Abstract
A forward-secure encryption scheme protects secret keys from exposure by evolving the keys with time. Forward security has several unique requirements in hierarchical identity-based encryption (HIBE) scheme: (1) users join dynamically; (2) encryption is joining-time-oblivious; (3) users evolve secret keys autonomously. We present a scalable forward-secure HIBE (fs-HIBE) scheme satisfying the above properties. We also show how our fs-HIBE scheme can be used to construct a forward-secure public-key broadcast encryption scheme, which protects the secrecy of prior transmissions in the broadcast encryption setting. We further generalize fs-HIBE into a collusion-resistant multiple hierarchical ID-based encryption scheme, which can be used for secure communications with entities having multiple roles in role-based access control. The security of our schemes is based on the bilinear Diffie-Hellman assumption in the random oracle model.
| Original language | English (US) |
|---|---|
| Title of host publication | Proceedings of the ACM Conference on Computer and Communications Security |
| Editors | B. Pfitzmann, P. Liu |
| Pages | 354-363 |
| Number of pages | 10 |
| State | Published - 2004 |
| Event | Proceedings of the 11th ACM Conference on Computer and Communications Security, CCS 2004 - Washington, DC, United States Duration: Oct 25 2004 → Oct 29 2004 |
Other
| Other | Proceedings of the 11th ACM Conference on Computer and Communications Security, CCS 2004 |
|---|---|
| Country/Territory | United States |
| City | Washington, DC |
| Period | 10/25/04 → 10/29/04 |
Keywords
- Broadcast Encryption
- Forward security
- ID-Based Encryption
ASJC Scopus subject areas
- General Computer Science