Cryptology ePrint Archive: Report 2007/422

Structural Identity-Based Encryption

Man Ho Au and Siu-Ming Yiu

Abstract: In this paper, we introduce the concept of structural identity-based encryption (SIBE). Similar to hierarchical identity-based encryption (HIBE), entities in the system are organized into hierarchy. An entity in SIBE can decrypt ciphertext for all its ancestors. It can be seen as an opposite of HIBE, where an entity can decrypt the ciphertext for all its descendants.

We formalize the notion and security requirements, propose an efficient construction and show that our construction is secure under appropriate assumptions in the random oracle model.

Category / Keywords: public-key cryptography / HIBE, SIBE

Date: received 10 Nov 2007

Contact author: mhaa456 at uow edu au

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Version: 20071118:221900 (All versions of this report)

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