Cryptology ePrint Archive: Report 2005/217

Efficient Identity-Based Key Encapsulation to Multiple Parties

M. Barbosa and P. Farshim

Abstract: We introduce the concept of identity based key encapsulation to multiple parties (mID-KEM), and define a security model for it. This concept is the identity based analogue of public key KEM to multiple parties. We also analyse possible mID-KEM constructions, and propose an efficient scheme based on bilinear pairings. We prove our scheme secure in the random oracle model under the Gap Bilinear Diffie-Hellman assumption.

Category / Keywords: public-key cryptography / Key Encapsulation Mechanism (KEM), Hybrid Encryption, Identity Based Cryptography, Pairing Based Cryptography

Date: received 5 Jul 2005, last revised 5 Jan 2006

Contact author: farshim at cs bris ac uk

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Version: 20060105:122715 (All versions of this report)

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