Cryptology ePrint Archive: Report 2006/034

Direct Chosen-Ciphertext Secure Identity-Based Key Encapsulation without Random Oracles

Eike Kiltz and David Galindo

Abstract: We describe a new and practical identity-based key encapsulation mechanism that is secure in the standard model against chosen-ciphertext (CCA2) attacks. Since our construction is direct and not based on hierarchical identity-based encryption, it is more efficient than all previously proposed schemes. Furthermore, we give the first chosen-ciphertext secure identity-based key encapsulation mechanism with threshold key delegation and decryption in the standard model.

Category / Keywords: public-key cryptography / identity-based encryption, IBE, threshold cryptography

Publication Info: ACISP 2006 and SCN 2006

Date: received 31 Jan 2006, last revised 4 Aug 2006

Contact author: kiltz at cwi nl

Available format(s): PDF | BibTeX Citation

Version: 20060804:081040 (All versions of this report)

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