorithm for distributed credential storage and retrieval is designed based on the model and its sound and complete properties are formally analyzed with respect to ScoRT semantics. Complexity analysis and estimation show that, by redundantly storing acceptable amount of delegation credentials, ScoRT enables more practical and automatic authorization without searching credentials from remote entities, and thus helps to overcome the deficiencies of existing approaches.
Unable to display preview. Download preview PDF.
- 2.Becker, M.Y., Sewell, P.: Cassandra: Flexible Trust Management, Applied to Electronic Health Records. In: Proceedings of the 17th IEEE Computer Security Foundations Workshop (2004)Google Scholar
- 3.Becker, M.Y.: A formal security policy for an NHS electronic health record service. UCAM-CL-TR 628, University of Cambridge, Computer Laboratory, p. 81 (March 2005)Google Scholar
- 4.Becker, M.Y., Fournet, C., Gordon, A.D.: Design and Semantics of a Decentralized Authorization Language. In: 20th IEEE Computer Security Foundations Symposium, pp. 3–15 (2007)Google Scholar
- 7.Blaze, M., Feigenbaum, J., Ioannidis, J., Keromytis, A.D.: The KeyNote trust-management system, version 2. IETF RFC 2704 (September 1999) Google Scholar
- 9.Elley, Y., Anderson, A., Hanna, S., Mullan, S., Perlman, R., Proctor, S.: Building certification paths: Forward vs. reverse. In: Proceedings of the 2001 Network and Distributed System Security Symposium (NDSS 2001), pp. 153–160. Internet Society (February 2001)Google Scholar
- 10.Ellison, C., Frantz, B., Lampson, B., Rivest, R., Thomas, B., Ylonen, T.: SPKI certificate theory. IETF RFC 2693 (September 1999)Google Scholar
- 11.Farrell, S., Housley, R.: An Internet Attribute Certificate Profile for Authorization, RFC3281 (April 2002)Google Scholar
- 13.Hasu, T., Kortesniemi, Y.: Implementing an SPKI Certificate Repository within the DNS. In: International Workshop on Public-Key Cryptography, PKC (2000)Google Scholar
- 14.Jim, T.: SD3: A trust management system with certified evaluation. In: Proceedings of the 2001 IEEE Symposium on Security and Privacy, pp. 106–115. IEEE Computer Society Press, Los Alamitos (2001)Google Scholar
- 15.Li, N.: Delegation Logic: A Logic-based Approach to Distributed Authorization. PhD thesis, New York University, New York (2000)Google Scholar
- 16.Li, N., Winsborough, W.H., Mitchell, J.C.: Distributed credential chain discovery in trust management (extended abstract). In: Proceedings of the Eighth ACM Conference on Computer and Communications Security (CCS-8), pp. 156–165. ACM Press, New York (2001)Google Scholar
- 17.Li, N., Mitchell, J.C., Winsborough, W.H.: Design of a role-based trust management framework. In: Proceedings of the 2002 IEEE Symposium on Security and Privacy, pp. 114–130. IEEE Computer Society Press, Los Alamitos (2002)Google Scholar